{"id":2535,"date":"2013-03-11T19:19:40","date_gmt":"2013-03-11T11:19:40","guid":{"rendered":"https:\/\/kyle.ai\/blog\/?p=2535"},"modified":"2013-11-21T18:21:32","modified_gmt":"2013-11-21T10:21:32","slug":"%e7%bb%8f%e5%85%b8%e8%ae%ba%e6%96%87%e7%bf%bb%e8%af%91%e5%af%bc%e8%af%bb%e4%b9%8b%e3%80%8afinding-a-needle-in-haystack-facebooks-photo-storage%e3%80%8b","status":"publish","type":"post","link":"https:\/\/kyle.ai\/blog\/2535.html","title":{"rendered":"\u7ecf\u5178\u8bba\u6587\u7ffb\u8bd1\u5bfc\u8bfb\u4e4b\u300aFinding a needle in Haystack: Facebook\u2019s photo 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number\uff0c\u53e6\u4e00\u4e2a\u4ece\u78c1\u76d8\u4e0a\u8bfb\u53d6inode\uff0c\u6700\u540e\u4e00\u4e2a\u8bfb\u53d6\u6587\u4ef6\u672c\u8eab\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u4e3a\u4e86\u67e5\u8be2\u5143\u6570\u636e\u4f7f\u7528\u78c1\u76d8I\/O\u662f\u9650\u5236\u541e\u5410\u91cf\u7684\u91cd\u8981\u56e0\u7d20\u3002\u5728\u5b9e\u9645\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u5fc5\u987b\u4f9d\u8d56\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff08CDN\uff0c\u6bd4\u5982Akamai\uff09\u6765\u652f\u6491\u4e3b\u8981\u7684\u8bfb\u53d6\u6d41\u91cf\uff0c\u5373\u4f7f\u5982\u6b64\uff0c\u6587\u4ef6\u5143\u6570\u636e\u7684\u5927\u5c0f\u548cI\/O\u540c\u6837\u5bf9\u6574\u4f53\u7cfb\u7edf\u6709\u5f88\u5927\u5f71\u54cd\u3002<\/p>\n<p>\u4e86\u89e3\u4f20\u7edf\u9014\u5f84\u7684\u7f3a\u70b9\u540e\uff0c\u6211\u4eec\u8bbe\u8ba1\u4e86Haystack\u6765\u8fbe\u52304\u4e2a\u4e3b\u8981\u76ee\u6807\uff1a<\/p>\n<ul>\n<li>\u9ad8\u541e\u5410\u91cf\u548c\u4f4e\u5ef6\u8fdf\u3002\u6211\u4eec\u7684\u56fe\u7247\u5b58\u50a8\u7cfb\u7edf\u5fc5\u987b\u8ddf\u5f97\u4e0a\u6d77\u91cf\u7528\u6237\u67e5\u8be2\u8bf7\u6c42\u3002\u8d85\u8fc7\u5904\u7406\u5bb9\u91cf\u4e0a\u9650\u7684\u8bf7\u6c42\uff0c\u8981\u4e48\u88ab\u5ffd\u7565\uff08\u5bf9\u7528\u6237\u4f53\u9a8c\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\uff09\uff0c\u8981\u4e48\u88abCDN\u5904\u7406\uff08\u6210\u672c\u6602\u8d35\u800c\u4e14\u53ef\u80fd\u906d\u9047\u4e00\u4e2a\u6027\u4ef7\u6bd4\u8f6c\u6298\u70b9\uff09\u3002\u60f3\u8981\u7528\u6237\u4f53\u9a8c\u597d\uff0c\u56fe\u7247\u67e5\u8be2\u5fc5\u987b\u5feb\u901f\u3002Haystack\u5e0c\u671b\u6bcf\u4e2a\u8bfb\u64cd\u4f5c\u81f3\u591a\u9700\u8981\u4e00\u4e2a\u78c1\u76d8\u64cd\u4f5c\uff0c\u57fa\u4e8e\u6b64\u624d\u80fd\u8fbe\u5230\u9ad8\u541e\u5410\u91cf\u548c\u4f4e\u5ef6\u8fdf\u3002\u4e3a\u4e86\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u6807\uff0c\u6211\u4eec\u7aed\u5c3d\u5168\u529b\u7684\u51cf\u5c11\u6bcf\u4e2a\u56fe\u7247\u7684\u5fc5\u9700\u5143\u6570\u636e\uff0c\u7136\u540e\u5c06\u6240\u6709\u7684\u5143\u6570\u636e\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\u3002<\/li>\n<li>\u00a0\u5bb9\u9519\u3002\u5728\u5927\u89c4\u6a21\u7cfb\u7edf\u4e2d\uff0c\u6545\u969c\u6bcf\u5929\u90fd\u4f1a\u53d1\u751f\u3002\u5c3d\u7ba1\u670d\u52a1\u5668\u5d29\u6e83\u548c\u786c\u76d8\u6545\u969c\u662f\u4e0d\u53ef\u907f\u514d\u7684\uff0c\u4e5f\u7edd\u4e0d\u53ef\u4ee5\u7ed9\u7528\u6237\u8fd4\u56de\u4e00\u4e2aerror\uff0c\u54ea\u6015\u6574\u4e2a\u6570\u636e\u4e2d\u5fc3\u90fd\u505c\u7535\uff0c\u54ea\u6015\u4e00\u4e2a\u8de8\u56fd\u7f51\u7edc\u65ad\u5f00\u3002\u6240\u4ee5\uff0cHaystack\u590d\u5236\u6bcf\u5f20\u56fe\u7247\u5230\u5730\u7406\u9694\u79bb\u7684\u591a\u4e2a\u5730\u70b9\uff0c\u4e00\u53f0\u673a\u5668\u5012\u4e0b\u4e86\uff0c\u591a\u53f0\u673a\u5668\u4f1a\u66ff\u8865\u4e0a\u6765\u3002<\/li>\n<li>\u00a0\u9ad8\u6027\u4ef7\u6bd4\u3002Haystack\u6bd4\u6211\u4eec\u4e4b\u524d\uff08NAS+NFS\uff09\u65b9\u6848\u6027\u80fd\u66f4\u597d\uff0c\u800c\u4e14\u66f4\u7701\u94b1\u3002\u6211\u4eec\u6309\u4e24\u4e2a\u7ef4\u5ea6\u6765\u8861\u91cf\uff1a\u6bcfTB\u53ef\u7528\u5b58\u50a8\u7684\u82b1\u8d39\u3001\u6bcfTB\u53ef\u7528\u5b58\u50a8\u7684\u8bfb\u53d6\u901f\u5ea6\u3002\u76f8\u5bf9NAS\u8bbe\u5907\uff0cHaystack\u6bcf\u4e2a\u53ef\u7528TB\u7701\u4e8628%\u7684\u6210\u672c\uff0c\u6bcf\u79d2\u652f\u6491\u4e86\u8d85\u8fc74\u500d\u7684\u8bfb\u8bf7\u6c42\u3002<\/li>\n<li>\u00a0\u7b80\u5355\u3002\u66ff\u6362Facebook\u7684\u56fe\u7247\u5b58\u50a8\u7cfb\u7edf\u5c31\u50cf\u9ad8\u901f\u516c\u8def\u4e0a\u7ed9\u6c7d\u8f66\u6362\u8f6e\u5b50\uff0c\u6211\u4eec\u65e0\u6cd5\u53bb\u8ffd\u6c42\u5b8c\u7f8e\u7684\u8bbe\u8ba1\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u5b9e\u73b0\u548c\u7ef4\u62a4\u90fd\u975e\u5e38\u8017\u65f6\u8017\u529b\u3002Haystack\u662f\u4e00\u4e2a\u65b0\u7cfb\u7edf\uff0c\u7f3a\u4e4f\u591a\u5e74\u7684\u751f\u4ea7\u73af\u5883\u7ea7\u522b\u7684\u6d4b\u8bd5\u3002\u6211\u4eec\u82b1\u8d39\u4e86\u5f88\u591a\u7684\u6ce8\u610f\u529b\u6765\u4fdd\u6301\u5b83\u7684\u7b80\u5355\uff0c\u6240\u4ee5\u6784\u5efa\u548c\u90e8\u7f72\u4e00\u4e2a\u53ef\u5de5\u4f5c\u7684Haystack\u53ea\u82b1\u4e86\u51e0\u4e2a\u6708\u800c\u4e0d\u662f\u597d\u51e0\u5e74\u3002<\/li>\n<\/ul>\n<p>\u672c\u7bc7\u6587\u7ae03\u4e2a\u4e3b\u8981\u7684\u8d21\u732e\u662f\uff1a<\/p>\n<ul>\n<li>Haystack\uff0c\u4e00\u4e2a\u4e3a\u9ad8\u6548\u5b58\u50a8\u548c\u68c0\u7d22billion\u7ea7\u522b\u56fe\u7247\u800c\u4f18\u5316\u5b9a\u5236\u7684\u5bf9\u8c61\u5b58\u50a8\u7cfb\u7edf\u3002<\/li>\n<li>\u6784\u5efa\u548c\u6269\u5c55\u4e00\u4e2a\u4f4e\u6210\u672c\u3001\u9ad8\u53ef\u9760\u3001\u9ad8\u53ef\u7528\u56fe\u7247\u5b58\u50a8\u7cfb\u7edf\u4e2d\u7684\u7ecf\u9a8c\u6559\u8bad\u3002<\/li>\n<li>\u8bbf\u95eeFacebook\u7167\u7247\u5206\u4eab\u5e94\u7528\u7684\u8bf7\u6c42\u7684\u7279\u5f81\u63cf\u8ff0<\/li>\n<\/ul>\n<p>\u6587\u7ae0\u5269\u4f59\u90e8\u5206\u7ed3\u6784\u5982\u4e0b\u3002\u7ae0\u82822\u9610\u8ff0\u4e86\u80cc\u666f\u3001\u7a81\u51fa\u4e86\u4e4b\u524d\u67b6\u6784\u9047\u5230\u7684\u6311\u6218\u3002\u7ae0\u82823\u63cf\u8ff0\u4e86Haystack\u7684\u8bbe\u8ba1\u548c\u5b9e\u73b0\u3002\u7ae0\u82824\u63cf\u8ff0\u4e86\u5404\u79cd\u56fe\u7247\u8bfb\u5199\u573a\u666f\u4e0b\u7684\u7cfb\u7edf\u8d1f\u8f7d\u7279\u5f81\uff0c\u901a\u8fc7\u5b9e\u9a8c\u6570\u636e\u8bc1\u660eHaystack\u8fbe\u5230\u4e86\u8bbe\u8ba1\u76ee\u6807\u3002\u7ae0\u82825\u662f\u5bf9\u6bd4\u548c\u76f8\u5173\u5de5\u4f5c\uff0c\u4ee5\u53ca\u7ae0\u82826\u7684\u603b\u7ed3\u3002<\/p>\n<h5>2 \u80cc\u666f &amp; \u6211\u7684\u524d\u4efb<\/h5>\n<p>\u5728\u672c\u7ae0\u8282\uff0c\u6211\u4eec\u5c06\u63cf\u8ff0Haystack\u4e4b\u524d\u7684\u67b6\u6784\uff0c\u7a81\u51fa\u5176\u4e3b\u8981\u7684\u7ecf\u9a8c\u6559\u8bad\u3002\u7531\u4e8e\u6587\u7ae0\u5927\u5c0f\u9650\u5236\uff0c\u4e00\u4e9b\u7ec6\u8282\u5c31\u4e0d\u7ec6\u8ff0\u4e86\u3002<\/p>\n<h5>2.1 \u80cc\u666f<\/h5>\n<p>\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e2a\u6982\u89c8\u56fe\uff0c\u5b83\u63cf\u8ff0\u4e86\u901a\u5e38\u7684\u8bbe\u8ba1\u65b9\u6848\uff0cweb\u670d\u52a1\u5668\u3001CDN\u548c\u5b58\u50a8\u7cfb\u7edf\u5982\u4f55\u4ea4\u4e92\u534f\u4f5c\uff0c\u6765\u5b9e\u73b0\u4e00\u4e2a\u70ed\u95e8\u7ad9\u70b9\u7684\u56fe\u7247\u670d\u52a1\u3002\u56fe1\u63cf\u8ff0\u4e86\u4ece\u7528\u6237\u8bbf\u95ee\u5305\u542b\u67d0\u4e2a\u56fe\u7247\u7684\u9875\u9762\u5f00\u59cb\uff0c\u76f4\u5230\u5979\u6700\u7ec8\u4ece\u78c1\u76d8\u7684\u7279\u5b9a\u4f4d\u7f6e\u4e0b\u8f7d\u6b64\u56fe\u7247\u7ed3\u675f\u7684\u5168\u8fc7\u7a0b\u3002\u8bbf\u95ee\u4e00\u4e2a\u9875\u9762\u65f6\uff0c\u7528\u6237\u7684\u6d4f\u89c8\u5668\u9996\u5148\u53d1\u9001HTTP\u8bf7\u6c42\u5230\u4e00\u4e2aweb\u670d\u52a1\u5668\uff0c\u5b83\u8d1f\u8d23\u751f\u6210markup\u4ee5\u4f9b\u6d4f\u89c8\u5668\u6e32\u67d3\u3002\u5bf9\u6bcf\u5f20\u56fe\u7247\uff0cweb\u670d\u52a1\u5668\u4e3a\u5176\u6784\u9020\u4e00\u4e2aURL\uff0c\u5f15\u5bfc\u6d4f\u89c8\u5668\u5728\u6b64\u4f4d\u7f6e\u4e0b\u8f7d\u56fe\u7247\u6570\u636e\u3002\u5bf9\u4e8e\u70ed\u95e8\u7ad9\u70b9\uff0c\u8fd9\u4e2aURL\u901a\u5e38\u6307\u5411\u4e00\u4e2aCDN\u3002\u5982\u679cCDN\u7f13\u5b58\u4e86\u6b64\u56fe\u7247\uff0c\u90a3\u4e48\u5b83\u4f1a\u7acb\u523b\u5c06\u6570\u636e\u56de\u590d\u7ed9\u6d4f\u89c8\u5668\u3002\u5426\u5219\uff0cCDN\u68c0\u67e5URL\uff0cURL\u4e2d\u9700\u8981\u5d4c\u5165\u8db3\u591f\u7684\u4fe1\u606f\u4ee5\u4f9bCDN\u4ece\u672c\u7ad9\u70b9\u7684\u5b58\u50a8\u7cfb\u7edf\u4e2d\u68c0\u7d22\u56fe\u7247\u3002\u62ff\u5230\u56fe\u7247\u540e\uff0cCDN\u66f4\u65b0\u5b83\u7684\u7f13\u5b58\u6570\u636e\u3001\u5c06\u56fe\u7247\u53d1\u9001\u56de\u7528\u6237\u7684\u6d4f\u89c8\u5668\u3002<\/p>\n<h5>2.2 \u57fa\u4e8eNFS\u7684\u8bbe\u8ba1<\/h5>\n<p>\u5728\u6211\u4eec\u6700\u521d\u7684\u8bbe\u8ba1\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u4e00\u4e2a\u57fa\u4e8eNFS\u7684\u65b9\u6848\u3002\u6211\u4eec\u5438\u53d6\u7684\u4e3b\u8981\u6559\u8bad\u662f\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u70ed\u95e8\u7684\u793e\u4ea4\u7f51\u7edc\u7ad9\u70b9\uff0c\u53ea\u6709CDN\u4e0d\u8db3\u4ee5\u4e3a\u56fe\u7247\u670d\u52a1\u63d0\u4f9b\u4e00\u4e2a\u5b9e\u7528\u7684\u89e3\u51b3\u65b9\u6848\u3002\u5bf9\u4e8e\u70ed\u95e8\u56fe\u7247\uff0cCDN\u786e\u5b9e\u5f88\u9ad8\u6548\u2014\u2014\u6bd4\u5982\u4e2a\u4eba\u4fe1\u606f\u56fe\u7247\u548c\u6700\u8fd1\u4e0a\u4f20\u7684\u7167\u7247\u2014\u2014\u4f46\u662f\u4e00\u4e2a\u50cfFacebook\u7684\u793e\u4ea4\u7f51\u7edc\u7ad9\u70b9\uff0c\u4f1a\u4ea7\u751f\u5927\u91cf\u7684\u5bf9\u4e0d\u70ed\u95e8\uff08\u8f83\u8001\uff09\u5185\u5bb9\u7684\u8bf7\u6c42\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3along tail\uff08\u957f\u5c3e\u7406\u8bba\u4e2d\u7684\u540d\u8bcd\uff09\u3002long tail\u7684\u8bf7\u6c42\u4e5f\u5360\u636e\u4e86\u5f88\u5927\u6d41\u91cf\uff0c\u5b83\u4eec\u90fd\u9700\u8981\u8bbf\u95ee\u66f4\u4e0b\u6e38\u7684\u56fe\u7247\u5b58\u50a8\u4e3b\u673a\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u8bf7\u6c42\u5728CDN\u7f13\u5b58\u91cc\u57fa\u672c\u4e0a\u90fd\u4f1a\u547d\u4e2d\u5931\u8d25\u3002\u7f13\u5b58\u6240\u6709\u7684\u56fe\u7247\u662f\u53ef\u4ee5\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u4f46\u8fd9\u4e48\u505a\u4ee3\u4ef7\u592a\u5927\uff0c\u9700\u8981\u6781\u5927\u5bb9\u91cf\u7684\u7f13\u5b58\u3002<\/p>\n<p><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/2.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/2.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/2.jpg\" \/><\/a><\/p>\n<p>\u57fa\u4e8eNFS\u7684\u8bbe\u8ba1\u4e2d\uff0c\u56fe\u7247\u6587\u4ef6\u5b58\u50a8\u5728\u4e00\u7ec4\u5546\u7528NAS\u8bbe\u5907\u4e0a\uff0cNAS\u8bbe\u5907\u7684\u5377\u88abmount\u5230Photo Store Server\u7684NFS\u4e0a\u3002\u56fe2\u5c55\u793a\u4e86\u8fd9\u4e2a\u67b6\u6784\u3002Photo Store Server\u89e3\u6790URL\u5f97\u51fa\u5377\u548c\u5b8c\u6574\u7684\u6587\u4ef6\u8def\u5f84\uff0c\u5728NFS\u4e0a\u8bfb\u53d6\u6570\u636e\uff0c\u7136\u540e\u8fd4\u56de\u7ed3\u679c\u5230CDN\u3002<\/p>\n<p>\u6211\u4eec\u6700\u521d\u5728NFS\u5377\u7684\u6bcf\u4e2a\u76ee\u5f55\u4e0b\u5b58\u50a8\u51e0\u5343\u4e2a\u6587\u4ef6\uff0c\u5bfc\u81f4\u8bfb\u53d6\u6587\u4ef6\u65f6\u4ea7\u751f\u4e86\u8fc7\u591a\u7684\u78c1\u76d8\u64cd\u4f5c\uff0c\u54ea\u6015\u53ea\u662f\u8bfb\u5355\u4e2a\u56fe\u7247\u3002\u7531\u4e8eNAS\u8bbe\u5907\u7ba1\u7406\u76ee\u5f55\u5143\u6570\u636e\u7684\u673a\u5236\uff0c\u653e\u7f6e\u51e0\u5343\u4e2a\u6587\u4ef6\u5728\u4e00\u4e2a\u76ee\u5f55\u662f\u6781\u5176\u4f4e\u6548\u7684\uff0c\u56e0\u4e3a\u76ee\u5f55\u7684blockmap\u592a\u5927\u4e0d\u80fd\u88ab\u8bbe\u5907\u6709\u6548\u7684\u7f13\u5b58\u3002\u56e0\u6b64\u68c0\u7d22\u5355\u4e2a\u56fe\u7247\u90fd\u53ef\u80fd\u9700\u8981\u8d85\u8fc710\u4e2a\u78c1\u76d8\u64cd\u4f5c\u3002\u5728\u51cf\u5c11\u5230\u6bcf\u4e2a\u76ee\u5f55\u4e0b\u51e0\u767e\u4e2a\u56fe\u7247\u540e\uff0c\u7cfb\u7edf\u4ecd\u7136\u5927\u6982\u9700\u89813\u4e2a\u78c1\u76d8\u64cd\u4f5c\u6765\u83b7\u53d6\u4e00\u4e2a\u56fe\u7247\uff1a\u4e00\u4e2a\u8bfb\u53d6\u76ee\u5f55\u5143\u6570\u636e\u5230\u5185\u5b58\u3001\u7b2c\u4e8c\u4e2a\u88c5\u8f7dinode\u5230\u5185\u5b58\u3001\u6700\u540e\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n<p>\u4e3a\u4e86\u7ee7\u7eed\u51cf\u5c11\u78c1\u76d8\u64cd\u4f5c\uff0c\u6211\u4eec\u8ba9\u56fe\u7247\u5b58\u50a8\u670d\u52a1\u5668\u660e\u786e\u7684\u7f13\u5b58NAS\u8bbe\u5907\u8fd4\u56de\u7684\u6587\u4ef6\u201c\u53e5\u67c4\u201d\u3002\u7b2c\u4e00\u6b21\u8bfb\u53d6\u4e00\u4e2a\u6587\u4ef6\u65f6\uff0c\u56fe\u7247\u5b58\u50a8\u670d\u52a1\u5668\u6b63\u5e38\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\uff0c\u5c06\u6587\u4ef6\u540d\u4e0e\u6587\u4ef6\u201c\u53e5\u67c4\u201d\u7684\u6620\u5c04\u7f13\u5b58\u5230memcache\u4e2d\u3002\u540c\u65f6\uff0c\u6211\u4eec\u5728os\u5185\u6838\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e2a\u901a\u8fc7\u53e5\u67c4\u6253\u5f00\u6587\u4ef6\u7684\u63a5\u53e3\uff0c\u5f53\u67e5\u8be2\u88ab\u7f13\u5b58\u7684\u6587\u4ef6\u65f6\uff0c\u56fe\u7247\u5b58\u50a8\u670d\u52a1\u5668\u76f4\u63a5\u7528\u6b64\u63a5\u53e3\u548c\u201c\u53e5\u67c4\u201d\u53c2\u6570\u6253\u5f00\u6587\u4ef6\u3002\u9057\u61be\u7684\u662f\uff0c\u6587\u4ef6\u201c\u53e5\u67c4\u201d\u7f13\u5b58\u6539\u8fdb\u4e0d\u5927\uff0c\u56e0\u4e3a\u8d8a\u51b7\u95e8\u7684\u56fe\u7247\u8d8a\u96be\u88ab\u7f13\u5b58\u5230\uff08\u6ca1\u6709\u89e3\u51b3long tail\u95ee\u9898\uff09\u3002\u503c\u5f97\u8ba8\u8bba\u7684\u662f\u53ef\u4ee5\u5c06\u6240\u6709\u6587\u4ef6\u201c\u53e5\u67c4\u201d\u7f13\u5b58\u5230memcache\uff0c\u4e0d\u8fc7\u8fd9\u4e5f\u9700\u8981NAS\u8bbe\u5907\u80fd\u7f13\u5b58\u6240\u6709\u7684inode\u4fe1\u606f\uff0c\u8fd9\u4e48\u505a\u662f\u975e\u5e38\u6602\u8d35\u7684\u3002\u603b\u7ed3\u4e00\u4e0b\uff0c\u6211\u4eec\u4eceNAS\u65b9\u6848\u5438\u53d6\u7684\u4e3b\u8981\u6559\u8bad\u662f\uff0c\u4ec5\u9488\u5bf9\u7f13\u5b58\u2014\u2014\u4e0d\u7ba1\u662fNAS\u8bbe\u5907\u7f13\u5b58\u8fd8\u662f\u989d\u5916\u7684\u50cfmemcache\u7f13\u5b58\u2014\u2014\u5bf9\u51cf\u5c11\u78c1\u76d8\u64cd\u4f5c\u7684\u6539\u8fdb\u662f\u6709\u9650\u7684\u3002\u5b58\u50a8\u7cfb\u7edf\u7ec8\u7a76\u662f\u8981\u5904\u7406long tail\u8bf7\u6c42\uff08\u4e0d\u70ed\u95e8\u56fe\u7247\uff09\u3002<\/p>\n<h5>2.3 \u8ba8\u8bba<\/h5>\n<p>\u6211\u4eec\u5f88\u96be\u63d0\u51fa\u4e00\u4e2a\u6307\u5bfc\u65b9\u9488\u5173\u4e8e\u4f55\u65f6\u5e94\u8be5\u6784\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684\u5b58\u50a8\u7cfb\u7edf\u3002\u4e0b\u9762\u662f\u6211\u4eec\u5728\u6700\u7ec8\u51b3\u5b9a\u642d\u5efaHaystack\u4e4b\u524d\u7684\u4e00\u4e9b\u601d\u8003\uff0c\u5e0c\u671b\u80fd\u7ed9\u5927\u5bb6\u63d0\u4f9b\u53c2\u8003\u3002<\/p>\n<p>\u9762\u5bf9\u57fa\u4e8eNFS\u8bbe\u8ba1\u7684\u74f6\u9888\uff0c\u6211\u4eec\u63a2\u8ba8\u4e86\u662f\u5426\u53ef\u4ee5\u6784\u5efa\u4e00\u4e2a\u7c7b\u4f3cGFS\u7684\u7cfb\u7edf\u3002\u800c\u6211\u4eec\u5927\u90e8\u5206\u7528\u6237\u6570\u636e\u90fd\u5b58\u50a8\u5728Mysql\u6570\u636e\u5e93\uff0c\u6587\u4ef6\u5b58\u50a8\u4e3b\u8981\u7528\u4e8e\u5f00\u53d1\u5de5\u4f5c\u3001\u65e5\u5fd7\u6570\u636e\u4ee5\u53ca\u56fe\u7247\u3002NAS\u8bbe\u5907\u5176\u5b9e\u4e3a\u8fd9\u4e9b\u573a\u666f\u63d0\u4f9b\u4e86\u6027\u4ef7\u6bd4\u5f88\u597d\u7684\u65b9\u6848\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8865\u5145\u4e86hadoop\u4ee5\u4f9b\u6d77\u91cf\u65e5\u5fd7\u6570\u636e\u5904\u7406\u3002\u9762\u5bf9\u56fe\u7247\u670d\u52a1\u7684long tail\u95ee\u9898\uff0cMysql\u3001NAS\u3001Hadoop\u90fd\u4e0d\u592a\u5408\u9002\u3002<\/p>\n<p>\u6211\u4eec\u9762\u4e34\u7684\u56f0\u5883\u53ef\u7b80\u79f0\u4e3a\u201c\u5df2\u5b58\u5728\u5b58\u50a8\u7cfb\u7edf\u7f3a\u4e4f\u5408\u9002\u7684RAM-to-disk\u6bd4\u7387\u201d\u3002\u7136\u800c\uff0c\u6ca1\u6709\u4ec0\u4e48\u6bd4\u7387\u662f\u7edd\u5bf9\u6b63\u786e\u7684\u3002\u7cfb\u7edf\u9700\u8981\u8db3\u591f\u7684\u5185\u5b58\u624d\u80fd\u7f13\u5b58\u6240\u6709\u7684\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u3002\u5728\u6211\u4eec\u57fa\u4e8eNAS\u7684\u65b9\u6848\u4e2d\uff0c\u4e00\u4e2a\u56fe\u7247\u5bf9\u5e94\u5230\u4e00\u4e2a\u6587\u4ef6\uff0c\u6bcf\u4e2a\u6587\u4ef6\u9700\u8981\u81f3\u5c11\u4e00\u4e2ainode\uff0c\u8fd9\u5df2\u7ecf\u5360\u4e86\u51e0\u767ebyte\u3002\u63d0\u4f9b\u8db3\u591f\u7684\u5185\u5b58\u592a\u6602\u8d35\u3002\u6240\u4ee5\u6211\u4eec\u51b3\u5b9a\u6784\u5efa\u4e00\u4e2a\u5b9a\u5236\u5b58\u50a8\u7cfb\u7edf\uff0c\u51cf\u5c11\u6bcf\u4e2a\u56fe\u7247\u7684\u5143\u6570\u636e\u603b\u91cf\uff0c\u4ee5\u4fbf\u80fd\u6709\u8db3\u591f\u7684\u5185\u5b58\u3002\u76f8\u5bf9\u8d2d\u4e70\u66f4\u591a\u7684NAS\u8bbe\u5907\uff0c\u8fd9\u662f\u66f4\u52a0\u53ef\u884c\u7684\u3001\u6027\u4ef7\u6bd4\u66f4\u597d\u7684\u65b9\u6848\u3002<\/p>\n<h5>3 \u8bbe\u8ba1\u548c\u5b9e\u73b0<\/h5>\n<p>Facebook\u4f7f\u7528CDN\u6765\u652f\u6491\u70ed\u95e8\u56fe\u7247\u67e5\u8be2\uff0c\u7ed3\u5408Haystack\u5219\u89e3\u51b3\u4e86\u5b83\u7684long tail\u95ee\u9898\u3002\u5982\u679cweb\u7ad9\u70b9\u5728\u67e5\u8be2\u9759\u6001\u5185\u5bb9\u65f6\u9047\u5230I\/O\u74f6\u9888\uff0c\u4f20\u7edf\u65b9\u6848\u5c31\u662f\u4f7f\u7528CDN\uff0c\u5b83\u4e3a\u4e0b\u6e38\u7684\u5b58\u50a8\u7cfb\u7edf\u6321\u4f4f\u4e86\u7edd\u5927\u90e8\u5206\u7684\u67e5\u8be2\u8bf7\u6c42\u3002\u5728Facebook\uff0c\u4e3a\u4e86\u4f20\u7edf\u7684\u3001\u5ec9\u4ef7\u7684\u7684\u5e95\u5c42\u5b58\u50a8\u4e0d\u53d7I\/O\u6446\u5e03\uff0cCDN\u5f80\u5f80\u9700\u8981\u7f13\u5b58\u96be\u4ee5\u7f6e\u4fe1\u7684\u6d77\u91cf\u9759\u6001\u5185\u5bb9\u3002<\/p>\n<p>\u4e0a\u9762\u5df2\u7ecf\u8bba\u8ff0\u8fc7\uff0c\u5728\u4e0d\u4e45\u7684\u5c06\u6765\uff0cCDN\u4e5f\u4e0d\u80fd\u5b8c\u5168\u7684\u89e3\u51b3\u6211\u4eec\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u6211\u4eec\u8bbe\u8ba1\u4e86Haystack\u6765\u89e3\u51b3\u8fd9\u4e2a\u4e25\u91cd\u74f6\u9888\uff1a\u78c1\u76d8\u64cd\u4f5c\u3002\u6211\u4eec\u63a5\u53d7long tail\u8bf7\u6c42\u5fc5\u7136\u5bfc\u81f4\u78c1\u76d8\u64cd\u4f5c\u7684\u73b0\u5b9e\uff0c\u4f46\u662f\u4f1a\u5c3d\u91cf\u51cf\u5c11\u9664\u4e86\u8bbf\u95ee\u771f\u5b9e\u56fe\u7247\u6570\u636e\u4e4b\u5916\u7684\u5176\u4ed6\u64cd\u4f5c\u3002Haystack\u6709\u6548\u7684\u51cf\u5c11\u4e86\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u7684\u7a7a\u95f4\uff0c\u5e76\u5728\u5185\u5b58\u4e2d\u4fdd\u5b58\u6240\u6709\u5143\u6570\u636e\u3002<\/p>\n<p>\u6bcf\u4e2a\u56fe\u7247\u5b58\u50a8\u4e3a\u4e00\u4e2a\u6587\u4ef6\u5c06\u4f1a\u5bfc\u81f4\u5143\u6570\u636e\u592a\u591a\uff0c\u96be\u4ee5\u88ab\u5168\u90e8\u7f13\u5b58\u3002Haystack\u7684\u5bf9\u7b56\u662f\uff1a\u5c06\u591a\u4e2a\u56fe\u7247\u5b58\u50a8\u5728\u5355\u4e2a\u6587\u4ef6\u4e2d\uff0c\u63a7\u5236\u6587\u4ef6\u4e2a\u6570\uff0c\u7ef4\u62a4\u5927\u578b\u6587\u4ef6\uff0c\u6211\u4eec\u5c06\u8bba\u8ff0\u6b64\u65b9\u6848\u662f\u975e\u5e38\u6709\u6548\u7684\u3002\u53e6\u5916\uff0c\u6211\u4eec\u5f3a\u8c03\u4e86\u5b83\u8bbe\u8ba1\u7684\u7b80\u6d01\u6027\uff0c\u4ee5\u4fc3\u8fdb\u5feb\u901f\u7684\u5b9e\u73b0\u548c\u90e8\u7f72\u3002\u6211\u4eec\u5c06\u4ee5\u6b64\u6838\u5fc3\u6280\u672f\u5c55\u5f00\uff0c\u7ed3\u5408\u5b83\u5468\u8fb9\u7684\u6240\u6709\u67b6\u6784\u7ec4\u4ef6\uff0c\u63cf\u8ff0Haystack\u662f\u5982\u4f55\u5b9e\u73b0\u4e86\u4e00\u4e2a\u9ad8\u53ef\u9760\u3001\u9ad8\u53ef\u7528\u7684\u5b58\u50a8\u7cfb\u7edf\u3002\u5728\u4e0b\u9762\u5bf9Haystack\u7684\u4ecb\u7ecd\u4e2d\uff0c\u9700\u8981\u533a\u5206\u4e24\u79cd\u5143\u6570\u636e\uff0c\u4e0d\u8981\u6df7\u6dc6\u3002\u4e00\u79cd\u662f\u5e94\u7528\u5143\u6570\u636e\uff0c\u5b83\u662f\u7528\u6765\u4e3a\u6d4f\u89c8\u5668\u6784\u9020\u68c0\u7d22\u56fe\u7247\u6240\u9700\u7684URL\uff1b\u53e6\u4e00\u79cd\u662f\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\uff0c\u7528\u4e8e\u5728\u78c1\u76d8\u4e0a\u68c0\u7d22\u6587\u4ef6\u3002<\/p>\n<h5>3.1 \u6982\u89c8<\/h5>\n<p>Haystack\u67b6\u6784\u5305\u542b3\u4e2a\u6838\u5fc3\u7ec4\u4ef6\uff1aHaytack Store\u3001Haystack Directory\u548cHaystack Cache\uff08\u7b80\u5355\u8d77\u89c1\u6211\u4eec\u4e0b\u9762\u5c31\u4e0d\u5e26Haystack\u524d\u7f00\u4e86\uff09\u3002Store\u662f\u6301\u4e45\u5316\u5b58\u50a8\u7cfb\u7edf\uff0c\u5e76\u8d1f\u8d23\u7ba1\u7406\u56fe\u7247\u7684\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u3002Store\u5c06\u6570\u636e\u5b58\u50a8\u5728\u7269\u7406\u7684\u5377\u4e0a\u3002\u6bd4\u5982\uff0c\u5728\u4e00\u53f0\u673a\u5668\u4e0a\u63d0\u4f9b100\u4e2a\u7269\u7406\u5377\uff0c\u6bcf\u4e2a\u63d0\u4f9b100GB\u7684\u5b58\u50a8\u5bb9\u91cf\uff0c\u6574\u53f0\u673a\u5668\u5219\u53ef\u4ee5\u652f\u649110TB\u7684\u5b58\u50a8\u3002\u66f4\u8fdb\u4e00\u6b65\uff0c\u4e0d\u540c\u673a\u5668\u4e0a\u7684\u591a\u4e2a\u7269\u7406\u5377\u5c06\u5bf9\u5e94\u4e00\u4e2a\u903b\u8f91\u5377\u3002Haystack\u5c06\u4e00\u4e2a\u56fe\u7247\u5b58\u50a8\u5230\u4e00\u4e2a\u903b\u8f91\u5377\u65f6\uff0c\u56fe\u7247\u88ab\u5199\u5165\u5230\u6240\u6709\u5bf9\u5e94\u7684\u7269\u7406\u5377\u3002\u8fd9\u4e2a\u5197\u4f59\u53ef\u907f\u514d\u7531\u4e8e\u786c\u76d8\u6545\u969c\uff0c\u78c1\u76d8\u63a7\u5236\u5668bug\u7b49\u5bfc\u81f4\u7684\u6570\u636e\u4e22\u5931\u3002Directory\u7ef4\u62a4\u4e86\u903b\u8f91\u5230\u7269\u7406\u5377\u7684\u6620\u5c04\u4ee5\u53ca\u5176\u4ed6\u5e94\u7528\u5143\u6570\u636e\uff0c\u6bd4\u5982\u67d0\u4e2a\u56fe\u7247\u5bc4\u5b58\u5728\u54ea\u4e2a\u903b\u8f91\u5377\u3001\u67d0\u4e2a\u903b\u8f91\u5377\u7684\u7a7a\u95f2\u7a7a\u95f4\u7b49\u3002Cache\u7684\u529f\u80fd\u7c7b\u4f3c\u6211\u4eec\u7cfb\u7edf\u5185\u90e8\u7684CDN\uff0c\u5b83\u5e2eStore\u6321\u4f4f\u70ed\u95e8\u56fe\u7247\u7684\u8bf7\u6c42\uff08\u53ef\u4ee5\u7f13\u5b58\u7684\u5c31\u7edd\u4e0d\u4ea4\u7ed9\u4e0b\u6e38\u7684\u6301\u4e45\u5316\u5b58\u50a8\uff09\u3002\u5728\u72ec\u7acb\u8bbe\u8ba1Haystack\u65f6\uff0c\u6211\u4eec\u8981\u8bbe\u60f3\u5b83\u5904\u4e8e\u4e00\u4e2a\u6ca1\u6709CDN\u7684\u5927\u73af\u5883\u4e2d\uff0c\u5373\u4f7f\u6709CDN\u4e5f\u8981\u9884\u9632\u5176\u8282\u70b9\u6545\u969c\u5bfc\u81f4\u5927\u91cf\u8bf7\u6c42\u76f4\u63a5\u8fdb\u5165\u5b58\u50a8\u7cfb\u7edf\uff0c\u6240\u4ee5Cache\u662f\u5341\u5206\u5fc5\u8981\u7684\u3002<\/p>\n<p><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/3.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/3.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/3.jpg\" \/><\/a><\/p>\n<p>\u56fe3\u8bf4\u660e\u4e86Store\u3001Directory\u3001Cache\u662f\u5982\u4f55\u534f\u4f5c\u7684\uff0c\u4ee5\u53ca\u5982\u4f55\u4e0e\u5916\u90e8\u7684\u6d4f\u89c8\u5668\u3001web\u670d\u52a1\u5668\u3001CDN\u548c\u5b58\u50a8\u7cfb\u7edf\u4ea4\u4e92\u3002\u5728Haystack\u67b6\u6784\u4e2d\uff0c\u6d4f\u89c8\u5668\u4f1a\u88ab\u5f15\u5bfc\u81f3CDN\u6216\u8005Cache\u4e0a\u3002\u9700\u8981\u6ce8\u610f\u7684\u662fCache\u672c\u8d28\u4e0a\u4e5f\u662f\u4e00\u4e2aCDN\uff0c\u4e3a\u4e86\u907f\u514d\u56f0\u60d1\uff0c\u6211\u4eec\u4f7f\u7528\u201cCDN\u201d\u8868\u793a\u5916\u90e8\u7684\u7cfb\u7edf\u3001\u4f7f\u7528\u201cCache\u201d\u8868\u793a\u6211\u4eec\u5185\u90e8\u7684\u7cfb\u7edf\u3002\u6709\u4e00\u4e2a\u5185\u90e8\u7684\u7f13\u5b58\u8bbe\u65bd\u80fd\u51cf\u5c11\u5bf9\u5916\u90e8CDN\u7684\u4f9d\u8d56\u3002<\/p>\n<p>\u5f53\u7528\u6237\u8bbf\u95ee\u4e00\u4e2a\u9875\u9762\uff0cweb\u670d\u52a1\u5668\u4f7f\u7528Directory\u4e3a\u6bcf\u4e2a\u56fe\u7247\u6765\u6784\u5efa\u4e00\u4e2aURL\uff08Directory\u4e2d\u6709\u8db3\u591f\u7684\u5e94\u7528\u5143\u6570\u636e\u6765\u6784\u9020URL\uff09\u3002URL\u5305\u542b\u51e0\u5757\u4fe1\u606f\uff0c\u6bcf\u4e00\u5757\u5185\u5bb9\u53ef\u4ee5\u5bf9\u5e94\u5230\u4ece\u6d4f\u89c8\u5668\u8bbf\u95eeCDN(\u6216\u8005Cache)\u76f4\u81f3\u6700\u7ec8\u5728\u4e00\u53f0Store\u673a\u5668\u4e0a\u68c0\u7d22\u5230\u56fe\u7247\u7684\u5404\u4e2a\u6b65\u9aa4\u3002\u4e00\u4e2a\u5178\u578b\u7684URL\u5982\u4e0b\uff1a<\/p>\n<p>http:\/\/&lt;CDN&gt;\/&lt;Cache&gt;\/&lt;Machine id&gt;\/&lt;Logical volume, Photo&gt;<\/p>\n<p>\u7b2c\u4e00\u4e2a\u90e8\u5206&lt;CDN&gt;\u6307\u660e\u4e86\u4ece\u54ea\u4e2aCDN\u67e5\u8be2\u6b64\u56fe\u7247\u3002\u5230CDN\u540e\u5b83\u4f7f\u7528\u6700\u540e\u90e8\u5206\u7684URL\uff08\u903b\u8f91\u5377\u548c\u56fe\u7247ID\uff09\u5373\u53ef\u67e5\u627e\u7f13\u5b58\u7684\u56fe\u7247\u3002\u5982\u679cCDN\u672a\u547d\u4e2d\u7f13\u5b58\uff0c\u5b83\u4eceURL\u4e2d\u5220\u9664&lt;CDN&gt;\u76f8\u5173\u4fe1\u606f\uff0c\u7136\u540e\u8bbf\u95eeCache\u3002Cache\u7684\u67e5\u627e\u8fc7\u7a0b\u4e0e\u4e4b\u7c7b\u4f3c\uff0c\u5982\u679c\u8fd8\u6ca1\u547d\u4e2d\uff0c\u5219\u53bb\u6389&lt;Cache&gt;\u76f8\u5173\u4fe1\u606f\uff0c\u8bf7\u6c42\u88ab\u53d1\u81f3\u6307\u5b9a\u7684Store\u673a\u5668(&lt;Machine id&gt;)\u3002\u5982\u679c\u8bf7\u6c42\u4e0d\u7ecf\u8fc7CDN\u76f4\u63a5\u53d1\u81f3Cache\uff0c\u5176\u8fc7\u7a0b\u4e0e\u4e0a\u8ff0\u7c7b\u4f3c\uff0c\u53ea\u662f\u5c11\u4e86CDN\u8fd9\u4e2a\u73af\u8282\u3002<\/p>\n<p><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/4.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/4.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/4.jpg\" \/><\/a><\/p>\n<p>\u56fe4\u8bf4\u660e\u4e86\u5728Haystack\u4e2d\u7684\u4e0a\u4f20\u6d41\u7a0b\u3002\u7528\u6237\u4e0a\u4f20\u4e00\u4e2a\u56fe\u7247\u65f6\uff0c\u5979\u9996\u5148\u53d1\u9001\u6570\u636e\u5230web\u670d\u52a1\u5668\u3002web\u670d\u52a1\u5668\u968f\u540e\u4eceDirectory\u4e2d\u8bf7\u6c42\u4e00\u4e2a\u53ef\u5199\u903b\u8f91\u5377\u3002\u6700\u540e\uff0cweb\u670d\u52a1\u5668\u4e3a\u56fe\u7247\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684ID\uff0c\u7136\u540e\u5c06\u5176\u4e0a\u4f20\u81f3\u903b\u8f91\u5377\u5bf9\u5e94\u7684\u6bcf\u4e2a\u7269\u7406\u5377\u3002<\/p>\n<h5>3.2 Haystack Directory<\/h5>\n<p>Directory\u63d0\u4f9b4\u4e2a\u4e3b\u8981\u529f\u80fd\u3002\u9996\u5148\uff0c\u5b83\u63d0\u4f9b\u4e00\u4e2a\u4ece\u903b\u8f91\u5377\u5230\u7269\u7406\u5377\u7684\u6620\u5c04\u3002web\u670d\u52a1\u5668\u4e0a\u4f20\u56fe\u7247\u548c\u6784\u5efa\u56fe\u7247URL\u65f6\u90fd\u9700\u8981\u4f7f\u7528\u8fd9\u4e2a\u6620\u5c04\u3002\u7b2c\u4e8c\uff0cDirectory\u5728\u5206\u914d\u5199\u8bf7\u6c42\u5230\u903b\u8f91\u5377\u3001\u5206\u914d\u8bfb\u8bf7\u6c42\u5230\u7269\u7406\u5377\u65f6\u9700\u4fdd\u8bc1\u8d1f\u8f7d\u5747\u8861\u3002\u7b2c\u4e09\uff0cDirectory\u51b3\u5b9a\u4e00\u4e2a\u56fe\u7247\u8bf7\u6c42\u5e94\u8be5\u88ab\u53d1\u81f3CDN\u8fd8\u662fCache\uff0c\u8fd9\u4e2a\u529f\u80fd\u53ef\u4ee5\u8ba9\u6211\u4eec\u52a8\u6001\u8c03\u6574\u662f\u5426\u4f9d\u8d56CDN\u3002\u7b2c\u56db\uff0cDirectory\u6307\u660e\u90a3\u4e9b\u903b\u8f91\u5377\u662f\u53ea\u8bfb\u7684\uff08\u53ea\u8bfb\u9650\u5236\u53ef\u80fd\u662f\u6e90\u81ea\u8fd0\u7ef4\u539f\u56e0\u3001\u6216\u8005\u8fbe\u5230\u5b58\u50a8\u5bb9\u91cf\u4e0a\u9650\uff1b\u4e3a\u4e86\u8fd0\u7ef4\u65b9\u4fbf\uff0c\u6211\u4eec\u4ee5\u673a\u5668\u7c92\u5ea6\u6765\u6807\u8bb0\u5377\u7684\u53ea\u8bfb\uff09\u3002<\/p>\n<p>\u5f53\u6211\u4eec\u589e\u52a0\u65b0\u673a\u5668\u4ee5\u589e\u5927Store\u7684\u5bb9\u91cf\u65f6\uff0c\u90a3\u4e9b\u65b0\u673a\u5668\u662f\u53ef\u5199\u7684\uff1b\u4ec5\u4ec5\u53ef\u5199\u7684\u673a\u5668\u4f1a\u6536\u5230upload\u8bf7\u6c42\u3002\u968f\u65f6\u95f4\u6d41\u901d\u8fd9\u4e9b\u673a\u5668\u7684\u53ef\u7528\u5bb9\u91cf\u4f1a\u4e0d\u65ad\u51cf\u5c11\u3002\u5f53\u4e00\u4e2a\u673a\u5668\u8fbe\u5230\u5bb9\u91cf\u4e0a\u9650\uff0c\u6211\u4eec\u6807\u8bb0\u5b83\u4e3a\u53ea\u8bfb\uff0c\u5728\u4e0b\u4e00\u4e2a\u5b50\u7ae0\u8282\u6211\u4eec\u5c06\u8ba8\u8bba\u5982\u4f55\u8fd9\u4e2a\u7279\u6027\u5982\u4f55\u5f71\u54cdCache\u548cStore\u3002<\/p>\n<p>Directory\u5c06\u5e94\u7528\u5143\u6570\u636e\u5b58\u50a8\u5728\u4e00\u4e2a\u5197\u4f59\u590d\u5236\u7684\u6570\u636e\u5e93\uff0c\u901a\u8fc7\u4e00\u4e2aPHP\u63a5\u53e3\u8bbf\u95ee\uff0c\u4e5f\u53ef\u4ee5\u6362\u6210memcache\u4ee5\u51cf\u5c11\u5ef6\u8fdf\u3002\u5f53\u4e00\u4e2aStore\u673a\u5668\u6545\u969c\u3001\u6570\u636e\u4e22\u5931\u65f6\uff0cDirectory\u5728\u5e94\u7528\u5143\u6570\u636e\u4e2d\u5220\u9664\u5bf9\u5e94\u7684\u9879\uff0c\u65b0Store\u673a\u5668\u4e0a\u7ebf\u540e\u5219\u63a5\u66ff\u6b64\u9879\u3002<\/p>\n<p>\u3010\u8bd1\u8005YY\u30113.2\u7ae0\u8282\u662f\u6574\u7bc7\u6587\u7ae0\u4e2d\u552f\u4e00\u4e00\u5904\u8bd1\u8005\u8ba4\u4e3a\u6ca1\u6709\u89e3\u91ca\u6e05\u695a\u7684\u73af\u8282\u3002\u7ed3\u54083.1\u7ae0\u8282\u4e2d\u7684URL\u7ed3\u6784\u89e3\u6790\u90e8\u5206\uff0c\u8bfb\u8005\u53ef\u4ee5\u53d1\u73b0Directory\u9700\u8981\u62ff\u5230\u56fe\u7247\u7684\u201c\u539f\u59cbURL\u201d\uff08\u9875\u9762html\u4e2dlink\u7684URL\uff09\uff0c\u518d\u7ed3\u5408\u5e94\u7528\u5143\u6570\u636e\uff0c\u5c31\u53ef\u4ee5\u6784\u9020\u51fa\u201c\u5f15\u5bfcURL\u201d\u4ee5\u4f9b\u4e0b\u6e38\u4f7f\u7528\u3002\u4ece3.2\u4e2d\u6211\u4eec\u77e5\u9053Directory\u5fc5\u7136\u4fdd\u5b58\u4e86\u903b\u8f91\u5377\u5230\u7269\u7406\u5377\u7684\u6620\u5c04\uff0c\u4ec5\u7528\u6b64\u6620\u5c04+\u539f\u59cbURL\u8db3\u591f\u53d1\u6398\u5176\u4ed6\u5e94\u7528\u5143\u6570\u636e\u5417\uff1f\u539f\u59cbURL\u4e2d\u5230\u5e95\u5305\u542b\u4e86\u4ec0\u4e48\u4fe1\u606f\uff08\u8bba\u6587\u4e2d\u6ca1\u770b\u5230\u4ecb\u7ecd\uff09\uff1f\u6211\u4eec\u53ef\u4ee5\u505a\u4e2a\u5047\u8bbe\uff0c\u5047\u5982\u539f\u59cbURL\u4e2d\u4ec5\u4ec5\u5305\u542b\u56fe\u7247ID\uff0c\u90a3Directory\u5982\u4f55\u5f97\u77e5\u5b83\u5bf9\u5e94\u54ea\u4e2a\u903b\u8f91\u5377\uff08\u5fc5\u987b\u5148\u5b8c\u6210\u8fd9\u4e00\u6b65\u6620\u5c04\uff0c\u624d\u80fd\u7ee7\u7eed\u6316\u6398\u66f4\u591a\u5e94\u7528\u5143\u6570\u636e\uff09\uff1fDirectory\u662f\u5426\u5728upload\u9636\u6bb5\u5c06\u56fe\u7247ID\u4e0e\u903b\u8f91\u5377\u7684\u6620\u5c04\u4e5f\u4fdd\u5b58\u4e86\uff1f\u5982\u679c\u662f\uff0c\u90a3\u8fd9\u4e2a\u6620\u5c04\u7684\u6570\u636e\u91cf\u4e0d\u80fd\u5ffd\u7565\u4e0d\u8ba1\uff0c\u8bba\u6587\u4e5f\u4e0d\u8be5\u4e00\u7b14\u5e26\u8fc7\u3002<\/p>\n<p>\u4ece\u539f\u6587\u4e00\u4e9b\u7ec6\u679d\u672b\u8282\u7684\u63cf\u8ff0\u4e2d\uff0c\u8bd1\u8005\u8ba4\u4e3aDirectory\u786e\u5b9e\u4fdd\u5b58\u4e86\u5f88\u591a\u4e0e\u56fe\u7247ID\u76f8\u5173\u7684\u5143\u6570\u636e\uff08\u5b58\u50a8\u5728\u54ea\u4e2a\u903b\u8f91\u5377\u3001cookie\u7b49\uff09\u3002\u4f46\u6574\u7bc7\u8bba\u6587\u8bd1\u8005\u4e5f\u6ca1\u627e\u5230\u5bf9\u7b56\uff0c\u603b\u611f\u89c9\u8fd9\u6837\u6027\u4ef7\u6bd4\u592a\u4f4e\uff0c\u4e0d\u7b26\u5408Haystack\u7684\u4f5c\u98ce\u3002\u5bf9\u4e8e\u8fd9\u4e2a\u7591\u60d1\uff0c\u6587\u7ae0\u672b\u5c3e\u6269\u5c55\u9605\u8bfb\u90e8\u5206\u5c06\u5c1d\u8bd5\u89e3\u7b54\u3002\u8bfb\u8005\u5148\u8ba4\u4e3a\u5176\u5177\u5907\u6b64\u80fd\u529b\u5427\u3002<\/p>\n<h5>3.3 Haystack Cache<\/h5>\n<p>Cache\u4f1a\u4eceCDN\u6216\u8005\u76f4\u63a5\u4ece\u7528\u6237\u6d4f\u89c8\u5668\u63a5\u6536\u5230\u56fe\u7247\u67e5\u8be2\u8bf7\u6c42\u3002Cache\u7684\u5b9e\u73b0\u53ef\u7406\u89e3\u4e3a\u4e00\u4e2a\u5206\u5e03\u5f0fHash Table\uff0c\u4f7f\u7528\u56fe\u7247ID\u4f5c\u4e3akey\u6765\u5b9a\u4f4d\u7f13\u5b58\u7684\u6570\u636e\u3002\u5982\u679cCache\u672a\u547d\u4e2d\uff0cCache\u5219\u6839\u636eURL\u4ece\u6307\u5b9aStore\u673a\u5668\u4e0a\u83b7\u53d6\u56fe\u7247\uff0c\u89c6\u60c5\u51b5\u56de\u590d\u7ed9CDN\u6216\u8005\u7528\u6237\u6d4f\u89c8\u5668\u3002<\/p>\n<p>\u6211\u4eec\u73b0\u5728\u5f3a\u8c03\u4e00\u4e0bCache\u7684\u4e00\u4e2a\u91cd\u8981\u884c\u4e3a\u6982\u5ff5\u3002\u53ea\u6709\u5f53\u7b26\u5408\u4e24\u79cd\u6761\u4ef6\u4e4b\u4e00\u65f6\u5b83\u624d\u4f1a\u7f13\u5b58\u56fe\u7247\uff1a(a)\u8bf7\u6c42\u76f4\u63a5\u6765\u81ea\u7528\u6237\u6d4f\u89c8\u5668\u800c\u4e0d\u662fCDN\uff1b(b)\u56fe\u7247\u83b7\u53d6\u81ea\u4e00\u4e2a\u53ef\u5199\u7684Store\u673a\u5668\u3002\u7b2c\u4e00\u4e2a\u6761\u4ef6\u7684\u7406\u7531\u662f\u4e00\u4e2a\u8bf7\u6c42\u5982\u679c\u5728CDN\u4e2d\u6ca1\u547d\u4e2d\uff08\u975e\u70ed\u95e8\u56fe\u7247\uff09\uff0c\u90a3\u5728\u6211\u4eec\u5185\u90e8\u7f13\u5b58\u4e5f\u4e0d\u592a\u9700\u8981\u547d\u4e2d\uff08\u5373\u4f7f\u6b64\u56fe\u7247\u5f00\u59cb\u9010\u6e10\u6d3b\u8dc3\uff0c\u90a3\u4e5f\u80fd\u5728CDN\u4e2d\u547d\u4e2d\u7f13\u5b58\uff0c\u8fd9\u91cc\u65e0\u9700\u591a\u6b64\u4e00\u4e3e\uff1b\u76f4\u63a5\u7684\u6d4f\u89c8\u5668\u8bf7\u6c42\u8bf4\u660e\u662f\u4e0d\u7ecf\u8fc7CDN\u7684\uff0c\u90a3\u5c31\u9700\u8981Cache\u4ee3\u4e3aCDN\uff0c\u4e3a\u5176\u7f13\u5b58\uff09\u3002\u7b2c\u4e8c\u4e2a\u6761\u4ef6\u7684\u7406\u7531\u662f\u95f4\u63a5\u7684\uff0c\u6709\u70b9\u7ecf\u9a8c\u8bba\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u4fdd\u62a4\u53ef\u5199Store\u673a\u5668\uff1b\u539f\u56e0\u633a\u6709\u610f\u601d\uff0c\u5927\u90e8\u5206\u56fe\u7247\u5728\u4e0a\u4f20\u4e4b\u540e\u5f88\u5feb\u4f1a\u88ab\u9891\u7e41\u8bbf\u95ee\uff08\u6bd4\u5982\u67d0\u4e2a\u7f8e\u5973\u65b0\u4e0a\u4f20\u4e86\u4e00\u5f20\u81ea\u62cd\uff09\uff0c\u800c\u4e14\u6587\u4ef6\u7cfb\u7edf\u5728\u53ea\u6709\u8bfb\u6216\u8005\u53ea\u6709\u5199\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u66f4\u597d\uff0c\u4e0d\u592a\u559c\u6b22\u540c\u65f6\u5e76\u53d1\u8bfb\u5199\uff08\u7ae0\u82824.1\uff09\u3002\u5982\u679c\u6ca1\u6709Cache\uff0c\u53ef\u5199Store\u673a\u5668\u5f80\u5f80\u4f1a\u906d\u9047\u9891\u7e41\u7684\u8bfb\u8bf7\u6c42\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u751a\u81f3\u4f1a\u4e3b\u52a8\u7684\u63a8\u9001\u6700\u8fd1\u4e0a\u4f20\u7684\u56fe\u7247\u5230Cache\u3002<\/p>\n<h5>3.4 Haystack Store<\/h5>\n<p>Store\u673a\u5668\u7684\u63a5\u53e3\u8bbe\u8ba1\u7684\u5f88\u7b80\u7ea6\u3002\u8bfb\u64cd\u4f5c\u53ea\u9700\u63d0\u4f9b\u4e00\u4e9b\u5f88\u660e\u786e\u7684\u5143\u6570\u636e\u4fe1\u606f\uff0c\u5305\u62ec\u56fe\u7247ID\u3001\u54ea\u4e2a\u903b\u8f91\u5377\u3001\u54ea\u53f0\u7269\u7406Store\u673a\u5668\u7b49\u3002\u673a\u5668\u5982\u679c\u627e\u5230\u56fe\u7247\u5219\u8fd4\u56de\u5176\u771f\u5b9e\u6570\u636e\uff0c\u5426\u5219\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n<p>\u6bcf\u4e2aStore\u673a\u5668\u7ba1\u7406\u591a\u4e2a\u7269\u7406\u5377\u3002\u6bcf\u4e2a\u7269\u7406\u5377\u5b58\u6709\u767e\u4e07\u5f20\u56fe\u7247\u3002\u8bfb\u8005\u53ef\u4ee5\u5c06\u4e00\u4e2a\u7269\u7406\u5377\u60f3\u8c61\u4e3a\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u6587\u4ef6\uff08100GB\uff09\uff0c\u4fdd\u5b58\u4e3a\u2019\/hay\/haystack&lt;logical volume id&gt;\u2019\u3002Store\u673a\u5668\u4ec5\u9700\u8981\u903b\u8f91\u5377ID\u548c\u6587\u4ef6offset\u5c31\u80fd\u975e\u5e38\u5feb\u7684\u8bbf\u95ee\u4e00\u4e2a\u56fe\u7247\u3002\u8fd9\u662fHaystack\u8bbe\u8ba1\u7684\u4e3b\u65e8\uff1a\u4e0d\u9700\u8981\u78c1\u76d8\u64cd\u4f5c\u5c31\u53ef\u4ee5\u68c0\u7d22\u6587\u4ef6\u540d\u3001\u504f\u79fb\u91cf\u3001\u6587\u4ef6\u5927\u5c0f\u7b49\u5143\u6570\u636e\u3002Store\u673a\u5668\u4f1a\u5c06\u5176\u4e0b\u6240\u6709\u7269\u7406\u5377\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08open\u7684\u6587\u4ef6\u201c\u53e5\u67c4\u201d\uff0c\u5377\u7684\u6570\u91cf\u4e0d\u591a\uff0c\u6570\u636e\u91cf\u4e0d\u5927\uff09\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\u3002\u540c\u65f6\uff0c\u56fe\u7247ID\u5230\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\uff08\u6587\u4ef6\u3001\u504f\u79fb\u91cf\u3001\u5927\u5c0f\u7b49\uff09\u7684\u6620\u5c04\uff08\u540e\u6587\u7b80\u79f0\u4e3a\u201c\u5185\u5b58\u4e2d\u6620\u5c04\u201d\uff09\u662f\u68c0\u7d22\u56fe\u7247\u7684\u91cd\u8981\u6761\u4ef6\uff0c\u4e5f\u4f1a\u5168\u90e8\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\u3002<\/p>\n<p>\u73b0\u5728\u6211\u4eec\u63cf\u8ff0\u4e00\u4e0b\u7269\u7406\u5377\u548c\u5185\u5b58\u4e2d\u6620\u5c04\u7684\u7ed3\u6784\u3002\u4e00\u4e2a\u7269\u7406\u5377\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u5927\u578b\u6587\u4ef6\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u7cfb\u5217\u7684needle\u3002\u6bcf\u4e2aneedle\u5c31\u662f\u4e00\u5f20\u56fe\u7247\u3002\u56fe5\u8bf4\u660e\u4e86\u5377\u6587\u4ef6\u548c\u6bcf\u4e2aneedle\u7684\u683c\u5f0f\u3002Table1\u63cf\u8ff0\u4e86needle\u4e2d\u7684\u5b57\u6bb5\u3002<\/p>\n<p><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/5.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/5.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/5.jpg\" \/><\/a><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/6.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/6.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/6.jpg\" \/><\/a><\/p>\n<p>\u4e3a\u4e86\u5feb\u901f\u7684\u68c0\u7d22needle\uff0cStore\u673a\u5668\u9700\u8981\u4e3a\u6bcf\u4e2a\u5377\u7ef4\u62a4\u4e00\u4e2a\u5185\u5b58\u4e2d\u7684key-value\u6620\u5c04\u3002\u6620\u5c04\u7684Key\u5c31\u662f\uff08needle.key+needle.alternate_key\uff09\u7684\u7ec4\u5408\uff0c\u6620\u5c04\u7684Value\u5c31\u662fneedle\u7684flag\u3001size\u3001\u5377offset\uff08\u90fd\u4ee5byte\u4e3a\u5355\u4f4d\uff09\u3002\u5982\u679cStore\u673a\u5668\u5d29\u6e83\u3001\u91cd\u542f\uff0c\u5b83\u53ef\u4ee5\u76f4\u63a5\u5206\u6790\u5377\u6587\u4ef6\u6765\u91cd\u65b0\u6784\u5efa\u8fd9\u4e2a\u6620\u5c04\uff08\u6784\u5efa\u5b8c\u6210\u4e4b\u524d\u4e0d\u5904\u7406\u8bf7\u6c42\uff09\u3002\u4e0b\u9762\u6211\u4eec\u4ecb\u7ecdStore\u673a\u5668\u5982\u4f55\u54cd\u5e94\u8bfb\u5199\u548c\u5220\u9664\u8bf7\u6c42\uff08Store\u4ec5\u652f\u6301\u8fd9\u4e9b\u64cd\u4f5c\uff09\u3002<\/p>\n<p>\u3010\u8bd1\u8005\u6ce8\u3011\u4eceTable1\u6211\u4eec\u770b\u5230needle.key\u5c31\u662f\u56fe\u7247ID\uff0c\u4e3a\u4f55\u4ec5\u7528\u56fe\u7247ID\u505a\u5185\u5b58\u4e2d\u6620\u5c04\u7684Key\u8fd8\u4e0d\u591f\uff0c\u8fd8\u9700\u8981\u4e00\u4e2aalternate_key\uff1f\u8fd9\u662f\u56e0\u4e3a\u4e00\u5f20\u7167\u7247\u4f1a\u67094\u4efd\u526f\u672c\uff0c\u5b83\u4eec\u7684\u56fe\u7247ID\u76f8\u540c\uff0c\u53ea\u662f\u7c7b\u578b\u4e0d\u540c\uff08\u6bd4\u5982\u5927\u56fe\u3001\u5c0f\u56fe\u3001\u7f29\u7565\u56fe\u7b49\uff09\uff0c\u4e8e\u662f\u5c06\u56fe\u7247ID\u4f5c\u4e3aneedle.key\uff0c\u5c06\u7c7b\u578b\u4f5c\u4e3aneedle.alternate_key\u3002\u6839\u636e\u8bd1\u8005\u7684\u7406\u89e3\uff0c\u5185\u5b58\u4e2d\u6620\u5c04\u4e0d\u662f\u4e00\u4e2a\u7b80\u5355\u7684HashMap\u7ed3\u6784\uff0c\u800c\u662f\u7c7b\u4f3c\u4e00\u4e2a\u4e24\u5c42\u7684\u5d4c\u5957HashMap\uff0cMap&lt;long\/*needle.key*\/,Map&lt;int\/*alternate_key*\/,Object&gt;&gt;\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u8ba94\u4e2a\u526f\u672c\u5171\u7528\u540c\u4e00\u4e2aneedle.key\uff0c\u907f\u514d\u4e3a\u91cd\u590d\u7684\u5185\u5bb9\u6d6a\u8d39\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<h5>3.4.1 \u8bfb\u53d6\u56fe\u7247<\/h5>\n<p>Cache\u673a\u5668\u5411Store\u673a\u5668\u8bf7\u6c42\u4e00\u4e2a\u56fe\u7247\u65f6\uff0c\u5b83\u9700\u8981\u63d0\u4f9b\u903b\u8f91\u5377id\u3001key\u3001alternate key\uff0c\u548ccookie\u3002cookie\u662f\u4e2a\u6570\u5b57\uff0c\u5d4c\u5728URL\u4e2d\u3002\u5f53\u4e00\u5f20\u65b0\u56fe\u7247\u88ab\u4e0a\u4f20\uff0cDirectory\u4e3a\u5176\u968f\u673a\u5206\u914d\u4e00\u4e2acookie\u503c\uff0c\u5e76\u4f5c\u4e3a\u5e94\u7528\u5143\u6570\u636e\u4e4b\u4e00\u5b58\u50a8\u5728Directory\u3002\u5b83\u5c31\u76f8\u5f53\u4e8e\u4e00\u5f20\u56fe\u7247\u7684\u201c\u79c1\u4eba\u5bc6\u7801\u201d\uff0c\u6b64\u5bc6\u7801\u53ef\u4ee5\u4fdd\u8bc1\u6240\u6709\u53d1\u5f80Cache\u6216CDN\u7684\u8bf7\u6c42\u90fd\u662f\u7ecf\u8fc7Directory\u201c\u6279\u51c6\u201d\u7684\uff08Cache\u548cStore\u90fd\u6301\u6709\u56fe\u7247\u7684cookie\uff0c\u82e5\u7528\u6237\u81ea\u5df1\u5728\u6d4f\u89c8\u5668\u4e2d\u4f2a\u9020\u3001\u731c\u6d4bURL\u6216\u53d1\u8d77\u653b\u51fb\uff0c\u5219\u4f1a\u56e0\u4e3acookie\u4e0d\u5339\u914d\u800c\u5931\u8d25\uff0c\u4ece\u800c\u4fdd\u8bc1Cache\u3001Store\u80fd\u653e\u5fc3\u5904\u7406\u5408\u6cd5\u7684\u56fe\u7247\u8bf7\u6c42\uff09\u3002<\/p>\n<p>\u5f53Store\u673a\u5668\u63a5\u6536\u5230Cache\u673a\u5668\u53d1\u6765\u7684\u56fe\u7247\u67e5\u8be2\u8bf7\u6c42\uff0c\u5b83\u4f1a\u5229\u7528\u5185\u5b58\u4e2d\u6620\u5c04\u5feb\u901f\u7684\u67e5\u627e\u76f8\u5173\u7684\u5143\u6570\u636e\u3002\u5982\u679c\u56fe\u7247\u6ca1\u6709\u88ab\u5220\u9664\uff0cStore\u5219\u5728\u5377\u6587\u4ef6\u4e2dseek\u5230\u76f8\u5e94\u7684offset\uff0c\u4ece\u78c1\u76d8\u4e0a\u8bfb\u53d6\u6574\u4e2aneedle\uff08needle\u7684size\u53ef\u4ee5\u63d0\u524d\u8ba1\u7b97\u51fa\u6765\uff09\uff0c\u7136\u540e\u68c0\u67e5cookie\u548c\u6570\u636e\u5b8c\u6574\u6027\uff0c\u82e5\u5168\u90e8\u5408\u6cd5\u5219\u5c06\u56fe\u7247\u6570\u636e\u8fd4\u56de\u5230Cache\u673a\u5668\u3002<\/p>\n<h5>3.4.2 \u5199\u5165\u56fe\u7247<\/h5>\n<p>\u4e0a\u4f20\u4e00\u4e2a\u56fe\u7247\u5230Haystack\u65f6\uff0cweb\u670d\u52a1\u5668\u5411Directory\u54a8\u8be2\u5f97\u5230\u4e00\u4e2a\u53ef\u5199\u903b\u8f91\u5377\u53ca\u5176\u5bf9\u5e94\u7684\u591a\u53f0Store\u673a\u5668\uff0c\u968f\u540e\u76f4\u63a5\u8bbf\u95ee\u8fd9\u4e9bStore\u673a\u5668\uff0c\u5411\u5176\u63d0\u4f9b\u903b\u8f91\u5377id\u3001key\u3001alternate key\u3001cookie\u548c\u771f\u5b9e\u6570\u636e\u3002\u6bcf\u4e2aStore\u673a\u5668\u4e3a\u56fe\u7247\u521b\u5efa\u4e00\u4e2a\u65b0needle\uff0cappend\u5230\u76f8\u5e94\u7684\u7269\u7406\u5377\u6587\u4ef6\uff0c\u66f4\u65b0\u5185\u5b58\u4e2d\u6620\u5c04\u3002\u8fc7\u7a0b\u5f88\u7b80\u5355\uff0c\u4f46\u662fappend-only\u7b56\u7565\u4e0d\u80fd\u5f88\u597d\u7684\u652f\u6301\u4fee\u6539\u6027\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982\u65cb\u8f6c\uff08\u56fe\u7247\u987a\u65f6\u9488\u65cb\u8f6c90\u5ea6\u4e4b\u7c7b\u7684\uff09\u3002Haystack\u5e76\u4e0d\u5141\u8bb8\u8986\u76d6needle\uff0c\u6240\u4ee5\u56fe\u7247\u7684\u4fee\u6539\u53ea\u80fd\u901a\u8fc7\u6dfb\u52a0\u4e00\u4e2a\u65b0needle\uff0c\u5176\u62e5\u6709\u76f8\u540c\u7684key\u548calternate key\u3002\u5982\u679c\u65b0needle\u88ab\u5199\u5165\u5230\u4e0e\u8001needle\u4e0d\u540c\u7684\u903b\u8f91\u5377\uff0c\u5219\u53ea\u9700\u8981Directory\u66f4\u65b0\u5b83\u7684\u5e94\u7528\u5143\u6570\u636e\uff0c\u672a\u6765\u7684\u8bf7\u6c42\u90fd\u8def\u7531\u5230\u65b0\u903b\u8f91\u5377\uff0c\u4e0d\u4f1a\u83b7\u53d6\u8001\u7248\u672c\u7684\u6570\u636e\u3002\u5982\u679c\u65b0needle\u5199\u5165\u5230\u76f8\u540c\u7684\u903b\u8f91\u5377\uff0cStore\u673a\u5668\u4e5f\u53ea\u662f\u5c06\u5176append\u5230\u76f8\u540c\u7684\u7269\u7406\u5377\u4e2d\u3002Haystack\u5229\u7528\u4e00\u4e2a\u5341\u5206\u7b80\u5355\u7684\u624b\u6bb5\u6765\u533a\u5206\u91cd\u590d\u7684needle\uff0c\u90a3\u5c31\u662f\u5224\u65ad\u5b83\u4eec\u7684offset\uff08\u65b0\u7248\u672c\u7684needle\u80af\u5b9a\u662foffset\u6700\u9ad8\u7684\u90a3\u4e2a\uff09\uff0c\u5728\u6784\u9020\u6216\u66f4\u65b0\u5185\u5b58\u4e2d\u6620\u5c04\u65f6\u5982\u679c\u9047\u5230\u76f8\u540c\u7684needle\uff0c\u5219\u7528offset\u9ad8\u7684\u8986\u76d6\u4f4e\u7684\u3002<\/p>\n<h5>3.4.3 \u56fe\u7247\u5220\u9664<\/h5>\n<p>\u5728\u5220\u9664\u56fe\u7247\u65f6\uff0cStore\u673a\u5668\u5c06\u5185\u5b58\u4e2d\u6620\u5c04\u548c\u5377\u6587\u4ef6\u4e2d\u76f8\u5e94\u7684flag\u540c\u6b65\u7684\u8bbe\u7f6e\u4e3a\u5df2\u5220\u9664\uff08\u8f6f\u5220\u9664\u673a\u5236\uff0c\u6b64\u523b\u4e0d\u4f1a\u5220\u9664needle\u7684\u78c1\u76d8\u6570\u636e\uff09\u3002\u5f53\u63a5\u6536\u5230\u5df2\u5220\u9664\u56fe\u7247\u7684\u67e5\u8be2\u8bf7\u6c42\uff0cStore\u4f1a\u68c0\u67e5\u5185\u5b58\u4e2dflag\u5e76\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u5df2\u5220\u9664needle\u4f9d\u7136\u5360\u7528\u7684\u7a7a\u95f4\u662f\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u7a0d\u540e\u5c06\u8ba8\u8bba\u5982\u4f55\u901a\u8fc7\u538b\u7f29\u6280\u672f\u6765\u56de\u6536\u5df2\u5220\u9664needle\u7684\u7a7a\u95f4\u3002<\/p>\n<h5>3.4.4 \u7d22\u5f15\u6587\u4ef6<\/h5>\n<p>Store\u673a\u5668\u4f7f\u7528\u4e00\u4e2a\u91cd\u8981\u7684\u4f18\u5316\u2014\u2014\u7d22\u5f15\u6587\u4ef6\u2014\u2014\u6765\u5e2e\u52a9\u91cd\u542f\u521d\u59cb\u5316\u3002\u5c3d\u7ba1\u7406\u8bba\u4e0a\u4e00\u4e2a\u673a\u5668\u80fd\u901a\u8fc7\u8bfb\u53d6\u6240\u6709\u7684\u7269\u7406\u5377\u6765\u91cd\u65b0\u6784\u5efa\u5b83\u7684\u5185\u5b58\u4e2d\u6620\u5c04\uff0c\u4f46\u5927\u91cf\u6570\u636e\uff08TB\u7ea7\u522b\uff09\u9700\u8981\u4ece\u78c1\u76d8\u8bfb\u53d6\uff0c\u975e\u5e38\u8017\u65f6\u3002\u7d22\u5f15\u6587\u4ef6\u5141\u8bb8Store\u673a\u5668\u5feb\u901f\u7684\u6784\u5efa\u5185\u5b58\u4e2d\u6620\u5c04\uff0c\u51cf\u5c11\u91cd\u542f\u65f6\u95f4\u3002<\/p>\n<p>Store\u673a\u5668\u4e3a\u6bcf\u4e2a\u5377\u7ef4\u62a4\u4e00\u4e2a\u7d22\u5f15\u6587\u4ef6\u3002\u7d22\u5f15\u6587\u4ef6\u53ef\u4ee5\u60f3\u8c61\u4e3a\u5185\u5b58\u4e2d\u6620\u5c04\u7684\u4e00\u4e2a\u201c\u5b58\u6863\u201d\u3002\u7d22\u5f15\u6587\u4ef6\u7684\u5e03\u5c40\u548c\u5377\u6587\u4ef6\u7c7b\u4f3c\uff0c\u4e00\u4e2a\u8d85\u7ea7\u5757\u5305\u542b\u4e86\u4e00\u7cfb\u5217\u7d22\u5f15\u8bb0\u5f55\uff0c\u6bcf\u4e2a\u8bb0\u5f55\u5bf9\u5e94\u5230\u5404\u4e2aneedle\u3002\u7d22\u5f15\u6587\u4ef6\u4e2d\u7684\u8bb0\u5f55\u4e0e\u5377\u6587\u4ef6\u4e2d\u5bf9\u5e94\u7684needle\u5fc5\u987b\u4fdd\u8bc1\u76f8\u540c\u7684\u5b58\u50a8\u987a\u5e8f\u3002\u56fe6\u63cf\u8ff0\u4e86\u7d22\u5f15\u6587\u4ef6\u7684\u5e03\u5c40\uff0cTable2\u89e3\u91ca\u4e86\u8bb0\u5f55\u4e2d\u7684\u4e0d\u540c\u7684\u5b57\u6bb5\u3002<\/p>\n<p><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/7.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/7.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/7.jpg\" \/><\/a><a href=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/8.jpg\"><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/8.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/8.jpg\" \/><\/a><\/p>\n<p>\u4f7f\u7528\u7d22\u5f15\u5e2e\u52a9\u91cd\u542f\u7a0d\u5fae\u589e\u52a0\u4e86\u7cfb\u7edf\u590d\u6742\u5ea6\uff0c\u56e0\u4e3a\u7d22\u5f15\u6587\u4ef6\u90fd\u662f\u5f02\u6b65\u66f4\u65b0\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5f53\u524d\u7d22\u5f15\u6587\u4ef6\u4e2d\u7684\u201c\u5b58\u6863\u201d\u53ef\u80fd\u4e0d\u662f\u6700\u65b0\u7684\u3002\u5f53\u6211\u4eec\u5199\u5165\u4e00\u4e2a\u65b0\u56fe\u7247\u65f6\uff0cStore\u673a\u5668\u540c\u6b65append\u4e00\u4e2aneedle\u5230\u5377\u6587\u4ef6\u672b\u5c3e\uff0c\u5e76\u5f02\u6b65append\u4e00\u4e2a\u8bb0\u5f55\u5230\u7d22\u5f15\u6587\u4ef6\u3002\u5f53\u6211\u4eec\u5220\u9664\u56fe\u7247\u65f6\uff0cStore\u673a\u5668\u5728\u5bf9\u5e94needle\u4e0a\u540c\u6b65\u8bbe\u7f6eflag\uff0c\u800c\u4e0d\u4f1a\u66f4\u65b0\u7d22\u5f15\u6587\u4ef6\u3002\u8fd9\u4e9b\u8bbe\u8ba1\u51b3\u7b56\u662f\u4e3a\u4e86\u8ba9\u5199\u548c\u5220\u9664\u64cd\u4f5c\u66f4\u5feb\u8fd4\u56de\uff0c\u907f\u514d\u9644\u52a0\u7684\u540c\u6b65\u78c1\u76d8\u5199\u3002\u4f46\u662f\u4e5f\u5bfc\u81f4\u4e86\u4e24\u65b9\u9762\u7684\u5f71\u54cd\uff1a\u4e00\u4e2aneedle\u53ef\u80fd\u6ca1\u6709\u5bf9\u5e94\u7684\u7d22\u5f15\u8bb0\u5f55\u3001\u7d22\u5f15\u8bb0\u5f55\u4e2d\u65e0\u6cd5\u5f97\u77e5\u56fe\u7247\u5df2\u5220\u9664\u3002<\/p>\n<p>\u6211\u4eec\u5c06\u5bf9\u5e94\u4e0d\u5230\u4efb\u4f55\u7d22\u5f15\u8bb0\u5f55\u7684needle\u79f0\u4e3a\u201c\u5b64\u513f\u201d\u3002\u5728\u91cd\u542f\u65f6\uff0cStore\u673a\u5668\u987a\u5e8f\u7684\u68c0\u67e5\u6bcf\u4e2a\u5b64\u513f\uff0c\u91cd\u65b0\u521b\u5efa\u5339\u914d\u7684\u7d22\u5f15\u8bb0\u5f55\uff0cappend\u5230\u7d22\u5f15\u6587\u4ef6\u3002\u6211\u4eec\u80fd\u5feb\u901f\u7684\u8bc6\u522b\u5b64\u513f\u662f\u56e0\u4e3a\u7d22\u5f15\u6587\u4ef6\u4e2d\u6700\u540e\u7684\u8bb0\u5f55\u80fd\u5bf9\u5e94\u5230\u5377\u6587\u4ef6\u4e2d\u6700\u540e\u7684\u975e\u5b64\u513fneedle\u3002\u5904\u7406\u5b8c\u5b64\u513f\u95ee\u9898\uff0cStore\u673a\u5668\u5219\u5f00\u59cb\u4f7f\u7528\u7d22\u5f15\u6587\u4ef6\u521d\u59cb\u5316\u5b83\u7684\u5185\u5b58\u4e2d\u6620\u5c04\u3002<\/p>\n<p>\u7531\u4e8e\u7d22\u5f15\u8bb0\u5f55\u4e2d\u65e0\u6cd5\u5f97\u77e5\u56fe\u7247\u5df2\u5220\u9664\uff0cStore\u673a\u5668\u53ef\u80fd\u53bb\u68c0\u7d22\u4e00\u4e2a\u5b9e\u9645\u4e0a\u5df2\u7ecf\u88ab\u5220\u9664\u7684\u56fe\u7247\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u5728Store\u673a\u5668\u8bfb\u53d6\u6574\u4e2aneedle\u540e\u68c0\u67e5\u5176flag\uff0c\u82e5\u6807\u8bb0\u4e3a\u5df2\u5220\u9664\uff0c\u5219\u66f4\u65b0\u5185\u5b58\u4e2d\u6620\u5c04\u7684flag\uff0c\u5e76\u56de\u590dCache\u6b64\u5bf9\u8c61\u672a\u627e\u5230\u3002<\/p>\n<h5>3.4.5 \u6587\u4ef6\u7cfb\u7edf<\/h5>\n<p>Haystack\u53ef\u4ee5\u7406\u89e3\u4e3a\u57fa\u4e8e\u901a\u7528\u7684\u7c7bUnix\u6587\u4ef6\u7cfb\u7edf\u642d\u5efa\u7684\u5bf9\u8c61\u5b58\u50a8\uff0c\u4f46\u662f\u67d0\u4e9b\u7279\u6b8a\u6587\u4ef6\u7cfb\u7edf\u80fd\u66f4\u597d\u7684\u9002\u5e94Haystack\u3002\u6bd4\u5982\uff0cStore\u673a\u5668\u7684\u6587\u4ef6\u7cfb\u7edf\u5e94\u8be5\u4e0d\u9700\u8981\u592a\u591a\u5185\u5b58\u5c31\u80fd\u591f\u5728\u4e00\u4e2a\u5927\u578b\u6587\u4ef6\u4e0a\u5feb\u901f\u7684\u6267\u884c\u968f\u673aseek\u3002\u5f53\u524d\u6211\u4eec\u6240\u6709\u7684Store\u673a\u5668\u90fd\u5728\u4f7f\u7528\u7684\u6587\u4ef6\u7cfb\u7edf\u662fXFS\uff0c\u4e00\u4e2a\u57fa\u4e8e\u201c\u8303\u56f4(extent)\u201d\u7684\u6587\u4ef6\u7cfb\u7edf\u3002XFS\u6709\u4e24\u4e2a\u4f18\u52bf\uff1a\u9996\u5148\uff0cXFS\u4e2d\u90bb\u8fd1\u7684\u5927\u578b\u6587\u4ef6\u7684\u201dblockmap\u201d\u5f88\u5c0f\uff0c\u53ef\u653e\u5fc3\u4f7f\u7528\u5185\u5b58\u5b58\u50a8\uff1b\u7b2c\u4e8c\uff0cXFS\u63d0\u4f9b\u9ad8\u6548\u6587\u4ef6\u9884\u5206\u914d\uff0c\u51cf\u8f7b\u78c1\u76d8\u788e\u7247\u7b49\u95ee\u9898\u3002<\/p>\n<p>\u4f7f\u7528XFS\uff0cHaystack\u53ef\u4ee5\u5728\u8bfb\u53d6\u4e00\u5f20\u56fe\u7247\u65f6\u5b8c\u5168\u907f\u514d\u68c0\u7d22\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u5bfc\u81f4\u7684\u78c1\u76d8\u64cd\u4f5c\u3002\u4f46\u662f\u8fd9\u5e76\u4e0d\u610f\u5473\u7740Haystack\u80fd\u4fdd\u8bc1\u8bfb\u53d6\u5355\u5f20\u56fe\u7247\u7edd\u5bf9\u53ea\u9700\u8981\u4e00\u4e2a\u78c1\u76d8\u64cd\u4f5c\u3002\u5728\u4e00\u4e9b\u6781\u7aef\u60c5\u51b5\u4e0b\u4f1a\u53d1\u751f\u989d\u5916\u7684\u78c1\u76d8\u64cd\u4f5c\uff0c\u6bd4\u5982\u5f53\u56fe\u7247\u6570\u636e\u8de8\u8d8aXFS\u7684\u201c\u8303\u56f4(extent)\u201d\u6216\u8005RAID\u8fb9\u754c\u65f6\u3002\u4e0d\u8fc7Haystack\u4f1a\u9884\u5206\u914d1GB\u7684\u201c\u8303\u56f4(extent)\u201d\u3001\u8bbe\u7f6eRAID stripe\u5927\u5c0f\u4e3a256KB\uff0c\u6240\u4ee5\u5b9e\u9645\u4e0a\u6211\u4eec\u5f88\u5c11\u906d\u9047\u8fd9\u4e9b\u6781\u7aef\u573a\u666f\u3002<\/p>\n<h5>3.5 \u6545\u969c\u6062\u590d<\/h5>\n<p>\u5bf9\u4e8e\u8fd0\u884c\u5728\u666e\u901a\u786c\u4ef6\u4e0a\u7684\u5927\u89c4\u6a21\u7cfb\u7edf\uff0c\u5bb9\u5fcd\u5404\u79cd\u7c7b\u578b\u7684\u6545\u969c\u662f\u5fc5\u987b\u7684\uff0c\u5305\u62ec\u786c\u76d8\u9a71\u52a8\u6545\u969c\u3001RAID\u63a7\u5236\u5668\u9519\u8bef\u3001\u4e3b\u677f\u9519\u8bef\u7b49\uff0cHaystack\u4e5f\u4e0d\u4f8b\u5916\u3002\u6211\u4eec\u7684\u5bf9\u7b56\u7531\u4e24\u4e2a\u90e8\u5206\u7ec4\u6210\u2014\u2014\u4e00\u4e2a\u4e3a\u4fa6\u6d4b\u3001\u4e00\u4e2a\u4e3a\u4fee\u590d\u3002<\/p>\n<p>\u4e3a\u4e86\u4e3b\u52a8\u627e\u5230\u6709\u95ee\u9898\u7684Store\u673a\u5668\uff0c\u6211\u4eec\u7ef4\u62a4\u4e86\u4e00\u4e2a\u540e\u53f0\u4efb\u52a1\uff0c\u79f0\u4e4b\u4e3apitchfork\uff0c\u5b83\u5468\u671f\u6027\u7684\u68c0\u67e5\u6bcf\u4e2aStore\u673a\u5668\u7684\u5065\u5eb7\u5ea6\u3002pitchfork\u8fdc\u7a0b\u7684\u6d4b\u8bd5\u5230\u6bcf\u53f0Store\u673a\u5668\u7684\u8fde\u63a5\uff0c\u68c0\u67e5\u5176\u6bcf\u4e2a\u5377\u6587\u4ef6\u7684\u53ef\u7528\u6027\uff0c\u5e76\u5c1d\u8bd5\u8bfb\u53d6\u6570\u636e\u3002\u5982\u679cpitchfork\u786e\u5b9a\u67d0\u53f0Store\u673a\u5668\u6ca1\u901a\u8fc7\u8fd9\u4e9b\u5065\u5eb7\u68c0\u67e5\uff0c\u5b83\u4f1a\u81ea\u52a8\u6807\u8bb0\u6b64\u53f0\u673a\u5668\u6d89\u53ca\u7684\u6240\u6709\u903b\u8f91\u5377\u4e3a\u53ea\u8bfb\u3002\u6211\u4eec\u7684\u5de5\u7a0b\u5e08\u5c06\u5728\u7ebf\u4e0b\u4eba\u5de5\u7684\u68c0\u67e5\u6839\u672c\u6545\u969c\u539f\u56e0\u3002<\/p>\n<p>\u4e00\u65e6\u786e\u8bca\uff0c\u6211\u4eec\u5c31\u80fd\u5feb\u901f\u7684\u89e3\u51b3\u95ee\u9898\u3002\u4e0d\u8fc7\u5728\u5c11\u6570\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u6267\u884c\u4e00\u4e2a\u66f4\u52a0\u4e25\u5389\u7684bulk\u540c\u6b65\u64cd\u4f5c\uff0c\u6b64\u64cd\u4f5c\u9700\u8981\u4f7f\u7528\u590d\u5236\u54c1\u4e2d\u7684\u5377\u6587\u4ef6\u91cd\u7f6e\u67d0\u4e2aStore\u673a\u5668\u7684\u6240\u6709\u6570\u636e\u3002Bulk\u540c\u6b65\u53d1\u751f\u7684\u51e0\u7387\u5f88\u5c0f\uff08\u6bcf\u4e2a\u6708\u51e0\u6b21\uff09\uff0c\u800c\u4e14\u8fc7\u7a0b\u6bd4\u8f83\u7b80\u5355\uff0c\u53ea\u662f\u6267\u884c\u5f88\u6162\u3002\u4e3b\u8981\u7684\u74f6\u9888\u5728\u4e8ebulk\u540c\u6b65\u7684\u6570\u636e\u91cf\u7ecf\u5e38\u4f1a\u8fdc\u8fdc\u8d85\u8fc7\u5355\u53f0Store\u673a\u5668NIC\u901f\u5ea6\uff0c\u5bfc\u81f4\u597d\u51e0\u4e2a\u5c0f\u65f6\u624d\u80fd\u6062\u590d\u3002\u6211\u4eec\u6b63\u79ef\u6781\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<h5>3.6 \u4f18\u5316<\/h5>\n<p>Haystack\u7684\u6210\u529f\u8fd8\u5f52\u529f\u4e8e\u51e0\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u7ec6\u8282\u4f18\u5316\u3002<\/p>\n<h5>3.6.1 \u538b\u7f29<\/h5>\n<p>\u538b\u7f29\u64cd\u4f5c\u662f\u76f4\u63a5\u5728\u7ebf\u6267\u884c\u7684\uff0c\u5b83\u80fd\u56de\u6536\u5df2\u5220\u9664\u7684\u3001\u91cd\u590d\u7684needle\u6240\u5360\u636e\u7684\u7a7a\u95f4\u3002Store\u673a\u5668\u538b\u7f29\u5377\u6587\u4ef6\u7684\u65b9\u5f0f\u662f\uff0c\u9010\u4e2a\u590d\u5236needle\u5230\u4e00\u4e2a\u65b0\u7684\u5377\u6587\u4ef6\uff0c\u5e76\u8df3\u8fc7\u4efb\u4f55\u91cd\u590d\u9879\u3001\u5df2\u5220\u9664\u9879\u3002\u5728\u538b\u7f29\u65f6\u5982\u679c\u63a5\u6536\u5230\u5220\u9664\u64cd\u4f5c\uff0c\u4e24\u4e2a\u5377\u6587\u4ef6\u90fd\u9700\u5904\u7406\u3002\u4e00\u65e6\u590d\u5236\u8fc7\u7a0b\u6267\u884c\u5230\u5377\u6587\u4ef6\u672b\u5c3e\uff0c\u6240\u6709\u5bf9\u6b64\u5377\u7684\u4fee\u6539\u64cd\u4f5c\u5c06\u88ab\u963b\u585e\uff0c\u65b0\u5377\u6587\u4ef6\u548c\u65b0\u5185\u5b58\u4e2d\u6620\u5c04\u5c06\u5bf9\u524d\u4efb\u6267\u884c\u539f\u5b50\u66ff\u6362\uff0c\u968f\u540e\u6062\u590d\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<h5>3.6.2 \u8282\u7701\u66f4\u591a\u5185\u5b58<\/h5>\n<p>\u4e0a\u9762\u63cf\u8ff0\u8fc7\uff0cStore\u673a\u5668\u4f1a\u5728\u5185\u5b58\u4e2d\u6620\u5c04\u4e2d\u7ef4\u62a4\u4e00\u4e2aflag\uff0c\u4f46\u662f\u76ee\u524d\u5b83\u53ea\u4f1a\u7528\u6765\u6807\u8bb0\u4e00\u4e2aneedle\u662f\u5426\u5df2\u5220\u9664\uff0c\u6709\u70b9\u6d6a\u8d39\u3002\u6240\u4ee5\u6211\u4eec\u901a\u8fc7\u8bbe\u7f6e\u504f\u79fb\u91cf\u4e3a0\u6765\u8868\u793a\u56fe\u7247\u5df2\u5220\u9664\uff0c\u7269\u7406\u4e0a\u6d88\u9664\u4e86\u8fd9\u4e2aflag\u3002\u53e6\u5916\uff0c\u6620\u5c04Value\u4e2d\u4e0d\u5305\u542bcookie\uff0c\u5f53needle\u4ece\u78c1\u76d8\u8bfb\u51fa\u4e4b\u540eStore\u624d\u4f1a\u8fdb\u884ccookie\u68c0\u67e5\u3002\u901a\u8fc7\u8fd9\u4e24\u4e2a\u6280\u672f\u51cf\u5c11\u4e8620%\u7684\u5185\u5b58\u5360\u7528\u3002<\/p>\n<p>\u5f53\u524d\uff0cHaystack\u5e73\u5747\u4e3a\u6bcf\u4e2a\u56fe\u7247\u4f7f\u752810byte\u7684\u5185\u5b58\u3002\u6bcf\u4e2a\u4e0a\u4f20\u7684\u56fe\u7247\u5bf9\u5e944\u5f20\u526f\u672c\uff0c\u5b83\u4eec\u5171\u7528\u540c\u4e00\u4e2akey\uff08\u536064bits\uff09\uff0calternate keys\u4e0d\u540c\uff08\u536032bits\uff09\uff0csize\u4e0d\u540c\uff08\u536016bits\uff09\uff0c\u76ee\u524d\u5360\u7528(64+(32+16)*4)\/8=32\u4e2abytes\u3002\u53e6\u5916\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u526f\u672c\uff0cHaystack\u5728\u7528hash table\u7b49\u7ed3\u6784\u65f6\u9700\u8981\u6d88\u8017\u989d\u5916\u76842\u4e2abytes\uff0c\u6700\u7ec8\u603b\u91cf\u4e3a\u4e00\u5f20\u56fe\u7247\u76844\u4efd\u526f\u672c\u5171\u5360\u752840bytes\u3002\u4f5c\u4e3a\u5bf9\u6bd4\uff0c\u4e00\u4e2axfs_inode_t\u7ed3\u6784\u5728Linux\u4e2d\u9700\u5360\u7528536bytes\u3002<\/p>\n<h5>3.6.3 \u6279\u91cf\u4e0a\u4f20<\/h5>\n<p>\u78c1\u76d8\u5728\u6267\u884c\u5927\u578b\u7684\u3001\u8fde\u7eed\u7684\u5199\u65f6\u6027\u80fd\u8981\u4f18\u4e8e\u5927\u91cf\u5c0f\u578b\u7684\u968f\u673a\u5199\uff0c\u6240\u4ee5\u6211\u4eec\u5c3d\u91cf\u5c06\u76f8\u5173\u5199\u64cd\u4f5c\u6346\u7ed1\u6279\u91cf\u6267\u884c\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u5f88\u591a\u7528\u6237\u90fd\u4f1a\u4e0a\u4f20\u6574\u4e2a\u76f8\u518c\u5230Facebook\uff0c\u800c\u4e0d\u662f\u9891\u7e41\u4e0a\u4f20\u5355\u4e2a\u56fe\u7247\u3002\u56e0\u6b64\u53ea\u9700\u505a\u4e00\u4e9b\u5de7\u5999\u7684\u5b89\u6392\u5c31\u53ef\u4ee5\u6346\u7ed1\u6279\u91cfupload\uff0c\u5b9e\u73b0\u5927\u578b\u3001\u8fde\u7eed\u7684\u5199\u64cd\u4f5c\u3002<\/p>\n<p>\u7ae0\u82824\u30015\u30016\u662f\u5b9e\u9a8c\u548c\u603b\u7ed3\u7b49\u5185\u5bb9\uff0c\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u4e86\u3002<\/p>\n<p>\u3010\u6269\u5c55\u9605\u8bfb\u3011<\/p>\n<p>\u63d0\u5230CDN\u548c\u5206\u5e03\u5f0f\u6587\u4ef6\u5b58\u50a8\u5c31\u4e0d\u5f97\u4e0d\u63d0\u5230\u6dd8\u5b9d\uff0c\u5b83\u7684\u5546\u54c1\u56fe\u7247\u4e0d\u4f1a\u5c11\u4e8eFacebook\u7684\u4e2a\u4eba\u7167\u7247\u3002\u5176\u8457\u540d\u7684CDN+TFS\u7684\u89e3\u51b3\u65b9\u6848\u7531\u4e8e\u4e3a\u516c\u53f8\u8282\u7701\u4e86\u5de8\u989d\u7684\u9884\u7b97\u5f00\u652f\u800c\u83b7\u5f97\u521b\u65b0\u5927\u5956\uff0c\u56e2\u961f\u6210\u5458\u4e5f\u5f97\u5230\u4e0d\u83f2\u7684\u5956\u91d1\uff08\u7fa1\u6155\u5ac9\u5992\u6068\uff09\u3002\u6dd8\u5b9d\u7684CDN\u6280\u672f\u505a\u4e86\u975e\u5e38\u591a\u7684\u6280\u672f\u521b\u65b0\u548c\u7a81\u7834\uff0c\u4e0d\u8fc7\u5e76\u975e\u672c\u6587\u8303\u7574\uff0c\u63a5\u4e0b\u6765\u7684\u8ba8\u8bba\u4e3b\u8981\u662f\u9488\u5bf9Haystack\u4e0eTFS\u5728\u5b58\u50a8\u3001\u68c0\u7d22\u73af\u8282\u7684\u5bf9\u6bd4\uff0c\u5e76\u5c1d\u8bd5\u63d0\u53d6\u51fa\u6b64\u7c7b\u573a\u666f\u5e38\u89c1\u7684\u6280\u672f\u96be\u70b9\u3002\uff08\u8bd1\u8005\u5bf9TFS\u7684\u7406\u89e3\u4ec5\u9650\u4e8e\u4ecb\u7ecd\u6587\u6863\uff0c\u82e5\u6709\u9519\u8bef\u671b\u8bfb\u8005\u77eb\u6b63\uff09<\/p>\n<p>\u6dd8\u5b9dCDN\u3001TFS\u7684\u4ecb\u7ecd\u8bf7\u79fb\u6b65<\/p>\n<p><a href=\"http:\/\/www.infoq.com\/cn\/presentations\/zws-taobao-image-store-cdn\" rel=\"nofollow\" target=\"_blank\">http:\/\/www.infoq.com\/cn\/presentations\/zws-taobao-image-store-cdn<\/a><\/p>\n<p><a href=\"http:\/\/tfs.taobao.org\/index.html\" rel=\"nofollow\" target=\"_blank\">http:\/\/tfs.taobao.org\/index.html\u00a0<\/a><\/p>\n<p>\u6ce8\u610f\uff1a\u4e0b\u6587\u4e2d\u5f88\u591a\u672f\u8bed\uff08\u6bd4\u5982\u5e94\u7528\u5143\u6570\u636e\u3001Store\u3001\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u7b49\uff0c\u90fd\u662f\u57fa\u4e8e\u672c\u7bc7\u8bba\u6587\u7684\u4e0a\u4e0b\u6587\uff0c\u8bf7\u52ff\u6df7\u6dc6\uff09<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/9.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/9.jpg\" \/><\/p>\n<p>\u4e0a\u56fe\u662f\u6574\u4e2aCDN+TFS\u89e3\u51b3\u65b9\u6848\u7684\u5168\u8c8c\uff0c\u5bf9\u5e94\u672c\u6587\u5c31\u662f\u56fe3\u3002CDN\u5728\u524d\u4e09\u5c42\u4e0a\u5b9e\u73b0\u4e86\u5404\u79cd\u521b\u65b0\u548c\u6280\u672f\u7a81\u7834\uff0c\u4e0d\u8fc7\u5e76\u975e\u672c\u6587\u7126\u70b9\uff0c\u8fd9\u91cc\u4e3b\u8981\u9488\u5bf9\u7b2c\u56db\u5c42Storage\uff08\u6dd8\u5b9d\u7684\u5206\u5e03\u5f0f\u6587\u4ef6\u7cfb\u7edfTFS\uff09\uff0c\u5bf9\u6bd4Haystack\uff0c\u770b\u5176\u662f\u5426\u4e5f\u89e3\u51b3\u4e86long tail\u95ee\u9898\u3002\u4e0b\u9762\u662fTFS\u7684\u67b6\u6784\u6982\u89c8\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/10.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/10.jpg\" \/><\/p>\n<p>\u4ece\u7c97\u7c92\u5ea6\u7684\u5b8f\u89c2\u89c6\u89d2\u6765\u770b\uff0cTFS\u4e0eHaystack\u7684\u6700\u5927\u533a\u522b\u5c31\u662f\uff1a TFS\u53eacare\u5b58\u50a8\u5c42\u9762\uff0c\u5b83\u6ca1\u6709Haystack Cache\u7ec4\u4ef6\uff1bHaystack\u671f\u671b\u63d0\u4f9b\u7684\u662f\u4ece\u6d4f\u89c8\u5668\u3001\u5230CDN\u3001\u5230\u6700\u7ec8\u5b58\u50a8\u7684\u4e00\u6574\u5957\u89e3\u51b3\u65b9\u6848\uff0c\u67b6\u6784\u5b9a\u4f4d\u7a0d\u6709\u4e0d\u540c\uff0cHaystack\u4e5f\u662f\u4e13\u95e8\u4e3a\u8fd9\u79cd\u573a\u666f\u4e0b\u7684\u56fe\u7247\u670d\u52a1\u6240\u5b9a\u5236\u7684\uff0c\u505a\u4e86\u5f88\u591a\u7cbe\u7ec6\u7684\u4f18\u5316\uff1bTFS\u7684\u76ee\u6807\u662f\u901a\u7528\u5206\u5e03\u5f0f\u6587\u4ef6\u5b58\u50a8\uff0c\u9664\u4e86CDN\u8fd8\u4f1a\u652f\u6301\u5176\u4ed6\u5404\u79cd\u573a\u666f\u3002<\/p>\n<p>\u5230\u5e95\u662f\u5b9a\u5236\u4e00\u6574\u5957\u4f18\u5316\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u8fd8\u662f\u4f7f\u7528\u901a\u7528\u5206\u5e03\u5f0f\u6587\u4ef6\u5b58\u50a8\u5e73\u53f0\u5f3a\u5f3a\u8054\u624b\uff1fFacebook\u7684\u5de5\u7a0b\u5e08\u4e5f\u66fe\u7ea0\u7ed3\u8fc7\uff08\u7ae0\u82822.3\uff09\uff0c\u8fd9\u4e2a\u6ca1\u6709\u6807\u51c6\u7b54\u6848\uff0c\u5404\u6709\u6240\u957f\uff0c\u89c6\u60c5\u51b5\u53bb\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u6848\u5427\u3002<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u4ee5\u672c\u6587\u4e2d\u5173\u6ce8\u7684\u4e00\u4e9b\u96be\u70b9\u6765\u5bf9\u6bd4\u4e00\u4e0b\u53cc\u65b9\u7684\u5b9e\u73b0\uff1a<\/p>\n<p>1 \u5b58\u50a8\u673a\u5668\u4e0a\u7684\u6587\u4ef6\u7ed3\u6784\u3001\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u5bf9\u7b56<\/p>\n<p>Haystack\u7684\u673a\u5668\u4e0a\u7ef4\u62a4\u4e86\u5c11\u91cf\u7684\u5927\u578b\u7269\u7406\u5377\u6587\u4ef6\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u7cfb\u5217needle\u6765\u5b58\u50a8\u5c0f\u6587\u4ef6\uff0c\u540c\u65f6needle\u7684\u6587\u4ef6\u7cfb\u7edf\u5143\u6570\u636e\u88ab\u5168\u91cf\u7f13\u5b58\u3001\u6301\u4e45\u5316\u201c\u5b58\u6863\u201d\u3002<\/p>\n<p>\u5728TFS\u4e2d\uff08\u540e\u6587\u4e3a\u6e05\u6670\u8d77\u89c1\uff0c\u5f15\u7528TFS\u6587\u732e\u7684\u5185\u5bb9\u90fd\u7528\u6dd8\u5b9d\u6700\u7231\u7684\u6a59\u8272\u5c55\u793a\uff09\uff1a<\/p>\n<p>\u201c\u2026\u2026\u5728TFS\u4e2d\uff0c\u5c06\u5927\u91cf\u7684\u5c0f\u6587\u4ef6(\u5b9e\u9645\u7528\u6237\u6587\u4ef6)\u5408\u5e76\u6210\u4e3a\u4e00\u4e2a\u5927\u6587\u4ef6\uff0c\u8fd9\u4e2a\u5927\u6587\u4ef6\u79f0\u4e3a\u5757(Block)\u3002TFS\u4ee5Block\u7684\u65b9\u5f0f\u7ec4\u7ec7\u6587\u4ef6\u7684\u5b58\u50a8\u2026\u2026\u201d<\/p>\n<p>\u201c\u2026\u2026!DataServer\u8fdb\u7a0b\u4f1a\u7ed9Block\u4e2d\u7684\u6bcf\u4e2a\u6587\u4ef6\u5206\u914d\u4e00\u4e2aID(File ID\uff0c\u8be5ID\u5728\u6bcf\u4e2aBlock\u4e2d\u552f\u4e00)\uff0c\u5e76\u5c06\u6bcf\u4e2a\u6587\u4ef6\u5728Block\u4e2d\u7684\u4fe1\u606f\u5b58\u653e\u5728\u548cBlock\u5bf9\u5e94\u7684Index\u6587\u4ef6\u4e2d\u3002\u8fd9\u4e2aIndex\u6587\u4ef6\u4e00\u822c\u90fd\u4f1a\u5168\u90e8load\u5728\u5185\u5b58\u2026\u2026\u201d<\/p>\n<p>\u770b\u6765\u9762\u5bf9\u53ef\u601c\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5927\u5bb6\u90fd\u4e0d\u5fcd\u5fc3\u628a\u6d77\u91cf\u7684\u5c0f\u6587\u4ef6\u76f4\u63a5\u653e\u5230\u5b83\u7684\u6587\u4ef6\u7cfb\u7edf\u4e0a\uff0c\u5408\u5e76\u6210super block\uff0c\u7ef4\u62a4super block\u4e2d\u5404entry\u7684\u5143\u6570\u636e\u548c\u7d22\u5f15\u4fe1\u606f\uff08\u5e76\u5168\u91cf\u7f13\u5b58\uff09\uff0c\u624d\u662f\u738b\u9053\u3002\u8fd9\u91ccTFS\u7684Block\u5e94\u8be5\u5bf9\u5e94\u5230Haystack\u4e2d\u7684\u4e00\u4e2a\u7269\u7406\u5377\u3002<\/p>\n<p>2 \u5206\u5e03\u5f0f\u534f\u8c03\u8c03\u5ea6\u3001\u5e94\u7528\u5143\u6570\u636e\u7b56\u7565<\/p>\n<p>Haystack\u5728\u63a5\u6536\u5230\u8bfb\u5199\u8bf7\u6c42\u65f6\uff0c\u4f9d\u9760Directory\u5206\u6790\u5e94\u7528\u5143\u6570\u636e\uff0c\u518d\u7ed3\u5408\u4e00\u5b9a\u7b56\u7565\uff08\u5982\u8d1f\u8f7d\u5747\u8861\u3001\u5bb9\u91cf\u3001\u8fd0\u7ef4\u3001\u53ea\u8bfb\u3001\u53ef\u5199\u7b49\uff09\uff0c\u51b3\u5b9a\u8bf7\u6c42\u88ab\u53d1\u9001\u5230\u54ea\u53f0Store\u673a\u5668\uff0c\u5e76\u5411Store\u63d0\u4f9b\u8db3\u591f\u7684\u5b58\u50a8\u6216\u68c0\u7d22\u4fe1\u606f\u3002Directory\u8d1f\u8d23\u4e86\u6574\u4f53\u5206\u5e03\u5f0f\u73af\u5883\u7684\u534f\u8c03\u8c03\u5ea6\u3001\u5e94\u7528\u5143\u6570\u636e\u7ba1\u7406\u804c\u80fd\uff0c\u5e76\u57fa\u4e8e\u6b64\u5e2e\u52a9\u5b9e\u73b0\u4e86\u7cfb\u7edf\u7684\u53ef\u6269\u5c55\u6027\u3001\u5bb9\u9519\u6027\u3002<\/p>\n<p>\u5728TFS\u4e2d\uff1a<\/p>\n<p>\u201c\u2026\u2026!NameServer\u4e3b\u8981\u529f\u80fd\u662f: \u7ba1\u7406\u7ef4\u62a4Block\u548c!DataServer\u76f8\u5173\u4fe1\u606f,\u5305\u62ec!DataServer\u52a0\u5165\uff0c\u9000\u51fa, \u5fc3\u8df3\u4fe1\u606f, block\u548c!DataServer\u7684\u5bf9\u5e94\u5173\u7cfb\u5efa\u7acb\uff0c\u89e3\u9664\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u5757\u4f1a\u5728!DataServer\u4e0a\u5b58\u5728\uff0c \u4e3b!NameServer\u8d1f\u8d23Block\u7684\u521b\u5efa\uff0c\u5220\u9664\uff0c\u590d\u5236\uff0c\u5747\u8861\uff0c\u6574\u7406\u2026\u2026\u201d<\/p>\n<p>\u201c\u2026\u2026\u6bcf\u4e00\u4e2aBlock\u5728\u6574\u4e2a\u96c6\u7fa4\u5185\u62e5\u6709\u552f\u4e00\u7684\u7f16\u53f7\uff0c\u8fd9\u4e2a\u7f16\u53f7\u662f\u7531NameServer\u8fdb\u884c\u5206\u914d\u7684\uff0c\u800cDataServer\u4e0a\u5b9e\u9645\u5b58\u50a8\u4e86\u8be5Block\u3002\u5728!NameServer\u8282\u70b9\u4e2d\u5b58\u50a8\u4e86\u6240\u6709\u7684Block\u7684\u4fe1\u606f\u2026\u2026\u201d<\/p>\n<p>TFS\u4e2d\u4e0eDirectory\u5bf9\u5e94\u7684\u5c31\u662fNameServer\u4e86\uff0c\u804c\u8d23\u5927\u540c\u5c0f\u5f02\uff0c\u5c31\u662f\u5206\u5e03\u5f0f\u534f\u8c03\u8c03\u5ea6\u548c\u5e94\u7528\u5143\u6570\u636e\u5206\u914d\u7ba1\u7406\uff0c\u5e76\u57fa\u4e8e\u6b64\u5b9e\u73b0\u7cfb\u7edf\u7684\u5e73\u6ed1\u6269\u5bb9\u3001\u6545\u969c\u5bb9\u5fcd\u3002\u4e0b\u9762\u4e13\u95e8\u8ba8\u8bba\u4e00\u4e0b\u8fd9\u4e24\u4e2a\u91cd\u8981\u7279\u6027\u3002<\/p>\n<p>3 \u6269\u5c55\u6027<\/p>\n<p>Haystack\u548cTFS\u90fd\u57fa\u4e8e\uff08\u5206\u5e03\u5f0f\u534f\u8c03\u8c03\u5ea6+\u5143\u6570\u636e\u5206\u914d\u7ba1\u7406\uff09\u5b9e\u73b0\u4e86\u975e\u5e38\u4f18\u96c5\u7684\u53ef\u6269\u5c55\u65b9\u6848\u3002\u6211\u4eec\u5148\u56de\u987e\u4e00\u4e0b\u4f20\u7edf\u6269\u5c55\u6027\u65b9\u6848\u4e2d\u7684\u90a3\u4e9b\u7b80\u5355\u7c97\u66b4\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u6700\u7b80\u5355\u6700\u7c97\u66b4\u7684\u573a\u666f\uff1a<\/p>\n<p>\u73b0\u5728\u6709\u6d77\u91cf\u7684\u6570\u636e\uff0c\u6bd4\u5982data [key : value]\uff0c\u6709100\u53f0\u673a\u5668\uff0c\u901a\u8fc7\u4e00\u79cd\u7b56\u7565\u8ba9\u8fd9\u4e9b\u6570\u636e\u80fd\u8d1f\u8f7d\u5747\u8861\u7684\u53d1\u7ed9\u5404\u53f0\u673a\u5668\u3002\u7b56\u7565\u53ef\u4ee5\u662f\u8fd9\u6837\uff0cint index=Math.abs(key.hashCode)%100\uff0c\u8fd9\u5c31\u5f97\u5230\u4e86\u4e00\u4e2a\u552f\u4e00\u7684\u3001\u786e\u5b9a\u7684\u3001[0,99]\u7684\u5e8f\u53f7\uff0c\u6309\u6b64\u5e8f\u53f7\u53d1\u7ed9\u5bf9\u5e94\u7684\u67d0\u53f0\u673a\u5668\uff0c\u6700\u7ec8\u80fd\u8fbe\u5230\u8d1f\u8f7d\u5747\u8861\u7684\u6548\u679c\u3002\u6b64\u65b9\u6848\u7684\u7c97\u66b4\u663e\u800c\u6613\u89c1\uff0c\u5f53\u6211\u4eec\u65b0\u589e\u673a\u5668\u540e\uff08\u6bd4\u5982100\u53d8\u6210130\uff09\uff0c\u5927\u90e8\u5206\u8001\u6570\u636e\u7684key\u6267\u884c\u6b64\u7b56\u7565\u540e\u5f97\u5230\u7684index\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\u5bf9\u5b83\u4eec\u7684\u68c0\u7d22\u90fd\u4f1a\u53d1\u5f80\u9519\u8bef\u7684\u673a\u5668\uff0c\u627e\u4e0d\u5230\u6570\u636e\u3002<\/p>\n<p>\u7a0d\u5fae\u6539\u8fdb\u7684\u573a\u666f\u662f\uff1a<\/p>\n<p>\u73b0\u5728\u6709\u6d77\u91cf\u7684\u6570\u636e\uff0c\u6bd4\u5982data [key : value]\uff0c\u6211\u5047\u60f3\u81ea\u5df1\u662f\u9ad8\u5bcc\u5e05\uff0c\u6709\u4e00\u4e07\u53f0\u673a\u5668\uff0c\u540c\u6837\u6309\u7167\u4e0a\u8ff0\u7684\u7b56\u7565\u8fdb\u884c\u8def\u7531\u3002\u4f46\u662f\u6211\u53ea\u6709100\u53f0\u673a\u5668\uff0c\u8fd9\u4e00\u4e07\u53f0\u662f\u5047\u60f3\u7684\uff0c\u600e\u4e48\u529e\uff1f\u5148\u7ed9\u5b83\u4eec\u4e00\u4e2a\u79f0\u53f7\uff0c\u53eb\u865a\u62df\u8282\u70b9\uff08\u7b80\u79f0vnode\uff0cvnode\u7684\u5e8f\u53f7\u7b80\u79f0\u4e3avnodeId\uff09\uff0c\u7136\u540e\u60f3\u529e\u6cd5\u5c06vnode\u4e0e\u771f\u5b9e\u673a\u5668\u5efa\u7acb\u591a\u5bf9\u4e00\u6620\u5c04\u5173\u7cfb\uff08\u6bcf\u4e2a\u771f\u5b9e\u673a\u5668\u4e0a100\u4e2avnode\uff09\uff0c\u8fd9\u4e2a\u529e\u6cd5\u53ef\u4ee5\u662f\u67d0\u79cd\u7b56\u7565\uff0c\u6bd4\u5982\u6545\u6280\u91cd\u65bd\u5bf9vnodeId%100\u5f97\u5230[0,99]\u7684\u673a\u5668\u5e8f\u53f7\uff0c\u6216\u8005\u5728\u6570\u636e\u5e93\u4e2d\u5efa\u51e0\u5f20\u8868\u7ef4\u62a4\u4e00\u4e0b\u8fd9\u4e2a\u591a\u5bf9\u4e00\u7684\u6620\u5c04\u5173\u7cfb\u3002\u5728\u8def\u7531\u65f6\uff0c\u5148\u6309\u8001\u529e\u6cd5\u5f97\u5230vnodeId\uff0c\u518d\u6267\u884c\u4e00\u6b21\u6620\u5c04\uff0c\u627e\u5230\u771f\u5b9e\u673a\u5668\u3002\u8fd9\u4e2a\u65b9\u6848\u8fd8\u9700\u8981\u4e00\u4e2a\u67b6\u6784\u5047\u8bbe\uff1a\u6211\u7684\u7cfb\u7edf\u89c4\u6a21\u57285\u5e74\u5185\u90fd\u4e0d\u9700\u8981\u4e0a\u6da8\u5230\u4e00\u4e07\u53f0\u673a\u5668\uff085\u5e74\u5dee\u4e0d\u591a\u4e86\uff0c\u50cf\u6211\u7b49\u7801\u519c\u4f30\u8ba1\u4e00\u8f88\u5b50\u4e5f\u73a9\u4e0d\u4e86\u4e00\u4e07\u53f0\u673a\u5668\u7684\u96c6\u7fa4\u5427\uff09\uff0c\u56e0\u6b6410000\u8fd9\u4e2a\u6570\u5b57\u201c\u6c38\u8fdc\u201d\u4e0d\u4f1a\u53d8\uff0c\u8fd9\u5c31\u4fdd\u8bc1\u4e86\u4e00\u4e2akey\u6c38\u8fdc\u5bf9\u5e94\u67d0\u4e2avnodeId\uff0c\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8\u3002\u7136\u540e\u5728\u6269\u5bb9\u65f6\uff0c\u6211\u4eec\u6539\u53d8\u7684\u662fvnode\u4e0e\u771f\u5b9e\u673a\u5668\u7684\u6620\u5c04\u5173\u7cfb\uff0c\u4f46\u662f\u6b64\u6620\u5c04\u5173\u7cfb\u4e00\u6539\uff0c\u4e5f\u4f1a\u4e0d\u53ef\u907f\u514d\u7684\u5bfc\u81f4\u6570\u636e\u547d\u4e2d\u5931\u8d25\uff0c\u56e0\u4e3a\u5fc5\u7136\u4f1a\u4ea7\u751f\u8fd9\u6837\u7684\u73b0\u8c61\uff1a\u67d0\u4e2avnodeId\uff08v1\uff09\u539f\u5148\u662f\u5bf9\u5e94\u673a\u5668A\u7684\uff0c\u73b0\u5728\u53d8\u6210\u4e86\u673a\u5668B\u3002\u4f46\u662f\u76f8\u6bd4\u4e4b\u524d\u7684\u65b9\u6848\uff0c\u73b0\u5728\u5df2\u7ecf\u597d\u5f88\u591a\u4e86\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8fd0\u7ef4\u624b\u6bb5\u5148\u963b\u585e\u4f4f\u5bf9v1\u7684\u8bfb\u5199\u8bf7\u6c42\uff0c\u7136\u540e\u6267\u884c\u6570\u636e\u8fc1\u79fb\uff08\u4ee5\u5df2\u77e5\u7684vnode\u4e3a\u7c92\u5ea6\uff0c\u800c\u4e0d\u662f\u5343\u5343\u4e07\u4e07\u4e2a\u672a\u77e5\u7684data\uff0c\u8fd9\u79cd\u8fc1\u79fb\u64cd\u4f5c\u8fd8\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\uff09\uff0c\u8fc1\u79fb\u5b8c\u6bd5\u540e\u65b0\u673a\u5668\u5f00\u59cb\u63a5\u6536\u8bf7\u6c42\u3002\u505a\u7684\u66f4\u597d\u4e00\u70b9\uff0c\u53ef\u4ee5\u4e0d\u963b\u585e\u8bf7\u6c42\uff0c\u60f3\u529e\u6cd5\u505a\u70b9\u5bb9\u9519\u5904\u7406\u548c\u5199\u540c\u6b65\u4e4b\u7c7b\u7684\uff0c\u53ef\u4ee5\u5728\u7ebf\u65e0\u75db\u7684\u5b8c\u6210\u8fc1\u79fb\u3002<\/p>\n<p>\u4e0a\u9762\u4e24\u4e2a\u8001\u65b9\u6848\u8fd8\u53ef\u4ee5\u52a0\u4e0a\u4e00\u81f4\u6027Hash\u7b49\u7b56\u7565\u6765\u5c3d\u91cf\u907f\u514d\u6570\u636e\u547d\u4e2d\u5931\u8d25\u548c\u6570\u636e\u8fc1\u79fb\u3002\u4f46\u662f\u59cb\u7ec8\u9003\u907f\u4e0d\u4e86\u8fd9\u6837\u4e00\u4e2a\u516c\u5f0f\uff1a<\/p>\n<p>int machine_id=function(data.key , x)<\/p>\n<p>machine_id\u6307\u6700\u7ec8\u8def\u7531\u5230\u54ea\u53f0\u673a\u5668\uff0cfunction\u4ee3\u8868\u6211\u4eec\u7684\u8def\u7531\u7b56\u7565\u51fd\u6570\uff0cdata.key\u5c31\u662f\u6570\u636e\u7684key\uff08\u6570\u636eID\u4e4b\u7c7b\u7684\uff09\uff0cx\u5728\u7b2c\u4e00\u4e2a\u65b9\u6848\u91cc\u5c31\u662f\u673a\u5668\u6570\u91cf100\uff0c\u5728\u7b2c\u4e8c\u4e2a\u65b9\u6848\u91cc\u5c31\u662fvnode\u6570\u91cf+(vnode\u4e0e\u673a\u5668\u7684\u6620\u5c04\u5173\u7cfb)\u3002\u5728\u8fd9\u4e2a\u516c\u5f0f\u91cc\uff0c\u6c38\u8fdc\u5b58\u5728\u4e86x\u8fd9\u4e2a\u672a\u77e5\u6570\uff0c\u4e00\u65e6\u5b83\u98ce\u5439\u8349\u52a8\uff0cfunction\u7684\u6267\u884c\u7ed3\u679c\u5c31\u53ef\u80fd\u6539\u53d8\uff0c\u6240\u4ee5\u5b83\u9003\u907f\u4e0d\u4e86\u547d\u4e2d\u5931\u8d25\u3002<\/p>\n<p>\u53ea\u6709\u5f53\u516c\u5f0f\u53d8\u6210\u4e0b\u9762\u8fd9\u4e2a\uff0c\u624d\u80fd\u7edd\u5bf9\u907f\u514d\uff1a<\/p>\n<p>Map&lt;data.key,final machine_id&gt; map = xxx;<\/p>\n<p>int machine_id=map.get(data.key);<\/p>\n<p>\u6ce8\u610fmap\u53ea\u662f\u4e2a\u7406\u8bba\u4e0a\u7684\u7ed3\u6784\uff0c\u8fd9\u91cc\u53ea\u662f\u7b80\u5355\u7684\u4f2a\u4ee3\u7801\uff0c\u5e76\u4e0d\u5f3a\u5236\u5b83\u662f\u4e2a\u7b80\u5355\u7684&lt;key-value&gt;\u7ed3\u6784\uff0c\u5b83\u7684\u7ed3\u6784\u53ef\u80fd\u4f1a\u66f4\u590d\u6742\uff0c\u4f46\u662f\u65e0\u8bba\u600e\u4e48\u590d\u6742\uff0c\u6b64map\u90fd\u771f\u5b9e\u7684\u3001\u660e\u786e\u7684\u5b58\u5728\uff0c\u5176\u6548\u679c\u90fd\u662f\u2014\u2014\u7528data.key\u5c31\u80fd\u6620\u5c04\u5230machine_id\uff0c\u627e\u5230\u76ee\u6807\u673a\u5668\uff0c\u4e0d\u7ba1\u662f\u76f4\u63a5\uff0c\u8fd8\u662f\u95f4\u63a5\uff0c\u53cd\u6b63\u4e0d\u662f\u7528\u4e00\u4e2afunction\u53bb\u52a8\u6001\u8ba1\u7b97\u5f97\u5230\u3002map\u91cc\u7684final\u4e0d\u7b26\u5408\u8bed\u6cd5\uff0c\u52a0\u5728\u8fd9\u91cc\u662f\u60f3\u5f3a\u8c03\uff0c\u6b64map\u4e00\u65e6\u4e3a\u67d0\u4e2adata.key\u8bbe\u7f6e\u4e86machine_id\uff0c\u5c31\u6c38\u4e0d\u6539\u53d8\uff08\u8d77\u7801\u4e0d\u4f1a\u56e0\u4e3a\u65e5\u5e38\u6269\u5bb9\u800c\u6539\u53d8\uff09\u3002\u5f53\u589e\u52a0\u673a\u5668\u65f6\uff0c\u6b64map\u7684\u5df2\u6709\u503c\u4e5f\u4e0d\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u8fd9\u6837\u4e00\u4e2a\u6ca1\u6709\u672a\u77e5\u6570x\u7684\u516c\u5f0f\uff0c\u624d\u80fd\u4fdd\u8bc1\u65b0\u8001\u6570\u636e\u6765\u4e86\u90fd\u80fd\u6839\u636ekey\u62ff\u5230\u4e00\u4e2a\u6c38\u8fdc\u4e0d\u53d8\u7684machine_id\uff0c\u6c38\u8fdc\u547d\u4e2d\u6210\u529f\u3002<\/p>\n<p>\u56e0\u6b64\u6211\u4eec\u5f97\u51fa\u8fd9\u6837\u4e00\u4e2a\u7ed3\u8bba\uff0c\u53ea\u8981\u62e5\u6709\u8fd9\u6837\u4e00\u4e2amap\uff0c\u7cfb\u7edf\u5c31\u80fd\u62e5\u6709\u975e\u5e38\u4f18\u96c5\u5e73\u6ed1\u7684\u53ef\u6269\u5c55\u6f5c\u529b\u3002\u5f53\u7cfb\u7edf\u6269\u5bb9\u65f6\uff0c\u8001\u7684\u6570\u636e\u4e0d\u4f1a\u547d\u4e2d\u5931\u8d25\uff0c\u5728\u5206\u5e03\u5f0f\u534f\u8c03\u8c03\u5ea6\u7684\u4fdd\u8bc1\u4e0b\uff0c\u65b0\u7684\u589e\u91cf\u6570\u636e\u4f1a\u66f4\u503e\u5411\u4e8e\u5199\u5165\u65b0\u673a\u5668\uff0c\u6574\u4e2a\u96c6\u7fa4\u7684\u8d1f\u8f7d\u4f1a\u9010\u6e10\u5747\u8861\u3002<\/p>\n<p>\u5f88\u663e\u7136Haystack\u548cTFS\u90fd\u505a\u5230\u4e86\uff0c\u4e0b\u9762\u5ffd\u7565\u5176\u4ed6\u7ec6\u8282\u95ee\u9898\uff0c\u7740\u91cd\u8ba8\u8bba\u4e00\u4e0b\u5b83\u4eec\u662f\u5982\u4f55\u88c5\u5907\u4e0a\u8fd9\u4e2amap\u7684\u3002<\/p>\n<p>\u8bfb\u8005\u56de\u987e\u4e00\u4e0b3.2\u7ae0\u8282\u7559\u4e0b\u7684\u90a3\u4e2a\u7591\u60d1\u2014\u2014\u539f\u59cbURL\u4e2d\u5230\u5e95\u5305\u542b\u4ec0\u4e48\u4fe1\u606f\uff0c\u662f\u4e0d\u662f\u53ea\u6709\u56fe\u7247ID\uff1fDirectory\u5230\u5e95\u9700\u4e0d\u9700\u8981\u7ef4\u62a4\u56fe\u7247ID\u5230\u903b\u8f91\u5377\u7684\u6620\u5c04\uff1f<\/p>\n<p>\u8fd9\u4e2a\u201c\u56fe\u7247ID\u5230\u903b\u8f91\u5377\u7684\u6620\u5c04\u201d\uff0c\u5c31\u662f\u6211\u4eec\u9700\u8981\u7684map\uff0c\u7528\u56fe\u7247ID\uff08data.key\uff09\u80fdget\u5230\u903b\u8f91\u5377ID\uff08\u6b64\u503c\u662fupload\u65f6\u5c31\u660e\u786e\u5206\u914d\u7684\uff0c\u4e0d\u4f1a\u6539\u53d8\uff09\uff0c\u518d\u95f4\u63a5\u4ece\u201c\u903b\u8f91\u5377\u5230\u7269\u7406\u5377\u6620\u5c04\u201d\u4e2d\u5c31\u80fdget\u5230\u76ee\u6807Store\u673a\u5668\uff1b\u65e0\u8bba\u662f\u65b0\u589e\u903b\u8f91\u5377\u8fd8\u662f\u65b0\u589e\u7269\u7406\u5377\uff0c\u201c\u56fe\u7247ID\u5230\u903b\u8f91\u5377\u7684\u6620\u5c04\u201d\u4e2d\u7684\u5df2\u6709\u503c\u90fd\u53ef\u4ee5\u4e0d\u53d7\u5f71\u54cd\u3002\u8fd9\u4e9b\u90fd\u7b26\u5408map\u7684\u884c\u4e3a\u5b9a\u4e49\u3002<\/p>\n<p>Haystack\u4e5f\u56e0\u6b64\uff0c\u5177\u5907\u4e86\u5341\u5206\u4f18\u96c5\u5e73\u6ed1\u7684\u53ef\u6269\u5c55\u80fd\u529b\u3002\u4f46\u662f\u8bd1\u8005\u63d0\u5230\u7684\u7591\u60d1\u5e76\u6ca1\u6709\u89e3\u7b54\u2014\u2014\u201c\u8fd9\u4e2a\u6620\u5c04\uff08\u56fe\u7247ID\u5230\u903b\u8f91\u5377\u7684\u6620\u5c04\uff09\u7684\u6570\u636e\u91cf\u4e0d\u80fd\u5ffd\u7565\u4e0d\u8ba1\uff0c\u8bba\u6587\u4e5f\u4e0d\u8be5\u4e00\u7b14\u5e26\u8fc7\u201d<\/p>\n<p>\u4f5c\u8005\u63d0\u5230\u8fc7memcache\uff0c\u4e5f\u8bb8\u8fd9\u5c31\u662f\u76f8\u5173\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u6b64\u6570\u636e\u867d\u7136\u4e0d\u5c0f\uff0c\u4f46\u662f\u4e5f\u6ca1\u5927\u5230\u671b\u800c\u751f\u754f\u7684\u5730\u6b65\u3002\u4e0d\u8fc7\u6211\u4eec\u4f9d\u7136\u53ef\u4ee5\u53d1\u6563\u4e00\u4e0b\uff0c\u5047\u5982Haystack\u6ca1\u4fdd\u5b58\u8fd9\u4e2a\u6620\u5c04\u5462\uff1f<\/p>\n<p>\u8fd9\u5c31\u610f\u5473\u7740\u539f\u59cbURL\u4e0d\u53ea\u5305\u542b\u56fe\u7247ID\uff0c\u8fd8\u5305\u542b\u903b\u8f91\u5377ID\u7b49\u5fc5\u8981\u4fe1\u606f\u3002\u8fd9\u6837\u4e5f\u662f\u9075\u5faamap\u7684\u884c\u4e3a\u5b9a\u4e49\u7684\uff0c\u5373\u4f7fmap\u7684\u4fe1\u606f\u6ca1\u6709\u96c6\u4e2d\u5b58\u50a8\u5728\u7cfb\u7edf\u5185\uff0c\u4f46\u662f\u5374\u5206\u6563\u5728\u5404\u4e2a\u539f\u59cbURL\u4e2d\uff0c\u4f9d\u7136\u5b58\u5728\u3002\u4e0d\u53ef\u907f\u514d\u7684\uff0c\u8fd9\u4e9b\u4fe1\u606f\u5c31\u8981\u5728upload\u9636\u6bb5\u8fd4\u56de\u7ed9\u4e1a\u52a1\u7cfb\u7edf\uff08\u6bd4\u5982Facebook\u7684\u7167\u7247\u5206\u4eab\u5e94\u7528\u7cfb\u7edf\uff09\uff0c\u4e1a\u52a1\u7cfb\u7edf\u9700\u8981\u7406\u89e3\u3001\u5b58\u50a8\u548c\u5904\u7406\u5b83\u4eec\uff08\u968f\u540e\u518d\u5229\u7528\u5b83\u4eec\u7ec4\u88c5\u4e3a\u539f\u59cbURL\u53bb\u67e5\u8be2\u56fe\u7247\uff09\u3002\u8fd9\u6837\u76f8\u5f53\u4e8e\u628amap\u7684\u7ef4\u62a4\u5de5\u4f5c\u5206\u62c5\u7ed9\u4e86\u5404\u4e2a\u7528\u6237\u7cfb\u7edf\uff0c\u8fd9\u4e5f\u662f\u8ba9\u4eba\u5341\u5206\u75db\u82e6\u7684\uff0c\u5bfc\u81f4\u4e86\u4e0d\u53ef\u63a5\u53d7\u7684\u8026\u5408\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u770bTFS\u7684\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n<p>\u201c\u2026\u2026TFS\u7684\u6587\u4ef6\u540d\u7531\u5757\u53f7\u548c\u6587\u4ef6\u53f7\u901a\u8fc7\u67d0\u79cd\u5bf9\u5e94\u5173\u7cfb\u7ec4\u6210\uff0c\u6700\u5927\u957f\u5ea6\u4e3a18\u5b57\u8282\u3002\u6587\u4ef6\u540d\u56fa\u5b9a\u4ee5T\u5f00\u59cb\uff0c\u7b2c\u4e8c\u5b57\u8282\u4e3a\u8be5\u96c6\u7fa4\u7684\u7f16\u53f7(\u53ef\u4ee5\u5728\u914d\u7f6e\u9879\u4e2d\u6307\u5b9a\uff0c\u53d6\u503c\u8303\u56f4 1~9)\u3002\u4f59\u4e0b\u7684\u5b57\u8282\u7531Block ID\u548cFile ID\u901a\u8fc7\u4e00\u5b9a\u7684\u7f16\u7801\u65b9\u5f0f\u5f97\u5230\u3002\u6587\u4ef6\u540d\u7531\u5ba2\u6237\u7aef\u7a0b\u5e8f\u8fdb\u884c\u7f16\u7801\u548c\u89e3\u7801\uff0c\u5b83\u6620\u5c04\u65b9\u5f0f\u5982\u4e0b\u56fe\u2026\u2026\u201d<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/11.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/11.jpg\" \/><img decoding=\"async\" src=\"https:\/\/kyle.ai\/blog\/wp-content\/uploads\/2013\/03\/12.jpg\" alt=\"\" data-src=\"wp-content\/uploads\/2013\/03\/12.jpg\" \/><\/p>\n<p>\u201c\u2026\u2026\u6839\u636eTFS\u6587\u4ef6\u540d\u89e3\u6790\u51faBlock ID\u548cblock\u4e2d\u7684File ID.\u2026\u2026dataserver\u4f1a\u6839\u636e\u672c\u5730\u8bb0\u5f55\u7684\u4fe1\u606f\u6765\u5f97\u5230File ID\u6240\u5728block\u7684\u504f\u79fb\u91cf\uff0c\u4ece\u800c\u8bfb\u53d6\u5230\u6b63\u786e\u7684\u6587\u4ef6\u5185\u5bb9\u2026\u2026\u201d<\/p>\n<p>\u4e00\u5207\uff0c\u8fce\u5203\u800c\u89e3\u4e86\u2026\u2026 \u8fd9\u4e2a\u65b9\u6848\u53ef\u4ee5\u79f0\u4e4b\u4e3a\u201c\u7ed3\u6784\u5316ID\u201d\u3001\u201c\u805a\u5408ID\u201d\uff0c\u6216\u8005\u662f\u201c\u547d\u540d\u89c4\u5219\u5927\u4e8e\u914d\u7f6e\u201d\u3002\u5f53\u6211\u4eec\u7ea0\u7ed3\u4e8e\u4ec5\u4ec5\u6709\u56fe\u7247ID\u4e0d\u591f\u65f6\uff0c\u53ef\u4ee5\u7ed9ID\u7b80\u5355\u7684\u52a8\u52a8\u624b\u811a\uff0c\u6bd4\u5982ID\u662flong\u7c7b\u578b\uff0c8\u4e2abyte\uff0c\u5de6\u8fb9\u7ed9\u70b9byte\u7528\u4e8e\u5b58\u50a8\u903b\u8f91\u5377ID\uff0c\u5269\u4e0b\u7684\u7528\u4e8e\u5b58\u50a8\u771f\u5b9e\u7684\u56fe\u7247ID\uff08\u67d0\u4e9b\u573a\u666f\u4e0b\u8fd8\u53ef\u4ee5\u591a\u622a\u51e0\u6bb5\u7ed9\u66f4\u591a\u7684\u5143\u6570\u636e\uff09\uff0c\u4e8e\u662f\u65e2\u907f\u514d\u4e86\u4fdd\u5b58\u5927\u91cf\u7684\u6620\u5c04\u6570\u636e\uff0c\u53c8\u907f\u514d\u4e86\u589e\u52a0\u7cfb\u7edf\u95f4\u7684\u8026\u5408\uff0c\u9c7c\u548c\u718a\u638c\u517c\u5f97\u3002\u4e0d\u8fc7\u8fd9\u4e2a\u65b9\u6848\u5bf9\u56fe\u7247ID\u6709\u6240\u7ea6\u675f\uff0c\u4e5f\u4e0d\u652f\u6301\u81ea\u5b9a\u4e49\u7684\u56fe\u7247\u540d\u79f0\uff0c\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0cTFS\u5728\u65b0\u7248\u672c\u4e2d\uff1a<\/p>\n<p>\u201c\u2026\u2026metaserver\u662f\u6211\u4eec\u57282.0\u7248\u672c\u5f15\u8fdb\u7684\u4e00\u4e2a\u670d\u52a1. \u7528\u6765\u5b58\u50a8\u4e00\u4e9b\u5143\u6570\u636e\u4fe1\u606f, \u8fd9\u6837\u539f\u672c\u4e0d\u652f\u6301\u81ea\u5b9a\u4e49\u6587\u4ef6\u540d\u7684 TFS \u5c31\u53ef\u4ee5\u5728 metaserver \u7684\u5e2e\u52a9\u4e0b, 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dataserver\u5f00\u59cb\u6570\u636e\u5199\u5165\u64cd\u4f5c\u3002master server\u5c06\u6570\u636e\u4f20\u8f93\u4e3a\u5176\u4ed6\u7684dataserver\u8282\u70b9\uff0c\u53ea\u6709\u5f53\u6240\u6709dataserver\u8282\u70b9\u5199\u5165\u5747\u6210\u529f\u65f6\uff0cmaster server\u624d\u4f1a\u5411nameserver\u548c\u5ba2\u6237\u7aef\u8fd4\u56de\u64cd\u4f5c\u6210\u529f\u7684\u4fe1\u606f\u3002\u2026\u2026\u201d<\/p>\n<p>\u53ef\u4ee5\u770b\u51fa\u5197\u4f59\u5907\u4efd+\u534f\u8c03\u8c03\u5ea6\u662f\u89e3\u51b3\u8fd9\u7c7b\u95ee\u9898\u7684\u60ef\u7528\u8303\u5f0f\uff0c\u5728\u5927\u6982\u601d\u8def\u4e0a\u4e24\u8005\u5dee\u4e0d\u591a\uff0c\u4f46\u662f\u6709\u51e0\u4e2a\u6280\u672f\u65b9\u6848\u5374\u5dee\u522b\u5f88\u5927\uff1a<\/p>\n<p>\u7b2c\u4e00\uff0c\u5197\u4f59\u5199\u673a\u5236\u3002Haystack Store\u662f\u5c06\u5197\u4f59\u5199\u7684\u8d23\u4efb\u4ea4\u7ed9\u201c\u5ba2\u6237\u7aef\u201d\uff08\u53d1\u8d77\u5199\u64cd\u4f5c\u7684\u5ba2\u6237\u7aef\uff0c\u5c31\u662f\u56fe3\u4e2d\u7684web server\uff09\uff0c\u201c\u5ba2\u6237\u7aef\u201d\u9700\u8981\u53d1\u8d77\u591a\u6b21\u5199\u64cd\u4f5c\u5230\u4e0d\u540c\u7684Store\u673a\u5668\u4e0a\uff1b\u800cTFS\u662f\u4f9d\u9760\u81ea\u8eab\u7684master-slave\u673a\u5236\uff0c\u7531master\u5411slave\u590d\u5236\u3002<\/p>\n<p>\u7b2c\u4e8c\uff0c\u673a\u623f\u5bb9\u9519\u673a\u5236\u3002TFS\u4f9d\u7136\u662f\u9075\u5faamaster-slave\u673a\u5236\uff0c\u96c6\u7fa4\u4e5f\u5206\u4e3b\u8f85\uff0c\u4e3b\u8f85\u96c6\u7fa4\u5206\u5e03\u5728\u4e0d\u540c\u673a\u623f\uff0c\u4e3b\u96c6\u7fa4\u8d1f\u8d23\u91cd\u653e\u6570\u636e\u64cd\u4f5c\u5230\u8f85\u96c6\u7fa4\u3002\u800cHaystack\u5728\u8fd9\u65b9\u9762\u6ca1\u6709\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u53ea\u662f\u7565\u5fae\u63d0\u5230\u201c\u2026\u2026Haystack\u590d\u5236\u6bcf\u5f20\u56fe\u7247\u5230\u5730\u7406\u9694\u79bb\u7684\u591a\u4e2a\u5730\u70b9\u2026\u2026\u201d<\/p>\n<p>\u9488\u5bf9\u4e0a\u9762\u4e24\u70b9\uff0c\u6309\u8bd1\u8005\u7684\u7406\u89e3\uff0cHaystack\u53ef\u80fd\u66f4\u504f\u5411\u4e8e\u5bf9\u7b49\u7ed3\u6784\u7684\u8bbe\u8ba1\uff0c\u4e5f\u5c31\u662f\u8bf4\u6ca1\u6709master\u3001slave\u4e4b\u5206\uff0c\u5404\u4e2aStore\u662f\u5bf9\u7b49\u7684\u8282\u70b9\uff0c\u6ca1\u6709\u8c01\u8d1f\u8d23\u7ed9\u8c01\u590d\u5236\u6570\u636e\uff0c\u201c\u5ba2\u6237\u7aef\u201d\u5411\u5404\u4e2aStore\u5199\u5165\u6570\u636e\uff0c\u4e00\u89c6\u540c\u4ec1\u3002<\/p>\n<p>\u4e0d\u8003\u8651webserver\u3001Directory\u7b49\u89d2\u8272\uff0c\u53ea\u8003\u8651Store\uff0c\u6765\u5206\u6790\u4e00\u4e0b\u5b83\u7684\u5bb9\u9519\u673a\u5236\uff1a\u5982\u679c\u5355\u53f0Store\u6302\u4e86\uff0cDirectory\u5728\u5e94\u7528\u5143\u6570\u636e\u7684\u76f8\u5173\u903b\u8f91\u5377\u6620\u5c04\u4e2d\u5220\u9664\u6b64\u53f0\u673a\u5668\u7684\u7269\u7406\u5377\uff08\u6b64\u8fc7\u7a0b\u7b80\u79f0\u4e3a\u201c\u8c03\u6574\u903b\u8f91\u7269\u7406\u6620\u5c04\u201d\uff09\uff0c\u5176\u4ed6\u201c\u5bf9\u7b49\u201d\u7684\u7269\u7406\u5377\u80fd\u7ee7\u7eed\u670d\u52a1\uff0c\u6ca1\u6709\u95ee\u9898\uff1b\u4e00\u6574\u4e2a\u673a\u623f\u6302\u4e86\uff0cDirectory\u5904\u7406\u8fc7\u7a0b\u548c\u5355\u53f0\u6545\u969c\u76f8\u540c\uff0c\u53ea\u662f\u4f1a\u5bf9\u6b64\u673a\u623f\u4e2d\u6bcf\u53f0\u673a\u5668\u90fd\u6267\u884c\u4e00\u904d\u201c\u8c03\u6574\u903b\u8f91\u7269\u7406\u6620\u5c04\u201d\uff0c\u7531\u4e8e\u903b\u8f91\u5377\u5230\u7269\u7406\u5377\u7684\u6620\u5c04\u662f\u5728Directory\u4e2d\u660e\u786e\u7ef4\u62a4\u7684\uff0c\u6240\u4ee5\u53ea\u8981\u5728\u7ef4\u62a4\u548c\u7ba1\u7406\u8fc7\u7a0b\u4e2d\u786e\u4fdd\u4e00\u4e2a\u903b\u8f91\u5377\u4e0b\u4e0d\u540c\u7684\u7269\u7406\u5377\u5206\u5e03\u5728\u4e0d\u540c\u7684\u673a\u623f\uff0c\u54ea\u6015\u5728\u6620\u5c04\u4e2d\u5220\u9664\u4e00\u6574\u4e2a\u673a\u623f\u6240\u6709\u673a\u5668\u5bf9\u5e94\u7684\u7269\u7406\u5377\uff0c\u5404\u4e2a\u903b\u8f91\u5377\u4e0b\u4f9d\u7136\u6301\u6709\u5230\u5176\u4ed6\u673a\u623f\u53ef\u7528\u7269\u7406\u5377\u7684\u6620\u5c04\uff0c\u4f9d\u7136\u6709\u5bf9\u7b49Store\u7684\u7269\u7406\u5377\u505a\u540e\u5907\uff0c\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n<p>\u4e3b\u4ece\u7ed3\u6784\u548c\u5bf9\u7b49\u7ed3\u6784\u5404\u6709\u6240\u957f\uff0c\u89c6\u60c5\u51b5\u9009\u62e9\u3002\u5bf9\u7b49\u7ed3\u6784\u770b\u4f3c\u7b80\u6d01\u7f8e\u597d\uff0c\u4e5f\u6709\u5f88\u591a\u7ec6\u8282\u4e0a\u7684\u59a5\u534f\uff1b\u4e3b\u4ece\u7ed3\u6784\u589e\u52a0\u4e86\u590d\u6742\u5ea6\uff0c\u6bd4\u5982\u4e25\u683c\u89d2\u8272\u5206\u914d\u3001\u7ea6\u5b9a\u89d2\u8272\u884c\u4e3a\u7b49\u7b49\uff08TFS\u7684\u8f85\u96c6\u7fa4\u4e3a\u4f55\u53ea\u8bfb\uff1f\u5728\u4e3b\u96c6\u7fa4\u6302\u6389\u65f6\u662f\u5426\u4f9d\u7136\u53ea\u8bfb\uff1f\u8fd9\u4e9b\u6bd4\u8f83\u68d8\u624b\u4e5f\u662f\u56e0\u4e3a\u6b64\u590d\u6742\u5ea6\u5427\uff09<\/p>\n<p>\u7b2c\u4e09\uff0c\u4fee\u590d\u673a\u5236\u3002Haystack\u7684\u4fee\u590d\u673a\u5236\u4f9d\u9760\u5468\u671f\u6027\u540e\u53f0\u4efb\u52a1pitchfork\u548c\u79bb\u7ebfbulk\u91cd\u7f6e\u7b49\u3002\u5728TFS\u4e2d\uff1a<\/p>\n<p>\u201c\u2026\u2026<a href=\"http:\/\/code.taobao.org\/p\/tfs\/wiki\/dataserver\/background\/\" rel=\"nofollow\" target=\"_blank\">Dataserver\u540e\u53f0\u7ebf\u7a0b\u4ecb\u7ecd<\/a>\u2026\u2026\u201d<\/p>\n<p>\u201c\u2026\u2026\u5fc3\u8df3\u7ebf\u7a0b\u2026\u2026\u8fd9\u91cc\u7684\u5fc3\u8df3\u662f\u6307Ds\u5411Ns\u53d1\u7684\u5468\u671f\u6027\u7edf\u8ba1\u4fe1\u606f\u2026\u2026\u8d1f\u8d23keepalive\u2026\u2026\u6c47\u62a5block\u7684\u5de5\u4f5c\u2026\u2026\u201d<\/p>\n<p>\u201c\u2026\u2026\u68c0\u67e5\u7ebf\u7a0b\u2026\u2026\u4fee\u590dcheck_file_queue_\u4e2d\u7684\u903b\u8f91\u5757\u2026\u2026\u6bcf\u6b21\u5bf9\u6587\u4ef6\u8fdb\u884c\u8bfb\u5199\u5220\u64cd\u4f5c\u5931\u8d25\u7684\u65f6\u5019\uff0c\u4f1atry_add_repair_task(blockid, ret)\u6765\u5c06ret\u9519\u8bef\u7684block\u52a0\u5165check_file_queue_\u4e2d\u2026\u2026\u82e5\u51fa\u9519\u5219\u4f1a\u8bf7\u6c42Ns\u8fdb\u884cupdate_block_info\u2026\u2026\u201d<\/p>\n<p>\u9664\u4e86\u7c7b\u4f3c\u7684\u8fdc\u7a0b\u5fc3\u8df3\u673a\u5236\uff0cTFS\u8fd8\u591a\u4e86\u5728DataServer\u4e0a\u5bf9\u81ea\u8eab\u7684\u9519\u8bef\u7edf\u8ba1\u548c\u81ea\u884c\u6062\u590d\uff0c\u5fc5\u8981\u65f6\u8fd8\u4f1a\u8bf7\u6c42\u4e0a\u7ea7\uff08NameServer\uff09\u5e2e\u52a9\u6062\u590d\u3002<\/p>\n<p>5 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