{"id":539,"date":"2016-09-20T09:57:13","date_gmt":"2016-09-20T09:57:13","guid":{"rendered":"5737034557ef5b8c02c0e46513b98f90"},"modified":"2016-09-20T09:57:13","modified_gmt":"2016-09-20T09:57:13","slug":"","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/539","title":{"rendered":"Zookeeper\u7684\u6838\u5fc3\uff1aZAB\u539f\u5b50\u6d88\u606f\u5e7f\u64ad\u534f\u8bae"},"content":{"rendered":"

\u3000\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a>
\n        ZooKeeper\u4e3a\u9ad8\u53ef\u7528\u7684\u4e00\u81f4\u6027\u534f\u8c03\u6846\u67b6\uff0c\u81ea\u7136\u7684ZooKeeper\u4e5f\u6709\u7740\u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5b9e\u73b0\uff0cZooKeeper\u4f7f\u7528\u7684\u662fZAB\u534f\u8bae\u4f5c\u4e3a\u6570\u636e\u4e00\u81f4\u6027\u7684\u7b97\u6cd5\uff0c<\/span>ZAB\uff08ZooKeeper Atomic Broadcast \uff09<\/span><\/strong>\u5168
\n\u79f0\u4e3a\uff1a\u539f\u5b50\u6d88\u606f\u5e7f\u64ad\u534f\u8bae\uff1bZAB\u53ef\u4ee5\u8bf4\u662f\u5728Paxos\u7b97\u6cd5\u57fa\u7840\u4e0a\u8fdb\u884c\u4e86\u6269\u5c55\u6539\u9020\u800c\u6765\u7684\uff0cZAB\u534f\u8bae\u8bbe\u8ba1\u4e86\u652f\u6301\u5d29\u6e83\u6062\u590d\uff0cZooKeeper\u4f7f\u7528\u5355\u4e00\u4e3b\u8fdb\u7a0b
\nLeader\u7528\u4e8e\u5904\u7406\u5ba2\u6237\u7aef\u6240\u6709\u4e8b\u52a1\u8bf7\u6c42\uff0c\u91c7\u7528ZAB\u534f\u8bae\u5c06\u670d\u52a1\u5668\u6570\u72b6\u6001\u4ee5\u4e8b\u52a1\u5f62\u5f0f\u5e7f\u64ad\u5230\u6240\u6709Follower\u4e0a\uff1b\u7531\u4e8e\u4e8b\u52a1\u95f4\u53ef\u80fd\u5b58\u5728\u7740\u4f9d\u8d56\u5173\u7cfb\uff0cZAB
\n\u534f\u8bae\u4fdd\u8bc1Leader\u5e7f\u64ad\u7684\u53d8\u66f4\u5e8f\u5217\u88ab\u987a\u5e8f\u7684\u5904\u7406\uff0c\uff1a\u4e00\u4e2a\u72b6\u6001\u88ab\u5904\u7406\u90a3\u4e48\u5b83\u6240\u4f9d\u8d56\u7684\u72b6\u6001\u4e5f\u5df2\u7ecf\u63d0\u524d\u88ab\u5904\u7406\uff1bZAB\u534f\u8bae\u652f\u6301\u7684\u5d29\u6e83\u6062\u590d\u53ef\u4ee5\u4fdd\u8bc1\u5728
\nLeader\u8fdb\u7a0b\u5d29\u6e83\u7684\u65f6\u5019\u53ef\u4ee5\u91cd\u65b0\u9009\u51faLeader\u5e76\u4e14\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\uff1b<\/span>
\n\u3000\u3000\u5728ZooKeeper\u4e2d
\n\u6240\u6709\u7684\u4e8b\u52a1\u8bf7\u6c42\u90fd\u7531\u4e00\u4e2a\u4e3b\u670d\u52a1\u5668\u4e5f\u5c31\u662fLeader\u6765\u5904\u7406\uff0c\u5176\u4ed6\u670d\u52a1\u5668\u4e3aFollower\uff0cLeader\u5c06\u5ba2\u6237\u7aef\u7684\u4e8b\u52a1\u8bf7\u6c42\u8f6c\u6362\u4e3a\u4e8b\u52a1Proposal\uff0c
\n\u5e76\u4e14\u5c06Proposal\u5206\u53d1\u7ed9\u96c6\u7fa4\u4e2d\u5176\u4ed6\u6240\u6709\u7684Follower\uff0c\u7136\u540eLeader\u7b49\u5f85Follwer\u53cd\u9988\uff0c\u5f53\u6709<\/span>\u8fc7\u534a\u6570\uff08>=N\/2+1\uff09<\/span><\/strong>\u7684Follower\u53cd\u9988\u4fe1\u606f\u540e\uff0cLeader\u5c06\u518d\u6b21\u5411\u96c6\u7fa4\u5185Follower\u5e7f\u64adCommit\u4fe1\u606f\uff0cCommit\u4e3a\u5c06\u4e4b\u524d\u7684Proposal\u63d0\u4ea4\uff1b<\/span> <\/p>\n

\n\t\u4e00\u3001\u534f\u8bae\u72b6\u6001<\/span> <\/h2>\n

\n\t\u3000\u3000ZAB\u534f\u8bae\u4e2d\u5b58\u5728\u7740\u4e09\u79cd\u72b6\u6001\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u5c5e\u4e8e\u4ee5\u4e0b\u4e09\u79cd\u4e2d\u7684\u4e00\u79cd\uff1a<\/span>
\n\u3000\u30001. <\/span>Looking\uff08\u53d1\u73b0\uff09<\/span><\/strong>\uff1a\u7cfb\u7edf\u521a\u542f\u52a8\u65f6\u6216\u8005Leader\u5d29\u6e83\u540e\u6b63\u5904\u4e8e\u9009\u4e3e\u72b6\u6001<\/span>
\n\u3000\u30002. <\/span>Following\uff08\u540c\u6b65\uff09<\/span><\/strong>\uff1aFollower\u8282\u70b9\u6240\u5904\u7684\u72b6\u6001\uff0cFollower\u4e0eLeader\u5904\u4e8e\u6570\u636e\u540c\u6b65\u9636\u6bb5\uff1b<\/span>
\n\u3000\u30003. <\/span>Leading\uff08\u9886\u5bfc\uff09<\/span><\/strong>\uff1aLeader\u6240\u5904\u72b6\u6001\uff0c\u5f53\u524d\u96c6\u7fa4\u4e2d\u6709\u4e00\u4e2aLeader\u4e3a\u4e3b\u8fdb\u7a0b\uff1b<\/span> <\/p>\n

\n\t\u3000\u3000ZooKeeper\u542f
\n\u52a8\u65f6\u6240\u6709\u8282\u70b9\u521d\u59cb\u72b6\u6001\u4e3aLooking\uff0c\u8fd9\u65f6\u96c6\u7fa4\u4f1a\u5c1d\u8bd5\u9009\u4e3e\u51fa\u4e00\u4e2aLeader\u8282\u70b9\uff0c\u9009\u4e3e\u51fa\u7684Leader\u8282\u70b9\u5207\u6362\u4e3aLeading\u72b6\u6001\uff1b\u5f53\u8282\u70b9\u53d1\u73b0\u96c6\u7fa4
\n\u4e2d\u5df2\u7ecf\u9009\u4e3e\u51faLeader\u5219\u8be5\u8282\u70b9\u4f1a\u5207\u6362\u5230Following\u72b6\u6001\uff0c\u7136\u540e\u548cLeader\u8282\u70b9\u4fdd\u6301\u540c\u6b65\uff1b\u5f53Follower\u8282\u70b9\u4e0eLeader\u5931\u53bb\u8054\u7cfb\u65f6
\nFollower\u8282\u70b9\u5219\u4f1a\u5207\u6362\u5230Looking\u72b6\u6001\uff0c\u5f00\u59cb\u65b0\u4e00\u8f6e\u9009\u4e3e\uff1b\u5728ZooKeeper\u7684\u6574\u4e2a\u751f\u547d\u5468\u671f\u4e2d\u6bcf\u4e2a\u8282\u70b9\u90fd\u4f1a\u5728Looking\u3001
\nFollowing\u3001Leading\u72b6\u6001\u95f4\u4e0d\u65ad\u8f6c\u6362\uff1b<\/span> <\/p>\n

\n\t\u3000\u3000\u3000\u3000<\/span>\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a> <\/p>\n

\n\t\u3000\u3000\u9009\u4e3e\u51faLeader\u8282
\n\u70b9\u540eZAB\u8fdb\u5165\u539f\u5b50\u5e7f\u64ad\u9636\u6bb5\uff0c\u8fd9\u65f6Leader\u4e3a\u548c\u81ea\u5df1\u540c\u6b65\u7684\u6bcf\u4e2a\u8282\u70b9Follower\u521b\u5efa\u4e00\u4e2a\u64cd\u4f5c\u5e8f\u5217\uff0c\u4e00\u4e2a\u65f6\u671f\u4e00\u4e2aFollower\u53ea\u80fd\u548c\u4e00\u4e2a
\nLeader\u4fdd\u6301\u540c\u6b65\uff0cLeader\u8282\u70b9\u4e0eFollower\u8282\u70b9\u4f7f\u7528\u5fc3\u8df3\u68c0\u6d4b\u6765\u611f\u77e5\u5bf9\u65b9\u7684\u5b58\u5728\uff1b\u5f53Leader\u8282\u70b9\u5728\u8d85\u65f6\u65f6\u95f4\u5185\u6536\u5230\u6765\u81eaFollower
\n\u7684\u5fc3\u8df3\u68c0\u6d4b\u90a3Follower\u8282\u70b9\u4f1a\u4e00\u76f4\u4e0e\u8be5\u8282\u70b9\u4fdd\u6301\u8fde\u63a5\uff1b\u82e5\u8d85\u65f6\u65f6\u95f4\u5185Leader\u6ca1\u6709\u63a5\u6536\u5230\u6765\u81ea\u8fc7\u534aFollower\u8282\u70b9\u7684\u5fc3\u8df3\u68c0\u6d4b\u6216TCP\u8fde\u63a5\u65ad
\n\u5f00\uff0c\u90a3Leader\u4f1a\u7ed3\u675f\u5f53\u524d\u5468\u671f\u7684\u9886\u5bfc\uff0c\u5207\u6362\u5230Looking\u72b6\u6001\uff0c\u6240\u6709Follower\u8282\u70b9\u4e5f\u4f1a\u653e\u5f03\u8be5Leader\u8282\u70b9\u5207\u6362\u5230Looking\u72b6\u6001\uff0c\u7136
\n\u540e\u5f00\u59cb\u65b0\u4e00\u8f6e\u9009\u4e3e\uff1b<\/span> <\/p>\n

\n\t\u4e8c\u3001\u7b97\u6cd5\u9636\u6bb5<\/span> <\/h2>\n

\n\t\u3000\u3000ZAB\u534f\u8bae\u5b9a\u4e49\u4e86<\/span>\u9009\u4e3e\uff08election\uff09\u3001\u53d1\u73b0\uff08discovery\uff09\u3001\u540c\u6b65\uff08sync\uff09\u3001\u5e7f\u64ad(Broadcast)<\/span><\/strong>\u56db
\n\u4e2a\u9636\u6bb5\uff1bZAB\u9009\u4e3e\uff08election\uff09\u65f6\u5f53Follower\u5b58\u5728ZXID\uff08\u4e8b\u52a1ID\uff09\u65f6\u5224\u65ad\u6240\u6709Follower\u8282\u70b9\u7684\u4e8b\u52a1\u65e5\u5fd7\uff0c\u53ea\u6709lastZXID
\n\u7684\u8282\u70b9\u624d\u6709\u8d44\u683c\u6210\u4e3aLeader\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u9009\u4e3e\u51fa\u6765\u7684Leader\u603b\u6709\u6700\u65b0\u7684\u4e8b\u52a1\u65e5\u5fd7\uff0c\u57fa\u4e8e\u8fd9\u4e2a\u539f\u56e0\u6240\u4ee5ZooKeeper\u5b9e\u73b0\u7684\u65f6\u5019\u628a<\/span>\u53d1\u73b0\uff08discovery\uff09\u4e0e\u540c\u6b65\uff08sync\uff09\u5408\u5e76\u4e3a\u6062\u590d\uff08recovery\uff09<\/span><\/strong>\u9636\u6bb5\uff1b<\/span>
\n\u3000\u30001. <\/span>Election<\/span><\/strong>\uff1a\u5728Looking\u72b6\u6001\u4e2d\u9009\u4e3e\u51faLeader\u8282\u70b9\uff0cLeader\u7684lastZXID\u603b\u662f\u6700\u65b0\u7684\uff1b<\/span>
\n\u3000\u30002. <\/span>Discovery<\/span><\/strong>\uff1aFollower\u8282\u70b9\u5411\u51c6Leader\u63a8\u9001FOllOWERINFO\uff0c\u8be5\u4fe1\u606f\u4e2d\u5305\u542b\u4e86\u4e0a\u4e00\u5468\u671f\u7684epoch\uff0c\u63a5\u53d7\u51c6Leader\u7684NEWLEADER\u6307\u4ee4\uff0c\u68c0\u67e5newEpoch\u6709\u6548\u6027\uff0c\u51c6Leader\u8981\u786e\u4fddFollower\u7684epoch\u4e0eZXID\u5c0f\u4e8e\u6216\u7b49\u4e8e\u81ea\u8eab\u7684\uff1b<\/span>
\n\u3000\u30003. <\/span>sync<\/span><\/strong>\uff1a\u5c06Follower\u4e0eLeader\u7684\u6570\u636e\u8fdb\u884c\u540c\u6b65\uff0c\u7531Leader\u53d1\u8d77\u540c\u6b65\u6307\u4ee4\uff0c\u6700\u603b\u4fdd\u6301\u96c6\u7fa4\u6570\u636e\u7684\u4e00\u81f4\u6027\uff1b<\/span>
\n\u3000\u30004. <\/span>Broadcast<\/span><\/strong>\uff1aLeader\u5e7f\u64adProposal\u4e0eCommit\uff0cFollower\u63a5\u53d7Proposal\u4e0eCommit\uff1b<\/span>
\n\u3000\u30005. <\/span>Recovery<\/span><\/strong>\uff1a\u5728Election\u9636\u6bb5\u9009\u4e3e\u51faLeader\u540e\u672c\u9636\u6bb5\u4e3b\u8981\u5de5\u4f5c\u5c31\u662f\u8fdb\u884c\u6570\u636e\u7684\u540c\u6b65\uff0c\u4f7fLeader\u5177\u6709highestZXID\uff0c\u96c6\u7fa4\u4fdd\u6301\u6570\u636e\u7684\u4e00\u81f4\u6027\uff1b<\/span> <\/p>\n

\n\t\u3000\u30001\u3001<\/span>\u9009\u4e3e\uff08Election\uff09<\/span><\/strong>
\n\u3000\u3000election\u9636\u6bb5\u5fc5
\n\u987b\u786e\u4fdd\u9009\u51fa\u7684Leader\u5177\u6709highestZXID\uff0c\u5426\u5219\u5728Recovery\u9636\u6bb5\u6ca1\u6cd5\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0cRecovery\u9636\u6bb5Leader\u8981\u6c42
\nFollower\u5411\u81ea\u5df1\u540c\u6b65\u6570\u636e\u6ca1\u6709Follower\u8981\u6c42Leader\u4fdd\u6301\u6570\u636e\u540c\u6b65\uff0c\u6240\u6709\u9009\u4e3e\u51fa\u6765\u7684Leader\u8981\u5177\u6709\u6700\u65b0\u7684ZXID\uff1b<\/span>
\n\u3000\u3000\u5728\u9009\u4e3e\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u5bf9\u6bcf\u4e2aFollower\u8282\u70b9\u7684ZXID\u8fdb\u884c\u5bf9\u6bd4\u53ea\u6709highestZXID\u7684Follower\u624d\u53ef\u80fd\u5f53\u9009Leader\uff1b<\/span>
\n\u9009\u4e3e\u6d41\u7a0b\uff1a<\/span>
\n\u3000\u30001. \u6bcf\u4e2aFollower\u90fd\u5411\u5176\u4ed6\u8282\u70b9\u53d1\u9001\u9009\u81ea\u8eab\u4e3aLeader\u7684Vote\u6295\u7968\u8bf7\u6c42\uff0c\u7b49\u5f85\u56de\u590d\uff1b<\/span>
\n\u3000\u30002. Follower\u63a5\u53d7\u5230\u7684Vote\u5982\u679c\u6bd4\u81ea\u8eab\u7684\u5927\uff08ZXID\u66f4\u65b0\uff09\u65f6\u5219\u6295\u7968\uff0c\u5e76\u66f4\u65b0\u81ea\u8eab\u7684Vote\uff0c\u5426\u5219\u62d2\u7edd\u6295\u7968\uff1b<\/span>
\n\u3000\u30003. \u6bcf\u4e2aFollower\u4e2d\u7ef4\u62a4\u7740\u4e00\u4e2a\u6295\u7968\u8bb0\u5f55\u8868\uff0c\u5f53\u67d0\u4e2a\u8282\u70b9\u6536\u5230\u8fc7\u534a\u7684\u6295\u7968\u65f6\uff0c\u7ed3\u675f\u6295\u7968\u5e76\u628a\u8be5Follower\u9009\u4e3aLeader\uff0c\u6295\u7968\u7ed3\u675f\uff1b<\/span> <\/p>\n

\n\t\u3000\u3000<\/span>ZAB\u534f\u8bae\u4e2d\u4f7f\u7528ZXID\u4f5c\u4e3a\u4e8b\u52a1\u7f16\u53f7\uff0cZXID\u4e3a64\u4f4d\u6570\u5b57<\/span><\/strong>\uff0c
\n\u4f4e32\u4f4d\u4e3a\u4e00\u4e2a\u9012\u589e\u7684\u8ba1\u6570\u5668\uff0c\u6bcf\u4e00\u4e2a\u5ba2\u6237\u7aef\u7684\u4e00\u4e2a\u4e8b\u52a1\u8bf7\u6c42\u65f6Leader\u4ea7\u751f\u65b0\u7684\u4e8b\u52a1\u540e\u8be5\u8ba1\u6570\u5668\u90fd\u4f1a\u52a01\uff0c\u9ad832\u4f4d\u4e3aLeader\u5468\u671fepoch\u7f16\u53f7\uff0c\u5f53
\n\u65b0\u9009\u4e3e\u51fa\u4e00\u4e2aLeader\u8282\u70b9\u65f6Leader\u4f1a\u53d6\u51fa\u672c\u5730\u65e5\u5fd7\u4e2d\u6700\u5927\u4e8b\u52a1Proposal\u7684ZXID\u89e3\u6790\u51fa\u5bf9\u5e94\u7684epoch\u628a\u8be5\u503c\u52a01\u4f5c\u4e3a\u65b0\u7684epoch\uff0c
\n\u5c06\u4f4e32\u4f4d\u4ece0\u5f00\u59cb\u751f\u6210\u65b0\u7684ZXID\uff1bZAB\u4f7f\u7528epoch\u6765\u533a\u5206\u4e0d\u540c\u7684Leader\u5468\u671f\uff1b<\/span> <\/p>\n

\n\t\u3000\u30002\u3001<\/span>\u6062\u590d\uff08Recovery\uff09<\/span><\/strong>
\n\u3000\u3000\u5728election\u9636\u6bb5\u9009\u4e3e\u51fa\u6765\u7684Leader\u5df2\u7ecf\u5177\u6709\u6700\u65b0\u7684ZXID\uff0c\u6240\u6709\u672c\u9636\u6bb5\u7684\u4e3b\u8981\u5de5\u4f5c\u662f\u6839\u636eLeader\u7684\u4e8b\u52a1\u65e5\u5fd7\u5bf9Follower\u8282\u70b9\u6570\u636e\u8fdb\u884c\u66f4\u65b0\uff1b<\/span>
\n\u3000\u3000
\nLeader\uff1aLeader\u751f\u6210\u65b0\u7684ZXID\u4e0eepoch\uff0c\u63a5\u6536Follower\u53d1\u9001\u8fc7\u6765\u7684FOllOWERINFO\uff08\u542b\u6709\u5f53\u524d\u8282\u70b9\u7684LastZXID\uff09
\n\u7136\u540e\u5f80Follower\u53d1\u9001NEWLEADER\uff1bLeader\u6839\u636eFollower\u53d1\u9001\u8fc7\u6765\u7684LastZXID\u6839\u636e\u6570\u636e\u66f4\u65b0\u7b56\u7565\u5411Follower\u53d1\u9001\u66f4
\n\u65b0\u6307\u4ee4\uff1b<\/span>
\n\u3000\u3000\u540c\u6b65\u7b56\u7565\uff1a<\/span>
\n\u3000\u30001. <\/span>SNAP<\/span><\/strong>\uff1a\u5982\u679cFollower\u6570\u636e\u592a\u8001\uff0cLeader\u5c06\u53d1\u9001\u5feb\u7167SNAP\u6307\u4ee4\u7ed9Follower\u540c\u6b65\u6570\u636e\uff1b<\/span>
\n\u3000\u30002. <\/span>DIFF<\/span><\/strong>\uff1aLeader\u53d1\u9001\u4eceFollolwer.lastZXID\u5230Leader.lastZXID\u8bae\u6848\u7684DIFF\u6307\u4ee4\u7ed9Follower\u540c\u6b65\u6570\u636e\uff1b<\/span>
\n\u3000\u30003. <\/span>TRUNC<\/span><\/strong>\uff1a\u5f53Follower.lastZXID\u6bd4Leader.lastZXID\u5927\u65f6\uff0cLeader\u53d1\u9001\u4eceLeader.lastZXID\u5230Follower.lastZXID\u7684TRUNC\u6307\u4ee4\u8ba9Follower\u4e22\u5f03\u8be5\u6bb5\u6570\u636e\uff1b<\/span>
\n\u3000\u3000Follower\uff1a\u5f80
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\nepoch\u6bd4\u5f53\u524dFollower\u7684epoch\u5c0f\u90a3\u4e48Follower\u8f6c\u5230Election\u9636\u6bb5\uff1bFollower\u8fd8\u6709\u4e3b\u8981\u5de5\u4f5c\u662f\u63a5\u6536SNAP\/DIFF
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\n\u4f1a\u628a\u8be5\u8282\u70b9\u6dfb\u52a0\u5230\u53ef\u7528Follower\u5217\u8868\u4e2d\uff1b<\/span>
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\n\t\u3000\u30003\u3001<\/span>\u5e7f\u64ad(Broadcast)<\/span><\/strong>
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\n\u7406\uff1b<\/span><\/p>\n

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\n\u63d0\u4ea4\uff1b<\/span><\/p>\n

\n<\/p>\n

\u6458\u81ea\uff1a http:\/\/blog.itpub.net\/30316686\/viewspace-2106956\/
\n<\/span> <\/p>\n","protected":false},"excerpt":{"rendered":"

\u3000\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a>
\n        ZooKeeper\u4e3a\u9ad8\u53ef\u7528\u7684\u4e00\u81f4\u6027\u534f\u8c03\u6846\u67b6\uff0c\u81ea\u7136\u7684ZooKeeper\u4e5f\u6709\u7740\u4e00\u81f4\u6027\u7b97\u6cd5\u7684\u5b9e\u73b0\uff0cZooKeeper\u4f7f\u7528\u7684\u662fZAB\u534f\u8bae\u4f5c\u4e3a\u6570\u636e\u4e00\u81f4\u6027\u7684\u7b97\u6cd5\uff0c<\/span>ZAB\uff08ZooKeeper Atomic Broadcast \uff09<\/span><\/strong>\u5168
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\u3000\u3000\u5728ZooKeeper\u4e2d
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