{"id":3269,"date":"2022-06-05T13:25:54","date_gmt":"2022-06-05T05:25:54","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3269"},"modified":"2022-06-05T13:29:53","modified_gmt":"2022-06-05T05:29:53","slug":"zab%e5%8d%8f%e8%ae%ae%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3269","title":{"rendered":"zab\u534f\u8bae\u57fa\u7840"},"content":{"rendered":"\n

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\u53c2\u8003\uff1aZookeeper\u4e4bZAB\u534f\u8bae (baidu.com)<\/a><\/p>\n\n\n\n

Zab\u534f\u8bae \u7684\u5168\u79f0\u662fZookeeper Atomic Broadcast<\/strong>\uff08Zookeeper\u539f\u5b50\u5e7f\u64ad\uff09\u3002<\/p>\n\n\n\n

Zab \u534f\u8bae\u7684\u7279\u6027<\/strong>\uff1a<\/p>\n\n\n\n

1\uff09Zab \u534f\u8bae\u9700\u8981\u786e\u4fdd\u90a3\u4e9b\u5df2\u7ecf\u5728 Leader \u670d\u52a1\u5668\u4e0a\u63d0\u4ea4\uff08Commit\uff09\u7684\u4e8b\u52a1\u6700\u7ec8\u88ab\u6240\u6709\u7684\u670d\u52a1\u5668\u63d0\u4ea4<\/strong>\u3002<\/p>\n\n\n\n

2\uff09Zab \u534f\u8bae\u9700\u8981\u786e\u4fdd\u4e22\u5f03\u90a3\u4e9b\u53ea\u5728 Leader \u4e0a\u88ab\u63d0\u51fa\u800c\u6ca1\u6709\u88ab\u63d0\u4ea4\u7684\u4e8b\u52a1<\/strong>\u3002<\/p>\n\n\n\n

Zab\u534f\u8bae\u6838\u5fc3<\/h3>\n\n\n\n

Zab\u534f\u8bae\u7684\u6838\u5fc3\uff1a\u5b9a\u4e49\u4e86\u4e8b\u52a1\u8bf7\u6c42\u7684\u5904\u7406\u65b9\u5f0f<\/strong><\/p>\n\n\n\n

1\uff09\u6240\u6709\u7684\u4e8b\u52a1\u8bf7\u6c42\u5fc5\u987b\u7531\u4e00\u4e2a\u5168\u5c40\u552f\u4e00\u7684\u670d\u52a1\u5668\u6765\u534f\u8c03\u5904\u7406\uff0c\u8fd9\u6837\u7684\u670d\u52a1\u5668\u88ab\u53eb\u505aLeader\u670d\u52a1\u5668<\/strong>\u3002\u5176\u4ed6\u5269\u4f59\u7684\u670d\u52a1\u5668\u5219\u662fFollower\u670d\u52a1\u5668<\/strong>\u3002<\/p>\n\n\n\n

2\uff09Leader\u670d\u52a1\u5668 \u8d1f\u8d23\u5c06\u4e00\u4e2a\u5ba2\u6237\u7aef\u4e8b\u52a1\u8bf7\u6c42\uff0c\u8f6c\u6362\u6210\u4e00\u4e2a\u4e8b\u52a1Proposal<\/strong>\uff0c\u5e76\u5c06\u8be5 Proposal \u5206\u53d1\u7ed9\u96c6\u7fa4\u4e2d\u6240\u6709\u7684 Follower \u670d\u52a1\u5668\uff0c\u4e5f\u5c31\u662f\u5411\u6240\u6709 Follower \u8282\u70b9\u53d1\u9001\u6570\u636e\u5e7f\u64ad\u8bf7\u6c42\uff08\u6216\u6570\u636e\u590d\u5236\uff09<\/p>\n\n\n\n

3\uff09\u5206\u53d1\u4e4b\u540eLeader\u670d\u52a1\u5668\u9700\u8981\u7b49\u5f85\u6240\u6709Follower\u670d\u52a1\u5668\u7684\u53cd\u9988\uff08Ack\u8bf7\u6c42\uff09\uff0c\u5728Zab\u534f\u8bae\u4e2d\uff0c\u53ea\u8981\u8d85\u8fc7\u534a\u6570\u7684Follower\u670d\u52a1\u5668\u8fdb\u884c\u4e86\u6b63\u786e\u7684\u53cd\u9988<\/strong>\u540e\uff08\u4e5f\u5c31\u662f\u6536\u5230\u534a\u6570\u4ee5\u4e0a\u7684Follower\u7684Ack\u8bf7\u6c42\uff09\uff0c\u90a3\u4e48 Leader \u5c31\u4f1a\u518d\u6b21\u5411\u6240\u6709\u7684 Follower\u670d\u52a1\u5668\u53d1\u9001 Commit \u6d88\u606f\uff0c\u8981\u6c42\u5176\u5c06\u4e0a\u4e00\u4e2a \u4e8b\u52a1proposal \u8fdb\u884c\u63d0\u4ea4\u3002<\/p>\n\n\n\n

<\/p>\n\n\n\n

Zab \u534f\u8bae\u5305\u62ec\u4e24\u79cd\u57fa\u672c\u7684\u6a21\u5f0f\uff1a\u5d29\u6e83\u6062\u590d\u548c\u6d88\u606f\u5e7f\u64ad<\/strong><\/p>\n\n\n\n

\u534f\u8bae\u8fc7\u7a0b<\/p>\n\n\n\n

\u5f53\u6574\u4e2a\u96c6\u7fa4\u542f\u52a8\u8fc7\u7a0b\u4e2d\uff0c\u6216\u8005\u5f53 Leader \u670d\u52a1\u5668\u51fa\u73b0\u7f51\u7edc\u4e2d\u5f04\u65ad\u3001\u5d29\u6e83\u9000\u51fa\u6216\u91cd\u542f\u7b49\u5f02\u5e38\u65f6\uff0cZab\u534f\u8bae\u5c31\u4f1a\u8fdb\u5165\u5d29\u6e83\u6062\u590d\u6a21\u5f0f<\/strong>\uff0c\u9009\u4e3e\u4ea7\u751f\u65b0\u7684Leader\u3002<\/p>\n\n\n\n

\u5f53\u9009\u4e3e\u4ea7\u751f\u4e86\u65b0\u7684 Leader\uff0c\u540c\u65f6\u96c6\u7fa4\u4e2d\u6709\u8fc7\u534a\u7684\u673a\u5668\u4e0e\u8be5 Leader \u670d\u52a1\u5668\u5b8c\u6210\u4e86\u72b6\u6001\u540c\u6b65\uff08\u5373\u6570\u636e\u540c\u6b65\uff09\u4e4b\u540e\uff0cZab\u534f\u8bae\u5c31\u4f1a\u9000\u51fa\u5d29\u6e83\u6062\u590d\u6a21\u5f0f\uff0c\u8fdb\u5165\u6d88\u606f\u5e7f\u64ad\u6a21\u5f0f<\/strong>\u3002<\/p>\n\n\n\n

<\/p>\n\n\n\n

Zab\u534f\u8bae\u4e09\u4e2a\u9636\u6bb5\uff1a<\/p>\n\n\n\n

1\uff09\u9009\u4e3e\uff08Fast Leader Election\uff09<\/strong><\/p>\n\n\n\n

2\uff09\u6062\u590d\uff08Recovery Phase\uff09<\/strong><\/p>\n\n\n\n

3\uff09\u5e7f\u64ad\uff08Broadcast Phase\uff09<\/strong><\/p>\n\n\n\n

Fast Leader Election\uff08\u5feb\u901f\u9009\u4e3e\uff09<\/strong><\/p>\n\n\n\n

\u524d\u9762\u63d0\u5230\u7684 FLE \u4f1a\u9009\u4e3e\u62e5\u6709\u6700\u65b0Proposal history \uff08lastZxid\u6700\u5927\uff09\u7684\u8282\u70b9\u4f5c\u4e3a Leader\uff0c\u8fd9\u6837\u5c31\u7701\u53bb\u4e86\u53d1\u73b0\u6700\u65b0\u63d0\u8bae\u7684\u6b65\u9aa4\u3002\u8fd9\u662f\u57fa\u4e8e\u62e5\u6709\u6700\u65b0\u63d0\u8bae\u7684\u8282\u70b9\u4e5f\u62e5\u6709\u6700\u65b0\u7684\u63d0\u4ea4\u8bb0\u5f55<\/strong><\/p>\n\n\n\n

  1. \u6210\u4e3a Leader \u7684\u6761\u4ef6\uff1a<\/strong><\/li>
  2. 1\uff09\u9009 epoch \u6700\u5927\u7684<\/li>
  3. 2\uff09\u82e5 epoch \u76f8\u7b49\uff0c\u9009 zxid \u6700\u5927\u7684<\/li>
  4. 3\uff09\u82e5 epoch \u548c zxid \u76f8\u7b49\uff0c\u9009\u62e9 server_id \u6700\u5927\u7684\uff08zoo.cfg\u4e2d\u7684myid\uff09<\/li><\/ol>\n\n\n\n

    Zab \u534f\u8bae\u901a\u8fc7 epoch \u7f16\u53f7\u6765\u533a\u5206 Leader \u53d8\u5316\u5468\u671f<\/strong>\uff0c\u80fd\u591f\u6709\u6548\u907f\u514d\u4e0d\u540c\u7684 Leader \u9519\u8bef\u7684\u4f7f\u7528\u4e86\u76f8\u540c\u7684 zxid \u7f16\u53f7\u63d0\u51fa\u4e86\u4e0d\u4e00\u6837\u7684 Proposal \u7684\u5f02\u5e38\u60c5\u51b5\u3002<\/p>\n\n\n\n

    \u6574\u4e2a\u4e8b\u52a1\u7684\u8fc7\u7a0b<\/p>\n\n\n\n

    \u5982\u679c\u96c6\u7fa4\u4e2d\u7684 Learner \u8282\u70b9\u6536\u5230\u5ba2\u6237\u7aef\u7684\u4e8b\u52a1\u8bf7\u6c42\uff0c\u90a3\u4e48\u8fd9\u4e9b Learner \u4f1a\u5c06\u8bf7\u6c42\u8f6c\u53d1\u7ed9 Leader \u670d\u52a1\u5668\u3002\u7136\u540e\u518d\u6267\u884c\u5982\u4e0b\u7684\u5177\u4f53\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n

    1. Leader \u63a5\u6536\u5230\u4e8b\u52a1\u8bf7\u6c42\u540e\uff0c\u4e3a\u4e8b\u52a1\u8d4b\u4e88\u4e00\u4e2a\u5168\u5c40\u552f\u4e00\u7684 64 \u4f4d\u81ea\u589e id\uff0c\u5373 zxid\uff0c\u901a\u8fc7 zxid \u7684\u5927\u5c0f\u6bd4\u8f83\u5373\u53ef\u5b9e\u73b0\u4e8b\u52a1\u7684\u6709\u5e8f\u6027\u7ba1\u7406\uff0c\u7136\u540e\u5c06\u4e8b\u52a1\u5c01\u88c5\u4e3a\u4e00\u4e2a Proposal\u3002<\/li>
    2. Leader \u6839\u636e Follower \u5217\u8868\u83b7\u53d6\u5230\u6240\u6709 Follower\uff0c\u7136\u540e\u518d\u5c06 Proposal \u901a\u8fc7\u8fd9\u4e9b Follower \u7684 \u961f\u5217\u5c06\u63d0\u6848\u53d1\u9001\u7ed9\u5404\u4e2a Follower\u3002<\/li>
    3. \u5f53 Follower \u63a5\u6536\u5230\u63d0\u6848\u540e\uff0c\u4f1a\u5148\u5c06\u63d0\u6848\u7684 zxid \u4e0e\u672c\u5730\u8bb0\u5f55\u7684\u4e8b\u52a1\u65e5\u5fd7\u4e2d\u7684\u6700\u5927\u7684 zxid \u8fdb\u884c\u6bd4\u8f83\u3002\u82e5\u5f53\u524d\u63d0\u6848\u7684 zxid \u5927\u4e8e\u6700\u5927 zxid\uff0c\u5219\u5c06\u5f53\u524d\u63d0\u6848\u8bb0\u5f55\u5230\u672c\u5730\u4e8b\u52a1\u65e5\u5fd7\u4e2d\uff0c\u5e76 \u5411 Leader \u8fd4\u56de\u4e00\u4e2a ACK\u3002<\/li>
    4. \u5f53 Leader \u63a5\u6536\u5230\u8fc7\u534a\u7684 ACKs \u540e\uff0cLeader \u5c31\u4f1a\u5411\u6240\u6709 Follower \u7684\u961f\u5217\u53d1\u9001 COMMIT \u6d88\u606f\uff0c\u5411\u6240\u6709 Observer \u7684\u961f\u5217\u53d1\u9001 Proposal\u3002<\/li>
    5. \u5f53 Follower \u6536\u5230 COMMIT \u6d88\u606f\u540e\uff0c\u5c31\u4f1a\u5c06\u65e5\u5fd7\u4e2d\u7684\u4e8b\u52a1\u6b63\u5f0f\u66f4\u65b0\u5230\u672c\u5730\u3002\u5f53 Observer \u6536\u5230 Proposal \u540e\uff0c\u4f1a\u76f4\u63a5\u5c06\u4e8b\u52a1\u66f4\u65b0\u5230\u672c\u5730\u3002<\/li>
    6. \u65e0\u8bba\u662f Follower \u8fd8\u662f Observer\uff0c\u5728\u540c\u6b65\u5b8c\u6210\u540e\u90fd\u9700\u8981\u5411 Leader \u53d1\u9001\u6210\u529f ACK\u3002<\/li><\/ol>\n\n\n\n

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