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ZooKeeper 无法启动，因为 acceptingEpoch 小于 currentEpoch

tag-icon • tag-icon kafka zookeeper
ZooKeeper 无法启动，因为 acceptingEpoch 小于 currentEpoch

我有 zookeeper.version=3.4.10，并且我看到：

https://issues.apache.org/jira/browse/ZOOKEEPER-2307

但处于未解决状态。问题是由于磁盘空间已满而出现的。现在我删除了一些日志并释放了空间，我想启动 zookeeper，但由于此错误，它无法启动：

[2019-01-22 09:07:32,646] ERROR Unable to load database on disk 
(org.apache.zookeeper.server.quorum.QuorumPeer)
java.io.IOException: The accepted epoch, 13 is less than the current epoch, 
14
    at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)
    at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:591)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:164)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
[2019-01-22 09:07:32,648] ERROR Unexpected exception, exiting abnormally 
(org.apache.zookeeper.server.quorum.QuorumPeerMain)
java.lang.RuntimeException: Unable to run quorum server
    at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:649)
    at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:591)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:164)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
    at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
Caused by: java.io.IOException: The accepted epoch, 13 is less than the current epoch, 14
    at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)
    ... 4 more

我是否必须修补它（我不确定是否有准备好的补丁），或者我是否可以修复 zookeeper 数据（例如，以某种方式让它接受新的时代）并继续使用相同的版本？

答案1

它起作用了，我刚刚做了：

cp currentEpoch acceptedEpoch

在 zookeeper 数据目录中，它启动时没有任何问题。

答案2

我注意到了http://zookeeper-user.578899.n2.nabble.com/acceptedEpoch-and-currentEpoch-values-not-matching-exception-message-td7581567.html，Otis Gospodnetic 说我可以删除这两个文件（currentEpoch 和 acceptedEpoch）并重新启动，这样可能会恢复 zookeeper，但 Flavio Junqueira 说我不应该这么做。我想我还是会尝试一下。

答案3

这确实解决了问题，

cp ~/zookeeper/version-2/currentEpoch ~/zookeeper/version-2/acceptedEpoch

造成此问题的实际原因是 zookeeper 节点之间的时间同步

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