动物园管理员-错误的当前时代，是旧的最后一个zxid。

Question

我正在使用一个由3个节点组成的动物园管理员集合，运行3.4.13。有时，在机器重新启动后，动物园管理员不会在其中一个节点启动，我在日志中看到下面的错误。

2019-08-19 04:18:36,906 [myid:2] - ERROR [main:QuorumPeer@692] - Unable to load database on disk
java.io.IOException: The current epoch, 7, is older than the last zxid, 34359738370
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:674)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:635)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
2019-08-19 04:18:36,908 [myid:2] - ERROR [main:QuorumPeerMain@92] - Unexpected exception, exiting abnormally
java.lang.RuntimeException: Unable to run quorum server
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:693)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:635)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
Caused by: java.io.IOException: The current epoch, 7, is older than the last zxid, 34359738370
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:674)
... 4 more----

我见过动物园管理员-2354，症状看起来很相似。

support@platform2:/var/lib/zookeeper/version-2$ sudo cat acceptedEpoch
8support@platform2:/var/lib/zookeeper/version-2$ sudo cat currentEpoch
7support@platform2:/var/lib/zookeeper/version-2$ sudo cat currentEpoch.tmp
8support@platform2

上述问题表明，问题是固定在3.4.6，但我观察到同样的3.4.13。

有人能告诉我怎么才能从这里恢复动物园管理员节点吗？

Answer 1

这已经在动物园管理员邮寄线程中讨论过了。与此相关的引用

随着另外两个动物园管理员服务器的运行，我停止了坏掉的节点中的动物园管理员，删除了/var/lib/zookeeper/version-2中的所有内容，并在节点上启动了动物园管理员。它现在运行良好，并从其他服务器获取所有数据。