The current epoch, 8, is older than the last zxid, 38654705667_the current epoch,8b,is older tha the lst zxid-优快云博客

本文链接：https://blog.youkuaiyun.com/wangxj_2017/article/details/77046295

本文记录了一次ZooKeeper启动失败的经历，并给出了具体的错误信息。通过分析发现，问题在于数据目录下的version-2文件夹导致数据库加载失败。最终通过删除该文件夹解决了启动问题。

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今天遇到一个zookeeper启动的问题

Reading snapshot /usr/local/zk/data/version-2/snapshot.800000003

2017-08-09 21:15:01,955 [myid:1] - ERROR [main:QuorumPeer@453] - Unable to load database on disk
java.io.IOException: The current epoch, 8, is older than the last zxid, 38654705667
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:435)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:409)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:156)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:79)
2017-08-09 21:15:01,966 [myid:1] - ERROR [main:QuorumPeerMain@94] - Unexpected exception, exiting abnormally
java.lang.RuntimeException: Unable to run quorum server
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:454)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:409)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:156)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:79)
Caused by: java.io.IOException: The current epoch, 8, is older than the last zxid, 38654705667
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:435)

... 4 more

之前zookeeper 是可以正常启动的，今天启动zookeeper时报如上错误。经过测试发现：

只要在/usr/local/zk/data/ 下删除文件夹version-2 ： rm -rf version-2

然后就可以正常启动zookeeper了。