zookeeper无法启动，报“Unable to load database on disk”
问题描述：部署zookeeper的服务器磁盘满了，引起服务异常，将zookeeper进程杀掉之后，重新启动zookeeper启动的时候显示成功了：
# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.10/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
但是zookeeper的进程和端口都没有起来。
查看zookeeper.out，发现有报错信息如下：
2018-05-07 10:33:58,556 - INFO - Reading snapshot /opt/data/zookeeper/version-2/snapshot.1900356f19
2018-05-07 10:33:58,966 - ERROR - Last transaction was partial.
2018-05-07 10:33:58,968 - ERROR - Unable to load database on disk
java.io.IOException: The accepted epoch, 19 is less than the current epoch, 3a
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)
2018-05-07 10:33:58,970 - ERROR - Unexpected exception, exiting abnormally
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, 19 is less than the current epoch, 3a
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:645)
... 4 more
#
经过网上查询，得到解决方法：
将zookeeper的version-2目录备份一份，再重新创建一个新的version-2目录，然后重新启动zookeeper。
操作如下：
# ll
total 28
-rw-r--r-- 1 root root 2 Aug 302017 myid
drwxr-xr-x 2 root root 24576 May7 10:36 version-2
-rw-r--r-- 1 root root 5 May7 10:42 zookeeper_server.pid
# mv version-2 version-2.bak
# ll
total 28
-rw-r--r-- 1 root root 2 Aug 302017 myid
drwxr-xr-x 2 root root 24576 May7 10:36 version-2.bak
-rw-r--r-- 1 root root 5 May7 10:42 zookeeper_server.pid
# mkdir version-2
# ll
total 28
-rw-r--r-- 1 root root 2 Aug 302017 myid
drwxr-xr-x 2 root root 6 May7 10:44 version-2
drwxr-xr-x 2 root root 24576 May7 10:36 version-2.bak
-rw-r--r-- 1 root root 5 May7 10:42 zookeeper_server.pid
然后重新启动zookeeper：
# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.4.10/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
# netstat -tlunp|grep 2181
tcp6 0 0 :::2181 :::* LISTEN 32695/java
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