问题：一个 ZK启动不了 ， 在 zookeeper.out 中 报了如下的 异常
2020-01-21 18:39:59,277 [myid:2] - ERROR [main:QuorumPeer@557] - Unable to load database on disk
java.io.IOException: Found T1 in /export/servers/zookeeper-3.4.9/zkdatas/version-2/currentEpoch
at org.apache.zookeeper.server.quorum.QuorumPeer.readLongFromFile(QuorumPeer.java:1219)
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:516)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:500)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:153)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
2020-01-21 18:39:59,290 [myid:2] - ERROR [main:QuorumPeerMain@89] - Unexpected exception, exiting abnormally
java.lang.RuntimeException: Unable to run quorum server
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:558)
at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:500)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:153)
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: Found T1 in /export/servers/zookeeper-3.4.9/zkdatas/version-2/currentEpoch
at org.apache.zookeeper.server.quorum.QuorumPeer.readLongFromFile(QuorumPeer.java:1219)
at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:516)
... 4 more解决 ：删除 /export/servers/zookeeper-3.4.9/zkdatas/version-2 下的 所有文件，重新启动
/export/servers/zookeeper-3.4.9/zkdatas/version-2
查看启动 状况：
