问题描述：
线上环境使用的是cdh搭建的集群，今天zookeeper报错“no space left on device”，经查为zookeeper的datadir的默认目录（/var/lib/zookeeper）空间所剩无几导致，重新调整了数据的存储目录再次启动，报如下错误：
2018-05-07 11:25:07,425 INFO org.apache.zookeeper.server.quorum.QuorumPeerConfig: Reading configuration from: /var/run/cloudera-scm-agent/process/604-zookeeper-server/zoo.cfg
2018-05-07 11:25:07,446 INFO org.apache.zookeeper.server.quorum.QuorumPeerConfig: Defaulting to majority quorums
2018-05-07 11:25:07,453 INFO org.apache.zookeeper.server.DatadirCleanupManager: autopurge.snapRetainCount set to 5
2018-05-07 11:25:07,453 INFO org.apache.zookeeper.server.DatadirCleanupManager: autopurge.purgeInterval set to 24
2018-05-07 11:25:07,454 INFO org.apache.zookeeper.server.DatadirCleanupManager: Purge task started.
2018-05-07 11:25:07,460 ERROR org.apache.zookeeper.server.DatadirCleanupManager: Error occured while purging.
org.apache.zookeeper.server.persistence.FileTxnSnapLog$DatadirException: Missing snap directory /data/var/lib/zookeeper/version-2, automatic data directory creation is disabled (zookeeper.datadir.autocreate is false). Please create this directory manually.
at org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:122)
at org.apache.zookeeper.server.PurgeTxnLog.purge(PurgeTxnLog.java:68)
at org.apache.zookeeper.server.DatadirCleanupManager$PurgeTask.run(DatadirCleanupManager.java:140)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
2018-05-07 11:25:07,474 INFO org.apache.zookeeper.server.DatadirCleanupManager: Purge task completed.
2018-05-07 11:25:07,483 INFO org.apache.zookeeper.server.quorum.QuorumPeerMain: Starting quorum peer
2018-05-07 11:25:07,497 INFO org.apache.zookeeper.server.NIOServerCnxnFactory: binding to port 0.0.0.0/0.0.0.0:2181
2018-05-07 11:25:07,512 ERROR org.apache.zookeeper.server.quorum.QuorumPeerMain: Unable to access datadir, exiting abnormally
org.apache.zookeeper.server.persistence.FileTxnSnapLog$DatadirException: Missing snap directory /data/var/lib/zookeeper/version-2, automatic data directory creation is disabled (zookeeper.datadir.autocreate is false). Please create this directory manually.
at org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:122)
at org.apache.zookeeper.server.quorum.QuorumPeer.<init>(QuorumPeer.java:490)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:138)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:79)