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https://issues.apache.org/jira/browse/ZOOKEEPER-2925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16224377#comment-16224377
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Mohammad Arshad commented on ZOOKEEPER-2925:
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[~rthille] Thanks for reporting this issue.
I also faced this issue recently. This issue is in all the branches. Can you
raise pull request. I will be happy review it.
> ZooKeeper server fails to start on first-startup due to race to create
> dataDir & snapDir
> ----------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2925
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2925
> Project: ZooKeeper
> Issue Type: Bug
> Components: other
> Affects Versions: 3.4.6
> Reporter: Robert P. Thille
> Labels: easyfix, newbie, patch
> Fix For: 3.4.10
>
> Attachments: ZOOKEEPER-2925.patch
>
>
> Due to two threads trying to create the dataDir and snapDir, and the
> java.io.File.mkdirs() call returning false both for errors and for the
> directory already existing, sometimes ZooKeeper will fail to start with the
> following stack trace:
> {noformat}
> 2017-10-25 22:30:40,069 [myid:] - INFO [main:ZooKeeperServerMain@95] -
> Starting server
> 2017-10-25 22:30:40,075 [myid:] - INFO [main:Environment@100] - Server
> environment:zookeeper.version=3.4.6-mdavis8efb625--1, built on 10/25/2017
> 01:12 GMT
> [ More 'Server environment:blah blah blah' messages trimmed]
> 2017-10-25 22:30:40,077 [myid:] - INFO [main:Environment@100] - Server
> environment:user.dir=/
> 2017-10-25 22:30:40,081 [myid:] - ERROR [main:ZooKeeperServerMain@63] -
> Unexpected exception, exiting abnormally
> java.io.IOException: Unable to create data directory /bp2/data/version-2
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:85)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:104)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
> at
> org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
> 2017-10-25 22:30:40,085 [myid:] - INFO
> [PurgeTask:DatadirCleanupManager$PurgeTask@144] - Purge task completed.
> {noformat}
> this is caused by the QuorumPeerMain thread and the PurgeTask thread both
> competing to create the directories.
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