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Posted to dev@zookeeper.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/03/17 23:12:41 UTC
[jira] [Commented] (ZOOKEEPER-1936) Server exits when unable to
create data directory due to race
[ https://issues.apache.org/jira/browse/ZOOKEEPER-1936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15930873#comment-15930873 ]
ASF GitHub Bot commented on ZOOKEEPER-1936:
-------------------------------------------
Github user Humbedooh closed the pull request at:
https://github.com/apache/zookeeper/pull/75
> Server exits when unable to create data directory due to race
> --------------------------------------------------------------
>
> Key: ZOOKEEPER-1936
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1936
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.6, 3.5.0
> Reporter: Harald Musum
> Assignee: Ted Yu
> Priority: Minor
> Fix For: 3.5.4, 3.6.0
>
> Attachments: ZOOKEEPER-1936.branch-3.4.patch, ZOOKEEPER-1936.patch, ZOOKEEPER-1936.v2.patch, ZOOKEEPER-1936.v3.patch, ZOOKEEPER-1936.v3.patch, ZOOKEEPER-1936.v4.patch, ZOOKEEPER-1936.v5.patch
>
>
> We sometime see issues with ZooKeeper server not starting and seeing this error in the log:
> [2014-05-27 09:29:48.248] ERROR : -
> .org.apache.zookeeper.server.ZooKeeperServerMain Unexpected exception,
> exiting abnormally\nexception=\njava.io.IOException: Unable to create data
> directory /home/y/var/zookeeper/version-2\n\tat
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:85)\n\tat
> org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:103)\n\tat
> org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)\n\tat
> org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)\n\tat
> org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)\n\tat
> org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)\n\t
> [...]
> Stack trace from JVM gives this:
> "PurgeTask" daemon prio=10 tid=0x000000000201d000 nid=0x1727 runnable
> [0x00007f55d7dc7000]
> java.lang.Thread.State: RUNNABLE
> at java.io.UnixFileSystem.createDirectory(Native Method)
> at java.io.File.mkdir(File.java:1310)
> at java.io.File.mkdirs(File.java:1337)
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:84)
> 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)
> "zookeeper server" prio=10 tid=0x00000000027df800 nid=0x1715 runnable
> [0x00007f55d7ed8000]
> java.lang.Thread.State: RUNNABLE
> at java.io.UnixFileSystem.createDirectory(Native Method)
> at java.io.File.mkdir(File.java:1310)
> at java.io.File.mkdirs(File.java:1337)
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.<init>(FileTxnSnapLog.java:84)
> at
> org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:103)
> 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)
> [...]
> So it seems that when autopurge is used (as it is in our case), it might happen at the same time as starting the server itself. In FileTxnSnapLog() it will check if the directory exists and create it if not. These two tasks do this at the same time, and mkdir fails and server exits the JVM.
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