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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2247) Zookeeper service becomes unavailable when leader fails to write transaction log
Date Sat, 08 Jul 2017 20:54:02 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16079311#comment-16079311
] 

ASF GitHub Bot commented on ZOOKEEPER-2247:
-------------------------------------------

Github user hanm commented on the issue:

    https://github.com/apache/zookeeper/pull/65
  
    @rakeshadr I think this pr can be closed because it's merged already.


> Zookeeper service becomes unavailable when leader fails to write transaction log
> --------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2247
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2247
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.5.0
>            Reporter: Mohammad Arshad
>            Assignee: Rakesh R
>            Priority: Critical
>             Fix For: 3.4.9, 3.5.3, 3.6.0
>
>         Attachments: ZOOKEEPER-2247-01.patch, ZOOKEEPER-2247-02.patch, ZOOKEEPER-2247-03.patch,
ZOOKEEPER-2247-04.patch, ZOOKEEPER-2247-05.patch, ZOOKEEPER-2247-06.patch, ZOOKEEPER-2247-07.patch,
ZOOKEEPER-2247-09.patch, ZOOKEEPER-2247-10.patch, ZOOKEEPER-2247-11.patch, ZOOKEEPER-2247-12.patch,
ZOOKEEPER-2247-13.patch, ZOOKEEPER-2247-14.patch, ZOOKEEPER-2247-15.patch, ZOOKEEPER-2247-16.patch,
ZOOKEEPER-2247-17.patch, ZOOKEEPER-2247-18.patch, ZOOKEEPER-2247-19.patch, ZOOKEEPER-2247-20.patch,
ZOOKEEPER-2247-21.patch, ZOOKEEPER-2247-22.patch, ZOOKEEPER-2247-23.patch, ZOOKEEPER-2247-b3.5.patch,
ZOOKEEPER-2247-br-3.4.patch, ZOOKEEPER-2247-br-3.4.patch
>
>
> Zookeeper service becomes unavailable when leader fails to write transaction log. Bellow
are the exceptions
> {code}
> 2015-08-14 15:41:18,556 [myid:100] - ERROR [SyncThread:100:ZooKeeperCriticalThread@48]
- Severe unrecoverable error, from thread : SyncThread:100
> java.io.IOException: Input/output error
> 	at sun.nio.ch.FileDispatcherImpl.force0(Native Method)
> 	at sun.nio.ch.FileDispatcherImpl.force(FileDispatcherImpl.java:76)
> 	at sun.nio.ch.FileChannelImpl.force(FileChannelImpl.java:376)
> 	at org.apache.zookeeper.server.persistence.FileTxnLog.commit(FileTxnLog.java:331)
> 	at org.apache.zookeeper.server.persistence.FileTxnSnapLog.commit(FileTxnSnapLog.java:380)
> 	at org.apache.zookeeper.server.ZKDatabase.commit(ZKDatabase.java:563)
> 	at org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:178)
> 	at org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:113)
> 2015-08-14 15:41:18,559 [myid:100] - INFO  [SyncThread:100:ZooKeeperServer$ZooKeeperServerListenerImpl@500]
- Thread SyncThread:100 exits, error code 1
> 2015-08-14 15:41:18,559 [myid:100] - INFO  [SyncThread:100:ZooKeeperServer@523] - shutting
down
> 2015-08-14 15:41:18,560 [myid:100] - INFO  [SyncThread:100:SessionTrackerImpl@232] -
Shutting down
> 2015-08-14 15:41:18,560 [myid:100] - INFO  [SyncThread:100:LeaderRequestProcessor@77]
- Shutting down
> 2015-08-14 15:41:18,560 [myid:100] - INFO  [SyncThread:100:PrepRequestProcessor@1035]
- Shutting down
> 2015-08-14 15:41:18,560 [myid:100] - INFO  [SyncThread:100:ProposalRequestProcessor@88]
- Shutting down
> 2015-08-14 15:41:18,561 [myid:100] - INFO  [SyncThread:100:CommitProcessor@356] - Shutting
down
> 2015-08-14 15:41:18,561 [myid:100] - INFO  [CommitProcessor:100:CommitProcessor@191]
- CommitProcessor exited loop!
> 2015-08-14 15:41:18,562 [myid:100] - INFO  [SyncThread:100:Leader$ToBeAppliedRequestProcessor@915]
- Shutting down
> 2015-08-14 15:41:18,562 [myid:100] - INFO  [SyncThread:100:FinalRequestProcessor@646]
- shutdown of request processor complete
> 2015-08-14 15:41:18,562 [myid:100] - INFO  [SyncThread:100:SyncRequestProcessor@191]
- Shutting down
> 2015-08-14 15:41:18,563 [myid:100] - INFO  [ProcessThread(sid:100 cport:-1)::PrepRequestProcessor@159]
- PrepRequestProcessor exited loop!
> {code}
> After this exception Leader server still remains leader. After this non recoverable exception
the leader should go down and let other followers become leader.



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