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https://issues.apache.org/jira/browse/ZOOKEEPER-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15181457#comment-15181457
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Rakesh R commented on ZOOKEEPER-2247:
-------------------------------------
Thanks [~cnauroth] for the reviews.
bq. I have one question on the branch-3.4 patch. I see this is removing the
System#exit call from SyncRequestProcessor
This was actually missed during the ZOOKEEPER-602 backport to {{branch-3.4}}.
Now, I've got the chance to cleanup {{System#exit}} call. As we know with this
patch it is giving another chance to do the re-election after hitting
unrecoverable errors. So this call is not required.
> 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: Arshad Mohammad
> Assignee: Rakesh R
> Priority: Critical
> Fix For: 3.4.9, 3.5.2, 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-b3.5.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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