Arshad Mohammad created ZOOKEEPER-2247:
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Summary: 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: Arshad Mohammad
Priority: Critical
Fix For: 3.5.2
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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