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https://issues.apache.org/jira/browse/HBASE-12981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-12981:
--------------------------
Attachment: 12981.0.98.txt
Patch for 0.98.
Logs (every minute) if we come across a negative index. Outputs the inputs used
in the modulo so we can get better understanding.
> FSHLog: UNEXPECTED java.lang.ArrayIndexOutOfBoundsException: -4
> ---------------------------------------------------------------
>
> Key: HBASE-12981
> URL: https://issues.apache.org/jira/browse/HBASE-12981
> Project: HBase
> Issue Type: Bug
> Components: wal
> Affects Versions: 0.98.10
> Reporter: stack
> Assignee: stack
> Fix For: 0.98.11
>
> Attachments: 12981.0.98.txt
>
>
> A user reported the below. It happens after the RS has been running a while.
> 015-01-20 22:33:23,031 ERROR org.apache.hadoop.hbase.regionserver.wal.FSHLog:
> UNEXPECTED
> java.lang.ArrayIndexOutOfBoundsException: -4
> at
> org.apache.hadoop.hbase.regionserver.wal.FSHLog$AsyncWriter.run(FSHLog.java:1149)
> at java.lang.Thread.run(Thread.java:745)
> 2015-01-20 22:33:23,035 INFO org.apache.hadoop.hbase.regionserver.wal.FSHLog:
> regionserver60020-WAL.AsyncWriter exiting
> ##################
> Similarly on Node 23 - on 12-20-2014 05:13:
> 2014-12-20 05:13:40,715 ERROR
> org.apache.hadoop.hbase.regionserver.wal.FSHLog: UNEXPECTED
> java.lang.ArrayIndexOutOfBoundsException: -3
> at
> org.apache.hadoop.hbase.regionserver.wal.FSHLog$AsyncWriter.run(FSHLog.java:1149)
> at java.lang.Thread.run(Thread.java:745)
> ###################
> Looking in code, I can't see how this could come about other than our write
> seqid ran over the top of a long (unlikely). I think this a 0.98 issue since
> 1.0+ is different here. It does:
> int index = Math.abs(this.syncRunnerIndex++) % this.syncRunners.length;
> I'm going to add logging of the circumstance that produces a negative index
> and then defense against our using negative indices; there could be more
> going on in here, more than I can see.
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