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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12981) FSHLog: UNEXPECTED java.lang.ArrayIndexOutOfBoundsException: -4
Date Fri, 06 Feb 2015 21:26:35 GMT
stack created HBASE-12981:
-----------------------------

             Summary: 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


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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