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From "stack (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5535) Make the functions in task monitor synchronized
Date Fri, 09 Mar 2012 22:50:57 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-5535:
-------------------------

       Resolution: Fixed
    Fix Version/s: 0.94.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Thanks for the patch Liyin.  Committed 0.94 and trunk.  Will include in 0.92.2.
                
> Make the functions in task monitor synchronized
> -----------------------------------------------
>
>                 Key: HBASE-5535
>                 URL: https://issues.apache.org/jira/browse/HBASE-5535
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Liyin Tang
>            Assignee: Liyin Tang
>             Fix For: 0.94.0
>
>         Attachments: HBASE-5535-Make-the-functions-in-task-monitor-synchr-2012-03-08_16_33_42.patch
>
>
> There are some potential race condition in the task monitor. So update the functions
in task monitor to be synchronized.
> The example of the problem caused by the race condition:
> ERROR org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Cache flush failed for region

> java.lang.IndexOutOfBoundsException: Index: 1745, Size: 1744
> at java.util.ArrayList.add(ArrayList.java:367)
> at java.util.SubList.add(AbstractList.java:633)
> at java.util.SubList.add(AbstractList.java:633)
> at java.util.SubList.add(AbstractList.java:633)
> at java.util.SubList.add(AbstractList.java:633)
> at java.util.SubList.add(AbstractList.java:633)
> at java.util.AbstractList.add(AbstractList.java:91)
> at org.apache.hadoop.hbase.monitoring.TaskMonitor.createStatus(TaskMonitor.java:74)
> at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1139)
> at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:260)
> at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:234)
> at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:146)

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