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From: "Elliott Clark (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Updated] (HBASE-8426) Opening a region failed on "Metrics
 source RegionServer,sub=Regions already exists!"
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     [ https://issues.apache.org/jira/browse/HBASE-8426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Elliott Clark updated HBASE-8426:
---------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed
          Status: Resolved  (was: Patch Available)

Thanks for the testing JD.  Comitted to trunk and 0.95
                
> Opening a region failed on "Metrics source RegionServer,sub=Regions already exists!"
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-8426
>                 URL: https://issues.apache.org/jira/browse/HBASE-8426
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.95.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: Elliott Clark
>            Priority: Critical
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: HBASE-8426-0.patch, HBASE-8426-1.patch, metrics_already_exist.txt
>
>
> I restarted a cluster on 0.95 (1ecd4c7e0b22bba75c76f2fc2ce369541502b6df) and some regions failed to open on their first assignment on an exception like:
> {noformat}
> Caused by: org.apache.hadoop.metrics2.MetricsException: Metrics source RegionServer,sub=Regions already exists!
> 	at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:126)
> 	at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:107)
> 	at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:217)
> 	at org.apache.hadoop.hbase.metrics.BaseSourceImpl.<init>(BaseSourceImpl.java:75)
> 	at org.apache.hadoop.hbase.regionserver.MetricsRegionAggregateSourceImpl.<init>(MetricsRegionAggregateSourceImpl.java:49)
> 	at org.apache.hadoop.hbase.regionserver.MetricsRegionAggregateSourceImpl.<init>(MetricsRegionAggregateSourceImpl.java:41)
> 	at org.apache.hadoop.hbase.regionserver.MetricsRegionServerSourceFactoryImpl.getAggregate(MetricsRegionServerSourceFactoryImpl.java:33)
> 	at org.apache.hadoop.hbase.regionserver.MetricsRegionServerSourceFactoryImpl.createRegion(MetricsRegionServerSourceFactoryImpl.java:50)
> 	at org.apache.hadoop.hbase.regionserver.MetricsRegion.<init>(MetricsRegion.java:35)
> 	at org.apache.hadoop.hbase.regionserver.HRegion.<init>(HRegion.java:488)
> 	at org.apache.hadoop.hbase.regionserver.HRegion.<init>(HRegion.java:400)
> {noformat}
> I'm attaching a bigger log.

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