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https://issues.apache.org/jira/browse/HBASE-8426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642358#comment-13642358
]
Elliott Clark commented on HBASE-8426:
--------------------------------------
Submitting to QA to see what it says.
> 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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