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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8426) Opening a region failed on "Metrics source RegionServer,sub=Regions already exists!"
Date Wed, 24 Apr 2013 23:09:13 GMT
Jean-Daniel Cryans created HBASE-8426:
-----------------------------------------

             Summary: 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
            Priority: Critical
             Fix For: 0.98.0, 0.95.1
         Attachments: 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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