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https://issues.apache.org/jira/browse/HBASE-24402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113681#comment-17113681
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Jeongdae Kim commented on HBASE-24402:
--------------------------------------
[~vincentpoon] [~enis] Can you take a look at this issue? I think other
versions also have this issue.
> Moving the meta region causes MetricsException when using above 2.6.0 hadoop
> version
> ------------------------------------------------------------------------------------
>
> Key: HBASE-24402
> URL: https://issues.apache.org/jira/browse/HBASE-24402
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.4.13
> Reporter: Jeongdae Kim
> Assignee: Jeongdae Kim
> Priority: Minor
>
> When the meta region moved out from a region server then moved in to the one
> again, we got MetricsException below and the metric source for coprocessor
> couldn't be re-registered. it happened with hadoop 2.8.5
> {noformat}
> 2020-04-21 15:13:02,956 WARN [HBase-Metrics2-1] util.MBeans: Error creating
> MBean object name:
> Hadoop:service=HBase,name=RegionServer,sub=Coprocessor.Region.C
> P_org.apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint
> org.apache.hadoop.metrics2.MetricsException:
> org.apache.hadoop.metrics2.MetricsException:
> Hadoop:service=HBase,name=RegionServer,sub=Coprocessor.Region.CP_org.
> apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint already exists!
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newObjectName(DefaultMetricsSystem.java:127)
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newMBeanName(DefaultMetricsSystem.java:102)
> at org.apache.hadoop.metrics2.util.MBeans.getMBeanName(MBeans.java:121)
> at org.apache.hadoop.metrics2.util.MBeans.register(MBeans.java:64)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.startMBeans(MetricsSourceAdapter.java:222)
> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.start(MetricsSourceAdapter.java:100)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.registerSource(MetricsSystemImpl.java:268)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl$1.postStart(MetricsSystemImpl.java:239)
> at jdk.internal.reflect.GeneratedMethodAccessor82.invoke(Unknown Source)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl$3.invoke(MetricsSystemImpl.java:320)
> at com.sun.proxy.$Proxy10.postStart(Unknown Source)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.start(MetricsSystemImpl.java:193)
> at
> org.apache.hadoop.metrics2.impl.JmxCacheBuster$JmxCacheBusterRunnable.run(JmxCacheBuster.java:109)
> at
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at java.base/java.lang.Thread.run(Thread.java:834)
> {noformat}
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