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https://issues.apache.org/jira/browse/HBASE-7871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614360#comment-13614360
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Ted Yu commented on HBASE-7871:
-------------------------------
I used the following command at the root of trunk to see where
getMetrics(MetricsBuilder metricsBuilder, boolean all) is called:
find . -name '*.java' -exec grep 'getMetrics(' {} \; -print | grep -v
'getMetrics()'
I only saw reference in tests, such as
hbase-hadoop1-compat/src/test/java/org/apache/hadoop/hbase/test/MetricsAssertHelperImpl.java,
etc.
> HBase can be stuck when closing regions concurrently
> -----------------------------------------------------
>
> Key: HBASE-7871
> URL: https://issues.apache.org/jira/browse/HBASE-7871
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.96.0
> Reporter: Nicolas Liochon
> Assignee: Ted Yu
> Priority: Critical
> Fix For: 0.95.0, 0.98.0
>
> Attachments: 7871.patch, 7871-v2.patch, s1.txt, TestStartStop.java
>
>
> The attached test fails ~1% of the the time on 0.96. It seems it does not
> fail on 0.94.5. It's simple: a table creation and some puts.
> I attach the stack. Logs says nothing it seems.
> The suspicious part is:
> {noformat}
> "RS_CLOSE_REGION-localhost,57575,1361197489166-2" prio=10
> tid=0x00007fb0c8775800 nid=0x61ac runnable [0x00007fb09f272000]
> java.lang.Thread.State: RUNNABLE
> at java.util.TreeMap.fixAfterDeletion(TreeMap.java:2193)
> at java.util.TreeMap.deleteEntry(TreeMap.java:2151)
> at java.util.TreeMap.remove(TreeMap.java:585)
> at java.util.TreeSet.remove(TreeSet.java:259)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegionAggregateSourceImpl.deregister(MetricsRegionAggregateSourceImpl.java:55)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegionSourceImpl.close(MetricsRegionSourceImpl.java:86)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegion.close(MetricsRegion.java:40)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1063)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:969)
> - locked <0x00000006944e2558> (a java.lang.Object)
> at
> org.apache.hadoop.hbase.regionserver.handler.CloseRegionHandler.process(CloseRegionHandler.java:146)
> at
> org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:203)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
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