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https://issues.apache.org/jira/browse/HBASE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265503#comment-13265503
]
Lars Hofhansl commented on HBASE-5897:
--------------------------------------
That's a huge stack dump. What sticks to me are these:
{code}
at
org.apache.hadoop.hbase.HBaseTestingUtility.shutdownMiniCluster(HBaseTestingUtility.java:711)
at
org.apache.hadoop.hbase.coprocessor.TestRegionServerCoprocessorExceptionWithRemove.teardownAfterClass(TestRegionServerCoprocessorExceptionWithRemove.java:77)
{code}
and
{code}
at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(Reen
trantReadWriteLock.java:807)
at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:929
)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:879)
- locked <7934dcbd0> (a java.lang.Object)
at
org.apache.hadoop.hbase.regionserver.handler.CloseRegionHandler.process(CloseRegionHandler.java:121)
{code}
On the face of it, it does seem unrelated.
> prePut coprocessor hook causing substantial CPU usage
> -----------------------------------------------------
>
> Key: HBASE-5897
> URL: https://issues.apache.org/jira/browse/HBASE-5897
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.92.2, 0.94.0, 0.96.0
>
> Attachments: 5897-simple.txt, hbase-5897.txt,
> testRegionServerCoprocessorExceptionWithRemove.stack
>
>
> I was running an insert workload against trunk under oprofile and saw that a
> significant portion of CPU usage was going to calling the "prePut"
> coprocessor hook inside doMiniBatchPut, even though I don't have any
> coprocessors installed. I ran a million-row insert and collected CPU time
> spent in the RS after commenting out the preput hook, and found CPU usage
> reduced by 33%.
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