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https://issues.apache.org/jira/browse/HBASE-3587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001173#comment-13001173
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Mingjie Lai commented on HBASE-3587:
------------------------------------
stack.
It's been in trunk for a while. Do you see the crazy-CPU-burning recently? From
unit tests or at a cluster?
> Eliminate use of ReadWriteLock in RegionObserver coprocessor invocation
> -----------------------------------------------------------------------
>
> Key: HBASE-3587
> URL: https://issues.apache.org/jira/browse/HBASE-3587
> Project: HBase
> Issue Type: Improvement
> Components: coprocessors
> Reporter: Gary Helmling
>
> Follow-up to a discussion on the dev list:
> http://search-hadoop.com/m/jOovV1uAJBP
> The CoprocessorHost ReentrantReadWriteLock is imposing some overhead on data
> read/write operations, even when no coprocessors are loaded. Currently
> execution of RegionCoprocessorHost pre/postXXX() methods are guarded by
> acquiring the coprocessor read lock. This is used to prevent coprocessor
> registration from modifying the coprocessor collection while upcall hooks are
> in progress.
> On further discussion, and looking at the locking in HRegion, it should be
> sufficient to just use a CopyOnWriteArrayList for the coprocessor collection.
> We can then remove the coprocessor lock and eliminate the associated
> overhead without having to special case the "no loaded coprocessors"
> condition.
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