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https://issues.apache.org/jira/browse/HBASE-16161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15358433#comment-15358433
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stack commented on HBASE-16161:
-------------------------------
Remove some unnecessary synchronizes.
M hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RpcServer.java
Remove synchronize on sendResponseIfReady, and Reader#doRunLoop.
The former is safe for many threads to call and doRunLoop has one thread
only except reading the 'adding' field.
M hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
Cache hashcode. Add hash code on region scanner (and equals)
Remove synchronize on the scanner close and next call.
Remove some dup'd code between handleException and close.
> Remove a few unnecessary (uncontended) synchronizes
> ---------------------------------------------------
>
> Key: HBASE-16161
> URL: https://issues.apache.org/jira/browse/HBASE-16161
> Project: HBase
> Issue Type: Bug
> Reporter: stack
> Attachments: HBASE-16161.branch-1.001.patch
>
>
> This is followon from HBASE-15716. We have a few odd looking synchronizes. A
> few are probably elided after analysis concludes single thread consumer but
> lets remove to be clear.
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