[jira] [Commented] (HBASE-16161) Remove a few unnecessary (uncontended) synchronizes

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15358433#comment-15358433 ] 

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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