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https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378539#comment-14378539
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Enis Soztutar commented on HBASE-12751:
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bq. You looking at the rerdering then Elliott Clark?
My first POC patch at HBASE-8763 does the reorder. I believe the approach over
there is still viable. However, I was not able to do a proper perf analysis of
the approach though. Jeff took over the patch to not change the ordering (which
is a bigger change definitely). After the disruptor, we had to do the
mock-append as a workaround.
> Allow RowLock to be reader writer
> ---------------------------------
>
> Key: HBASE-12751
> URL: https://issues.apache.org/jira/browse/HBASE-12751
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Attachments: HBASE-12751-v1.patch, HBASE-12751.patch
>
>
> Right now every write operation grabs a row lock. This is to prevent values
> from changing during a read modify write operation (increment or check and
> put). However it limits parallelism in several different scenarios.
> If there are several puts to the same row but different columns or stores
> then this is very limiting.
> If there are puts to the same column then mvcc number should ensure a
> consistent ordering. So locking is not needed.
> However locking for check and put or increment is still needed.
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