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https://issues.apache.org/jira/browse/HBASE-12751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elliott Clark updated HBASE-12751:
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Attachment: HBASE-12751-v2.patch
Latest patch on phabricator. This will likely fail most tests.
Just putting this up to show some progress and get some early feedback. It
removes on atomic long, and one allocation on every write so it should be a win
(testing needed here).
> 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-v2.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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