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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12751) Allow RowLock to be reader writer
Date Tue, 23 Dec 2014 17:00:18 GMT
Elliott Clark created HBASE-12751:
-------------------------------------

             Summary: 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


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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