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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15451) Remove unnecessary wait in MVCC
Date Sun, 13 Mar 2016 11:05:33 GMT
Yu Li created HBASE-15451:
-----------------------------

             Summary: Remove unnecessary wait in MVCC
                 Key: HBASE-15451
                 URL: https://issues.apache.org/jira/browse/HBASE-15451
             Project: HBase
          Issue Type: Improvement
    Affects Versions: 1.2.0, 2.0.0
            Reporter: Yu Li
            Assignee: Yu Li


Currently the return value of MVCC#complete indicates whether readPoint already advanced over
write number of the given WriteEntry:
{code}
return readPoint.get() >= writeEntry.getWriteNumber();
{code}
While in MVCC#checkAndWait we never take usage of this but always call waitForRead which will
acquire and release lock on {{readWaiters}} and cause additional context switch. This JIRA
will improve this logic and remove the unnecessary wait. 



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