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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15451) Remove unnecessary wait in MVCC
Date Sun, 13 Mar 2016 11:21:33 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yu Li updated HBASE-15451:
--------------------------
    Status: Patch Available  (was: Open)

Submit patch for HadoopQA

> 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
>         Attachments: HBASE-15451.patch, HBASE-15451.test
>
>
> 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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