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From "Misty Stanley-Jones (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7050) Document locking of HRegion
Date Thu, 05 Jun 2014 01:43:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018403#comment-14018403
] 

Misty Stanley-Jones commented on HBASE-7050:
--------------------------------------------

Can you share what you have come up with so far? Or a good source for this info?

> Document locking of HRegion
> ---------------------------
>
>                 Key: HBASE-7050
>                 URL: https://issues.apache.org/jira/browse/HBASE-7050
>             Project: HBase
>          Issue Type: Task
>          Components: documentation, Transactions/MVCC
>            Reporter: Gregory Chanan
>            Priority: Minor
>
> Would be good to have some documentation on the locking in HRegion.  In particular, the
updateLock and the row locks.
> With the optimizations that have been made, e.g. HBASE-5541 this isn't straightforward.
> When do these locks need to be held?  What structures do they protect access to?  Why
does the updateLock not need to be held during rollback?  Those sorts of questions.
> I've started do to some of this, but haven't fully fleshed it out.



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