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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-997) Count versions with same r/c/ts as one instance with most recent addition the winner
Date Wed, 08 Sep 2010 17:25:34 GMT

     [ https://issues.apache.org/jira/browse/HBASE-997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray resolved HBASE-997.
---------------------------------

     Hadoop Flags: [Incompatible change, Reviewed]  (was: [Incompatible change])
    Fix Version/s: 0.90.0
       Resolution: Fixed

Fixed with commit of HBASE-1485.

> Count versions with same r/c/ts as one instance with most recent addition the winner
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-997
>                 URL: https://issues.apache.org/jira/browse/HBASE-997
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Assignee: Pranav Khaitan
>             Fix For: 0.90.0
>
>
> A few of us were chatting yesterday.  If two edits go into hbase with same r/c/ts and
they both go into the same memcache instance -- i.e. there has not been a flush between additions
-- then the last insert will overwrite any added earlier (edits go into a Map).  That seems
fine to me (what others think?).  But if a flush happens in between edits, hbase gives back
different answers.  Here's how.
> Each instance of a cell is treated as a 'version', even if same r/c/ts.  If you ask for
N > 1 versions, and if two cells of same r/c/ts, only there has been a flush between their
additions, you'll get back two versions with same r/c/ts.  If no flush between their upload,
you'll get back one version only because the later overrode the former.
> This issue is about closing this hole.  Suppress same r/c/ts when returning 'versions'.

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