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From "Gregory Chanan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7077) checkAndPut should properly integrate with MVCC
Date Wed, 31 Oct 2012 20:27:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488192#comment-13488192

Gregory Chanan commented on HBASE-7077:

The test references HBASE-7071, but that is not related.  Change it to reference HBASE-7051?
> checkAndPut should properly integrate with MVCC
> -----------------------------------------------
>                 Key: HBASE-7077
>                 URL: https://issues.apache.org/jira/browse/HBASE-7077
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Gregory Chanan
>             Fix For: 0.96.0
>         Attachments: HBASE-7071.patch, HBASE-7071_testcasewithassert.patch
> checkAndPut should integrate with MVCC, similar to how HBASE-4583 fixed appends and increments.
> Also need a test, here's one we could use (originally proposed in HBASE-7051):
> The current value of some cell is 10.
> I issue two concurrent requests:
> A) a check and put where check value = 10, put value = 11
> B) a put where put value = 50
> The only result at the end of these operations that seems reasonable to me is the value
of the cell being 50. If A occurred first (ACID wise), then our values go 10->11->50.
If B occurred first, then our values go 10->50 (and the checkAndPut fails)

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