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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5569) TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally
Date Wed, 14 Mar 2012 22:28:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229703#comment-13229703
] 

Lars Hofhansl commented on HBASE-5569:
--------------------------------------

If I remove the scanning from the tests the times are back to what it was before, suggesting
that the extra work is due to keeping (and flushing) deleted cells that cannot be collected
because they are part of a scan.

I'm happy with this outcome, and I would like to commit this change. 
Ted +1'd, I'm +1 (obviously), but it wouldn't hurt to have another pair of eyes or two looking
at this.
                
> TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally
> -----------------------------------------------------------------------
>
>                 Key: HBASE-5569
>                 URL: https://issues.apache.org/jira/browse/HBASE-5569
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>         Attachments: 5569.txt, TestAtomicOperation-output.trunk_120313.rar
>
>
> What I pieced together so far is that it is the *scanning* side that has problems sometimes.
> Every time I see a assertion failure in the log I see this before:
> {quote}
> 2012-03-12 21:48:49,523 DEBUG [Thread-211] regionserver.StoreScanner(499): Storescanner.peek()
is changed where before = rowB/colfamily11:qual1/75366/Put/vlen=6,and after = rowB/colfamily11:qual1/75203/DeleteColumn/vlen=0
> {quote}
> The order of if the Put and Delete is sometimes reversed.
> The test threads should always see exactly one KV, if the "before" was the Put the thread
see 0 KVs, if the "before" was the Delete the threads see 2 KVs.
> This debug message comes from StoreScanner to checkReseek. It seems we still some consistency
issue with scanning sometimes :(

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