[jira] [Commented] (HBASE-5569) TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally

["Lars Hofhansl (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-5569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228200#comment-13228200 ] 

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

Here's the other case.
{quote}
2012-03-13 01:34:06,674 DEBUG [Thread-287] regionserver.StoreScanner(499): Storescanner.peek() is changed where before = rowB/colfamily11:qual1/56043/DeleteColumn/vlen=0,and after = rowB/colfamily11:qual1/54931/Put/vlen=6
{quote}

Locally I have not been able to reproduce this, yet.
                
> TestAtomicOperation.testMultiRowMutationMultiThreads fails occasionally
> -----------------------------------------------------------------------
>
>                 Key: HBASE-5569
>                 URL: https://issues.apache.org/jira/browse/HBASE-5569
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Priority: Minor
>
> What I pieces 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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