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https://issues.apache.org/jira/browse/HBASE-5569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228498#comment-13228498
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Lars Hofhansl commented on HBASE-5569:
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I'll run this in a loop on my work machine (8 core + hyperthreading), should
increase the likelihood of this happening.
Will then avoid the parallel flushing, and see of that fixes the problem.
I think the test always had this problem. On the other I do think this
indicates a problem with scanning.
This is suspicious, and the code producing this was also added relatively
recently:
{quote}
Storescanner.peek() is changed where before =
rowB/colfamily11:qual1/75366/Put/vlen=6,and after =
rowB/colfamily11:qual1/75203/DeleteColumn/vlen
{quote}
> 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 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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