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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13531) After 4/18/15 merge, flakey failures of TestAcidGuarantees#testMobScanAtomicity
Date Wed, 06 May 2015 16:03:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14530786#comment-14530786
] 

Jingcheng Du commented on HBASE-13531:
--------------------------------------

Hi Jon, [~jmhsieh].
In the CellSkipListSet, the sequenceId is counted in comparing, so different cells with the
same row key but different seqId can stay in the same CellSkipListSet.
So I think the violation is caused by the missed readPt when we read cells from MOB files.
Here is the possible scenario, all the cell has the same row key.
# A.cell0 is added, its seqId is 0.
# A scanner s0 is opend, its readPt is 0, but now start to read this cell0.
# Now another cell1 is added, its seqId is 1.
# Now memstore is flushed, these two cells are in the same mob file.
# The s0 starts to read cell0, and find the mob file.
# Seek the row key in the mob file, we don't use the readPt, so the cell1 is found.

I think this can happen. Please advise, Jon.
I will look into the code and fix the readPt in mob file.

> After 4/18/15 merge, flakey failures of TestAcidGuarantees#testMobScanAtomicity
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-13531
>                 URL: https://issues.apache.org/jira/browse/HBASE-13531
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>    Affects Versions: hbase-11339
>            Reporter: Jonathan Hsieh
>             Fix For: hbase-11339
>
>
> After the merge of master from 4/18/15 with hbase-11339 branch, we encounter some atomicity
violations.  We want to fix before calling merge to trunk.



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