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From "Jonathan Hsieh (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-2856) TestAcidGuarantee broken on trunk
Date Sat, 19 Nov 2011 00:52:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153282#comment-13153282
] 

Jonathan Hsieh commented on HBASE-2856:
---------------------------------------

I've been looping TestAcidGuarantee's fro about 6 hours now and it is still chugging along
and has not  failed.  I'm going to let it go overnight.  (I believe it used to fail within
an hour)  

What are thoughts on backporting this onto the 0.92 branch?   (as a separate issue..)
                
> TestAcidGuarantee broken on trunk 
> ----------------------------------
>
>                 Key: HBASE-2856
>                 URL: https://issues.apache.org/jira/browse/HBASE-2856
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.89.20100621
>            Reporter: ryan rawson
>            Assignee: Amitanand Aiyer
>            Priority: Blocker
>             Fix For: 0.94.0
>
>         Attachments: 2856-v2.txt, 2856-v3.txt, 2856-v4.txt, 2856-v5.txt, 2856-v6.txt,
2856-v7.txt, 2856-v8.txt, 2856-v9-all-inclusive.txt, acid.txt
>
>
> TestAcidGuarantee has a test whereby it attempts to read a number of columns from a row,
and every so often the first column of N is different, when it should be the same.  This is
a bug deep inside the scanner whereby the first peek() of a row is done at time T then the
rest of the read is done at T+1 after a flush, thus the memstoreTS data is lost, and previously
'uncommitted' data becomes committed and flushed to disk.
> One possible solution is to introduce the memstoreTS (or similarly equivalent value)
to the HFile thus allowing us to preserve read consistency past flushes.  Another solution
involves fixing the scanners so that peek() is not destructive (and thus might return different
things at different times alas).

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