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From "Amitanand Aiyer (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-2856) TestAcidGuarantee broken on trunk
Date Fri, 18 Nov 2011 02:01:52 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Amitanand Aiyer updated HBASE-2856:

    Attachment: 2856-v9-all-inclusive.txt

2856-v9-all-inclusive includes all the 4 patches for the sub tasks
(i) persist memstorTS to disk
(ii) 4485
(iii) track versions corrrectly
(iv) rename RWCC to MVCC.

This is rebased to the latest trunk HEAD. trunk@1203428

Ran the unit tests on mr. and they seem to pass except TestShell (which seems to fail even
without these patches).
> 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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