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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9949) Fix the race condition between Compaction and StoreScanner.init
Date Tue, 19 Nov 2013 03:57:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13826162#comment-13826162
] 

Jonathan Hsieh commented on HBASE-9949:
---------------------------------------

Hey [~tedyu@apache.org] commented on Friday or Thursday that I'm concerned about this infrastructure
creeping in throughout the code.  Specifically the in the main comment i mentioned that "This
was not addressed" and then you committed without addressing the concern I had with the code
in the review and there were no +1's in review board.   (Though sergey had a conditional +1
in jira).

I'm assuming this was a an oversight.

To be clear, I'm basically fine with the fix -- I'm mostly concerned about the new framework.

It seems like yet another infrastructure and it is one that I'm not particularly fond of because
of it seems cumbersome and has the potential to perf impact in other areas if extended. This
will take more work but it can be done in a way that makes the code more readable and maintainable
and I'd rather we move in that direction instead of adding yet more one of infrastructures.
 Can we instead make use a factories patterns + mocks to do this injection?  Happy to move
this discussion to the mailing list.  


> Fix the race condition between Compaction and StoreScanner.init
> ---------------------------------------------------------------
>
>                 Key: HBASE-9949
>                 URL: https://issues.apache.org/jira/browse/HBASE-9949
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>    Affects Versions: 0.89-fb
>            Reporter: Manukranth Kolloju
>            Assignee: Manukranth Kolloju
>            Priority: Minor
>             Fix For: 0.89-fb, 0.98.0
>
>         Attachments: 9949-0.96.addendum, 9949-trunk-v1.txt, 9949-trunk-v2.txt, 9949-trunk-v3.txt
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> The StoreScanner constructor has multiple stages and there can be a race betwwen an ongoing
compaction and the StoreScanner constructor where we might get the list of scanners before
a compaction and seek on those scanners after the compaction.



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