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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6499) StoreScanner's QueryMatcher not reset on store update
Date Wed, 19 Dec 2012 23:29:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13536578#comment-13536578
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Sergey Shelukhin commented on HBASE-6499:
-----------------------------------------

woops, too late
                
> StoreScanner's QueryMatcher not reset on store update
> -----------------------------------------------------
>
>                 Key: HBASE-6499
>                 URL: https://issues.apache.org/jira/browse/HBASE-6499
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.96.0
>            Reporter: Max Lapan
>            Assignee: Max Lapan
>             Fix For: 0.96.0
>
>         Attachments: 6499-trunk-v2.txt, StoreScanner_not_reset_matcher.patch
>
>
> When underlying store changed (due compact, bulk load, etc), we destroy current KeyValueHeap
and recreate it using checkReseek call. Besides heap recreation, it resets underlying QueryMatcher
instance.
> The problem is that checkReseek not called by seek() and reseek(), only by next(). If
someone calls seek() just after store changed, it gets wrong scanner results. Call to reseek
may end up with NPE.
> AFAIK, current codebase don't call seek and reseek, but it is quite possible in future.
Personally, I spent lots of time to find source of wrong scanner results in HBASE-5416.

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