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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5121) MajorCompaction may affect scan's correctness
Date Wed, 04 Jan 2012 18:49:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179743#comment-13179743
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Todd Lipcon commented on HBASE-5121:
------------------------------------

No test for this? Can we get a functional test that can at least be run from the command line
to trigger it?

Nits: the javadoc on the constructors are unnecessary (they don't give any extra information)
Using the exception for control flow here looks dirty IMO.
                
> MajorCompaction may affect scan's correctness
> ---------------------------------------------
>
>                 Key: HBASE-5121
>                 URL: https://issues.apache.org/jira/browse/HBASE-5121
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: chunhui shen
>         Attachments: hbase-5121.patch
>
>
> In our test, there are two families' keyvalue for one row.
> But we could find a infrequent problem when doing scan's next if majorCompaction happens
concurrently.
> In the client's two continuous doing scan.next():
> 1.First time, scan's next returns the result where family A is null.
> 2.Second time, scan's next returns the result where family B is null.
> The two next()'s result have the same row.
> If there are more families, I think the scenario will be more strange...
> We find the reason is that storescanner.peek() is changed after majorCompaction if there
are delete type KeyValue.
> This change causes the PriorityQueue<KeyValueScanner> of RegionScanner's heap is
not sure to be sorted.

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