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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5121) MajorCompaction may affect scan's correctness
Date Wed, 11 Jan 2012 10:31:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183972#comment-13183972

Hudson commented on HBASE-5121:

Integrated in HBase-TRUNK #2617 (See [https://builds.apache.org/job/HBase-TRUNK/2617/])
    HBASE-5121 MajorCompaction may affect scan's correctness (chunhui shen and Lars H)

larsh : 
Files : 
* /hbase/trunk/CHANGES.txt
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/KeyValueHeap.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestScanner.java

> 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
>    Affects Versions: 0.90.4
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.94.0, 0.92.1
>         Attachments: 5121-0.92.txt, 5121-suggest.txt, 5121-trunk-combined.txt, 5121.90,
hbase-5121-testcase.patch, hbase-5121.patch, hbase-5121v2.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
> 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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