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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5121) MajorCompaction may affect scan's correctness
Date Thu, 05 Jan 2012 10:59:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180280#comment-13180280
] 

Hadoop QA commented on HBASE-5121:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12509522/hbase-5121-testcase.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 javadoc.  The javadoc tool appears to have generated -151 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 79 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

     -1 core tests.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.regionserver.TestScanner

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/672//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/672//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/672//console

This message is automatically generated.
                
> 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
>            Assignee: chunhui shen
>         Attachments: 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
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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