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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8653) master seems to be deleting region tmp directory from under compaction
Date Thu, 30 May 2013 19:30:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670631#comment-13670631
] 

Hadoop QA commented on HBASE-8653:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12585412/8653-v2.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 hadoop1.0{color}.  The patch compiles against the hadoop 1.0 profile.

    {color:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/5887//console

This message is automatically generated.
                
> master seems to be deleting region tmp directory from under compaction
> ----------------------------------------------------------------------
>
>                 Key: HBASE-8653
>                 URL: https://issues.apache.org/jira/browse/HBASE-8653
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Blocker
>             Fix For: 0.95.1
>
>         Attachments: 8653-v2.txt, HBASE-8653-v0.patch
>
>
> Putting it in .1, feel free to move to .2.
> We have observed some compaction errors where the code was creating a new HDFS block,
and the file would not exist. Upon investigation, we found the .tmp directory delete request
on namenode from master IP shortly before that. There are no specific logs on master, but
one thing running at that time was CatalogJanitor. CatalogJanitor calls HRegionFileSystem::openRegionFromFileSystem
with readOnly == true (in fact, everyone does); if readOnly is true, HRegionFileSystem nukes
the .tmp directory.
> We didn't go thru details on how it arrived there (or if there may have been other culprit),
but it appears that deleting stuff if (readOnly) is not the intended behavior and it should
be if (!readOnly). Given that readOnly is not really used (or rather is always true except
some inconsequential usage in test) perhaps entire cleanup should be removed.

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