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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10319) HLog should roll periodically to allow DN decommission to eventually complete.
Date Mon, 03 Feb 2014 22:07:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889976#comment-13889976
] 

Hadoop QA commented on HBASE-10319:
-----------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12626734/HBASE-10319-v1.patch
  against trunk revision .
  ATTACHMENT ID: 12626734

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

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
tests.

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

    {color:green}+1 hadoop1.1{color}.  The patch compiles against the hadoop 1.1 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/8580//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/8580//console

This message is automatically generated.

> HLog should roll periodically to allow DN decommission to eventually complete.
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-10319
>                 URL: https://issues.apache.org/jira/browse/HBASE-10319
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jonathan Hsieh
>            Assignee: Matteo Bertozzi
>         Attachments: HBASE-10319-v0.patch, HBASE-10319-v1.patch
>
>
> We encountered a situation where we had an esseitially read only table and attempted
to do a clean HDFS DN decommission.  DN's cannot decomission if there are open blocks being
written to currently on it.  Because the hbase Hlog file was open, had some data (hlog header),
the DN could not decommission itself.  Since no new data is ever written, the existing periodic
check is not activated.
> After discussing with [~atm], it seems that although an hdfs semantics change would be
ideal (e.g. hbase doesn't have to be aware of hdfs decommission and the client would roll
over) this would take much more effort than having hbase periodically force a log roll.  This
would enable the hdfs dn con complete.



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