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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7403) Online Merge
Date Sat, 16 Mar 2013 05:44:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604126#comment-13604126

Hadoop QA commented on HBASE-7403:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

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

    {color:green}+1 tests included{color}.  The patch appears to include 15 new or modified

    {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:red}-1 lineLengths{color}.  The patch introduces lines longer than 100

    {color:red}-1 site{color}.  The patch appears to cause mvn site goal to fail.

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

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/4846//console

This message is automatically generated.
> Online Merge
> ------------
>                 Key: HBASE-7403
>                 URL: https://issues.apache.org/jira/browse/HBASE-7403
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.95.0
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.95.0, 0.98.0
>         Attachments: 7403-trunkv5.patch, 7403-trunkv6.patch, 7403v5.diff, 7403-v5.txt,
7403v5.txt, hbase-7403-94v1.patch, hbase-7403-trunkv10.patch, hbase-7403-trunkv11.patch, hbase-7403-trunkv12.patch,
hbase-7403-trunkv13.patch, hbase-7403-trunkv14.patch, hbase-7403-trunkv15.patch, hbase-7403-trunkv16.patch,
hbase-7403-trunkv19.patch, hbase-7403-trunkv1.patch, hbase-7403-trunkv20.patch, hbase-7403-trunkv22.patch,
hbase-7403-trunkv23.patch, hbase-7403-trunkv5.patch, hbase-7403-trunkv6.patch, hbase-7403-trunkv7.patch,
hbase-7403-trunkv8.patch, hbase-7403-trunkv9.patch, merge region.pdf
> Support executing region merge transaction on Regionserver, similar with split transaction
> Process of merging two regions:
> a.client send RPC(dispacth merging regions) to master
> b.master move the regions together (on the same regionserver)
> c.master send RPC(merge regions) to regionserver
> d.Regionserver execute the regions merge transaction in the thread pool
> e.the above b,c,d run asynchronously
> Process of region merge transaction:
> a.Construct a new region merge transaction.
> b.prepare for the merge transaction, the transaction will be canceled if it is unavailable,

> e.g. two regions don't belong to same table; two regions are not adjacent in a non-compulsory
merge; region is closed or has reference
> c.execute the transaction as the following:
>     /**
>      * Set region as in transition, set it into MERGING state.
>      */
>     /**
>      * We created the temporary merge data directory.
>      */
>     /**
>      * Closed the merging region A.
>      */
>     /**
>      * The merging region A has been taken out of the server's online regions list.
>      */
>     /**
>      * Closed the merging region B.
>      */
>     /**
>      * The merging region B has been taken out of the server's online regions list.
>      */
>     /**
>      * Started in on creation of the merged region.
>      */
>     /**
>      * Point of no return. If we got here, then transaction is not recoverable
>      * other than by crashing out the regionserver.
>      */
>     PONR
> d.roll back if step c throws exception
> Usage:
> HBaseAdmin#mergeRegions
> See more details from the patch

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