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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8877) Reentrant row locks
Date Fri, 05 Jul 2013 16:55:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700996#comment-13700996
] 

Hadoop QA commented on HBASE-8877:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12591013/HBASE-8877.patch
  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 9 new or modified
tests.

    {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:red}-1 javadoc{color}.  The javadoc tool appears to have generated 2 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/6224//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/6224//console

This message is automatically generated.
                
> Reentrant row locks
> -------------------
>
>                 Key: HBASE-8877
>                 URL: https://issues.apache.org/jira/browse/HBASE-8877
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors, regionserver
>            Reporter: Dave Latham
>            Assignee: Dave Latham
>             Fix For: 0.95.2
>
>         Attachments: HBASE-8877.patch
>
>
> HBASE-8806 revealed performance problems with batch mutations failing to reacquire the
same row locks.  It looks like HBASE-8806 will use a less intrusive change for 0.94 to have
batch mutations track their own row locks and not attempt to reacquire them.  Another approach
will be to support reentrant row locks directly.  This allows simplifying a great deal of
calling code to no longer track and pass around lock ids.
> One affect this change will have is changing the RegionObserver coprocessor's methods
preBatchMutate and postBatchMutate from taking a {{MiniBatchOperationInProgress<Pair<Mutation,
Integer>> miniBatchOp}} to taking a {{MiniBatchOperationInProgress<Mutation> miniBatchOp}}.
 I don't believe CPs should be relying on these lock ids, but that's a potential incompatibility.

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