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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12424) Finer grained logging and metrics for split transactions
Date Fri, 07 Nov 2014 03:37:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14201531#comment-14201531
] 

Hadoop QA commented on HBASE-12424:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12680046/HBASE-12424.patch
  against trunk revision .
  ATTACHMENT ID: 12680046

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

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

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

                {color:red}-1 checkstyle{color}.  The applied patch generated 3784 checkstyle
errors (more than the trunk's current 3782 errors).

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) 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/11611//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Checkstyle Errors: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//artifact/patchprocess/checkstyle-aggregate.html

                Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/11611//console

This message is automatically generated.

> Finer grained logging and metrics for split transactions
> --------------------------------------------------------
>
>                 Key: HBASE-12424
>                 URL: https://issues.apache.org/jira/browse/HBASE-12424
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 2.0.0, 0.98.8, 0.99.2
>
>         Attachments: 0001-HBASE-12424-Finer-grained-logging-and-metrics-for-sp.patch,
0002-HBASE-12424-Finer-grained-logging-and-metrics-for-sp.patch, 0003-HBASE-12424-Finer-grained-logging-and-metrics-for-sp.patch,
HBASE-12424-0.98.patch, HBASE-12424.patch, HBASE-12424.patch, HBASE-12424.patch, HowHBaseRegionSplitsareImplemented.pdf
>
>
> A split transaction is a complex orchestration of activity between the RegionServer,
Master, ZooKeeper, and HDFS NameNode. We have some visibility into the time taken by various
phases of the split transaction in the logs. We will see "Starting split of region $PARENT"
before the transaction begins, before the parent is offlined. Later we will see "Opening $DAUGHTER"
as one of the last steps in the transaction, this is after the parent has been flushed, offlined,
and closed. Finally ""Region split, hbase:meta updated, and report to master ... Split took
$TIME" after all steps are complete and including the total running time of the transaction.

> For debugging the cause(s) of long running split transactions it would be useful to know
the distribution of time spent in all of the phases of the split transaction. 



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