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Date: Wed, 14 Aug 2013 22:25:49 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12662475.1375906050151.68184.1376519149405@arcas>
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References: <JIRA.12662475.1375906050151@arcas>
Subject: [jira] [Commented] (HDFS-5076) Add MXBean methods to query NN's
 transaction information and JournalNode's journal status
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    [ https://issues.apache.org/jira/browse/HDFS-5076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13740297#comment-13740297 ] 

Hadoop QA commented on HDFS-5076:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12598048/HDFS-5076.004.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 2 new or modified test files.

    {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:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {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 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/4822//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4822//console

This message is automatically generated.
                
> Add MXBean methods to query NN's transaction information and JournalNode's journal status
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-5076
>                 URL: https://issues.apache.org/jira/browse/HDFS-5076
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 3.0.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>            Priority: Minor
>         Attachments: HDFS-5076.001.patch, HDFS-5076.002.patch, HDFS-5076.003.patch, HDFS-5076.004.patch
>
>
> Currently NameNode already provides RPC calls to get its last applied transaction ID and most recent checkpoint's transaction ID. It can be helpful to provide support to enable querying these information through JMX, so that administrators and applications like Ambari can easily decide if a forced checkpoint by calling saveNamespace is necessary. Similarly we can add MxBean interface for JournalNodes to query the status of journals (e.g., whether journals are formatted or not).

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