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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5693) Few NN metrics data points were collected via JMX when NN is under heavy load
Date Tue, 08 Apr 2014 05:12:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13962590#comment-13962590
] 

Hadoop QA commented on HDFS-5693:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12639123/HDFS-5693.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 1 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}.  There were no new javadoc 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/6613//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6613//console

This message is automatically generated.

> Few NN metrics data points were collected via JMX when NN is under heavy load
> -----------------------------------------------------------------------------
>
>                 Key: HDFS-5693
>                 URL: https://issues.apache.org/jira/browse/HDFS-5693
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Ming Ma
>         Attachments: HADOOP-5693.patch, HDFS-5693.patch
>
>
> JMX sometimes doesn’t return any value when NN is under heavy load. However, that is
when we would like to get metrics to help to diagnosis the issue.
> When NN is under heavy load due to bad application or other reasons, it holds FSNamesystem's
writer lock for a long period of time. Many of the FSNamesystem metrics require FSNamesystem's
reader lock and thus can't be processed.
> This is a special case to improve the overall NN concurrency.



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