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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2251) Avoid negative elapsed time in JHS/MRAM web UI and services
Date Fri, 04 Jul 2014 09:39:33 GMT

    [ https://issues.apache.org/jira/browse/YARN-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052303#comment-14052303
] 

Hadoop QA commented on YARN-2251:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12653860/MAPREDUCE-5940.2.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-yarn-project/hadoop-yarn/hadoop-yarn-common.

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

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/4202//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4202//console

This message is automatically generated.

> Avoid negative elapsed time in JHS/MRAM web UI and services
> -----------------------------------------------------------
>
>                 Key: YARN-2251
>                 URL: https://issues.apache.org/jira/browse/YARN-2251
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: MAPREDUCE-5940.1.patch, MAPREDUCE-5940.2.patch
>
>
> Recently we observed a rare bug that an elapsed time of a reducer is going to be negative
on JHS web UI and via REST APIs. While the real reason for this bug seems to be clock asynchronization
on different hosts, the web frontend should have masked the negative values. However, in the
current code, *org.apache.hadoop.mapreduce.v2.app.webapp.dao.** only check whether the elapsed
time is -1 or not.



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