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https://issues.apache.org/jira/browse/YARN-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052300#comment-14052300
 ] 

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/4201//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4201//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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