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https://issues.apache.org/jira/browse/MAPREDUCE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052135#comment-14052135
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Hadoop QA commented on MAPREDUCE-5940:
--------------------------------------
{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-MAPREDUCE-Build/4712//testReport/
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4712//console
This message is automatically generated.
> Avoid negative elapsed time in JHS/MRAM web UI and services
> -----------------------------------------------------------
>
> Key: MAPREDUCE-5940
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5940
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobhistoryserver, mr-am, webapps
> 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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