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From "Hudson (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 15:16:36 GMT

    [ https://issues.apache.org/jira/browse/YARN-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052503#comment-14052503
] 

Hudson commented on YARN-2251:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1821 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1821/])
YARN-2251. Avoid negative elapsed time in JHS/MRAM web UI and services (Contributed by Zhijie
Shen) (junping_du: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1607833)
* /hadoop/common/trunk/hadoop-yarn-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/Times.java
* /hadoop/common/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestTimes.java


> 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
>             Fix For: 2.6.0
>
>         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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