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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5940) Avoid negative elapsed time in JHS/MRAM web UI and services
Date Thu, 03 Jul 2014 11:31:30 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14051345#comment-14051345
] 

Junping Du commented on MAPREDUCE-5940:
---------------------------------------

bq. Silently making the elapsed time as 0 when it is negative may lead to hiding the bugs
related to elapsed time. Adding a warning/info message before making it as 0 would help to
diagnose/find out the issues if any.
Agree. I have similar comments above.

> 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
>
>
> 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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