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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1553) Extensive logging of C++ application can slow down task by an order of magnitude
Date Wed, 01 Aug 2007 06:36:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12516880
] 

Hadoop QA commented on HADOOP-1553:
-----------------------------------

+0, new Findbugs warnings

http://issues.apache.org/jira/secure/attachment/12362939/new-log.patch
applied and successfully tested against trunk revision r561603,
but there appear to be new Findbugs warnings introduced by this patch.

New Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/496/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/496/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/496/console

> Extensive logging of C++ application can slow down task by an order of magnitude
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-1553
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1553
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.13.0
>            Reporter: Christian Kunz
>            Assignee: Owen O'Malley
>            Priority: Blocker
>             Fix For: 0.14.0
>
>         Attachments: new-log.patch
>
>
> We observed that extensive logging (due to some configuration mistake) of a c++ application
using the pipes interface can slow down the task by an order of magnitude. During that time
disk usage was not high, with no abnormal memory usage, and basically idle CPU.

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