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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 Thu, 02 Aug 2007 03:23:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517133
] 

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

+1

http://issues.apache.org/jira/secure/attachment/12363013/new-log-3.patch applied and successfully
tested against trunk revision r561975.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/506/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/506/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-2.patch, new-log-3.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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