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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 17:17:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517018
] 

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

-1, build or testing failed

2 attempts failed to build and test the latest attachment http://issues.apache.org/jira/secure/attachment/12362983/new-log-2.patch
against trunk revision r561603.

Test results:   http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/500/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/500/console

Please note that this message is automatically generated and may represent a problem with
the automation system and not the patch.

> 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
>
>
> 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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