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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8149) cap space usage of default log4j rolling policy
Date Fri, 09 Mar 2012 00:19:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225706#comment-13225706
] 

Eli Collins commented on HADOOP-8149:
-------------------------------------

Kihwal,

Good point. Given that the 23.x releases are currently alpha/beta, introduce new daemons and
logs, etc, isn't this a good time for people to update?  People can update their log4j.properties
and env variables if they'd like to stay on the current behavior, no code changes should be
required.

Thanks,
Eli
                
> cap space usage of default log4j rolling policy 
> ------------------------------------------------
>
>                 Key: HADOOP-8149
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8149
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>            Reporter: Patrick Hunt
>            Assignee: Patrick Hunt
>         Attachments: HADOOP-8149.patch, HADOOP-8149.patch
>
>
> I've seen several critical production issues because logs are not automatically removed
after some time and accumulate. Changes to Hadoop's default log4j file appender would help
with this.
> I recommend we move to an appender which:
> 1) caps the max file size (configurable)
> 2) caps the max number of files to keep (configurable)
> 3) uses rolling file appender rather than DRFA, see the warning here:
> http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/DailyRollingFileAppender.html
> Specifically: "DailyRollingFileAppender has been observed to exhibit synchronization
issues and data loss."
> We'd lose (based on the default log4j configuration) the daily rolling aspect, however
increase reliability.

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