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From "Kihwal Lee (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8149) cap space usage of default log4j rolling policy
Date Wed, 14 Mar 2012 13:52:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229198#comment-13229198
] 

Kihwal Lee commented on HADOOP-8149:
------------------------------------

I am fine with the default being RFA. But the latest patch still hardcodes the logger names
in hadoop-env.sh and hadoop-daemons.sh, which will unconditionally override custom env var.
They should set the logger to RFA only when HADOOP_*_LOGGER is not already set.  I am not
very concerned with the changes in log4j.properties, as it can be easily replaced by users,
but leaving the DRFA settings won't hurt either and make some people's life easier.
                
> 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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