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From "Patrick Hunt (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8149) cap space usage of default log4j rolling policy
Date Wed, 14 Mar 2012 20:14:37 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Patrick Hunt updated HADOOP-8149:

    Status: Open  (was: Patch Available)

Sounds reasonable. Notice that in this patch DRFAS was renamed to RFAS and some of the appenders
(DRFAS/JSA/MRAUDIT/RMSUMMARY) are changed from DailyRolling to just Rolling. These are fine
or should some action be taken wrt backward compatibility?
> 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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