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Date: Wed, 14 Mar 2012 20:14:37 +0000 (UTC)
From: "Patrick Hunt (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (HADOOP-8149) cap space usage of default log4j
 rolling policy
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     [ 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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