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From "Eli Collins (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8149) cap space usage of default log4j rolling policy
Date Fri, 09 Mar 2012 20:30:57 GMT

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

Eli Collins updated HADOOP-8149:
--------------------------------

    Release Note: Hadoop log files are now rolled by size instead of date (daily) by default.
Tools that depend on the log file name format will need to be updated. Users who would like
to maintain the previous settings can use their current log4j.properties files and update
the   HADOOP_ROOT_LOGGER and HADOOP_SECURITY_LOGGER environment variables to use DRFA and
DRFAS respectively.
    Hadoop Flags: Incompatible change,Reviewed

+1 to the latest patch. I've updated the release notes field with information on how to configure
the old behavior for users who don't want to switch.
                
> 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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