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https://issues.apache.org/jira/browse/MAPREDUCE-2372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated MAPREDUCE-2372:
-----------------------------------
Attachment: mapreduce-2372.txt
Here's a patch which allows the settings to come directly from system
properties.
Unfortunately, TLA isn't covered by any test cases yet, so nothing to change
there.
We will need a patch on Common to remove the settings from log4j.properties as
well.
> TaskLogAppender mechanism shouldn't be set in log4j.properties
> --------------------------------------------------------------
>
> Key: MAPREDUCE-2372
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2372
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Fix For: 0.22.0
>
> Attachments: mapreduce-2372.txt
>
>
> The TaskLogAppender log4j appender relies on using log4j.properties to pass
> in some Java system properties into properties of the logger. This is
> problematic since we've often found that users have customized
> log4j.properties and don't upgrade it when they upgrade the version of Hadoop.
> Since this is really an internal mechanism of how the task runner passes task
> info to the TLA, we shouldn't rely on these settings in log4j.properties at
> all. Rather, we should just get the system properties directly from
> System.getProperty.
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