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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6149) Document override log4j.properties in MR job
Date Mon, 15 Dec 2014 18:19:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14246949#comment-14246949
] 

Junping Du commented on MAPREDUCE-6149:
---------------------------------------

Thanks [~qwertymaniac] for review and comments! Address most of comments in v2 patch.
bq. The statement container-log4j.properties under $HADOOP_CONF_DIR on each node is a bit
misleading, since the file is typically from within the jar (hadoop-yarn-server-nodemanger.jar)
and not usually on the service $HADOOP_CONF_DIR paths.
That's true. Sorry for mistake here. Remove the misleading part. 

bq.  What impact does this have, if any, over the use of mapreduce.map/reduce.log.level?
The config set in "mapreduce.map/reduce.log.level" could be overridden by log4j.properties
specified here. Already add the mention to related two configuration in v2 patch.

bq. Are any standard logger names/configs required to be present, such that all of our framework-side
logging ends up finding a valid appender.
Not too much idea in my mind even after checking container-log4j.properties. Any suggestions
here?

> Document override log4j.properties in MR job
> --------------------------------------------
>
>                 Key: MAPREDUCE-6149
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6149
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: MAPREDUCE-6149-v2.patch, MAPREDUCE-6149.patch
>
>
> This new feature comes from MAPREDUCE-6052, some documentation requirements from Vinod
below:
>     Document the new config in mapred-default.xml
>     Mention in that documentation that if no-scheme is given in the path, it defaults
to a log4j file on the local FS.
>     Modify the documentation of log-level configs to say that if you override to have
your own log4j.properties file, the log-level configs may not work.



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