[jira] [Commented] (MAPREDUCE-3408) yarn-daemon.sh unconditionnaly sets yarn.root.logger

["Bruno Mahé (Commented JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151835#comment-13151835 ] 

Bruno Mahé commented on MAPREDUCE-3408:
---------------------------------------

IMHO option 2/ is the safest and most conservative approach.
I will prepare a patch tomorrow.
Please let me know if you think of a better way.
                
> yarn-daemon.sh unconditionnaly sets yarn.root.logger
> ----------------------------------------------------
>
>                 Key: MAPREDUCE-3408
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3408
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, nodemanager, resourcemanager
>    Affects Versions: 0.23.0, 0.23.1
>            Reporter: Bruno Mahé
>            Assignee: Bruno Mahé
>              Labels: bigtop
>
> yarn-daemon.sh unconditionnaly sets yarn.root.logger which then prevent any override from happening.
> From ./hadoop-mapreduce-project/hadoop-yarn/bin/yarn-daemon.sh:
> > export YARN_ROOT_LOGGER="INFO,DRFA"
> > export YARN_JHS_LOGGER="INFO,JSA"
> and then yarn-daemon.sh will call "$YARN_HOME"/bin/yarn which does the following:
> > YARN_OPTS="$YARN_OPTS -Dhadoop.root.logger=${YARN_ROOT_LOGGER:-INFO,console}"
> > YARN_OPTS="$YARN_OPTS -Dyarn.root.logger=${YARN_ROOT_LOGGER:-INFO,console}"
> This has at least 2 issues:
> * I cannot override hadoop.root.logger when using the yarn-daemon.sh script
> * I cannot have different values for hadoop.root.logger and yarn.root.logger
> I currently see two different ways to proceed forward:
> 1/ Make the script yarn-daemon.sh only sets a default value for YARN_ROOT_LOGGER if this variable is not defined
> 2/ Remove the quoted code from yarn-daemon.sh since yarn already does something similar
> 3/ Entirely remove that chunk and let people define their logging however they want through some properties files (see log4j.properties in the conf directories for instance)
> I would also use the variable HADOOP_ROOT_LOGGER for hadoop.root.logger if either option 1/ or 2/ would be taken.
> I don't really have any preference toward any of these solutions. What would you recommend? What is the Apache Hadoop way for this matter?
> Note: This is probably happening as well for the other daemons, and I will take a look at it once this issue is resolved.

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