[jira] [Commented] (SPARK-16784) Configurable log4j settings

["Torsten Scholak (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-16784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960922#comment-15960922 ] 

Torsten Scholak commented on SPARK-16784:
-----------------------------------------

I having this exact problem. I need to be able to change the log settings depending on the job and/or the application. The method illustrated above, i.e. specifying

spark.driver.extraJavaOptions=-Dlog4j.configuration=log4j.properties,
spark.executor.extraJavaOptions=-Dlog4j.configuration=log4j.properties

using spark-submit with "--files log4j.properties" does indeed NOT work.
However, I was surprised to find it suggested as solution on stackoverflow (http://stackoverflow.com/questions/28454080/how-to-log-using-log4j-to-local-file-system-inside-a-spark-application-that-runs), since it is in direct contradiction to issue described in this ticket.

[~jbacon] have you created a follow-up ticket?

> Configurable log4j settings
> ---------------------------
>
>                 Key: SPARK-16784
>                 URL: https://issues.apache.org/jira/browse/SPARK-16784
>             Project: Spark
>          Issue Type: Improvement
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Michael Gummelt
>
> I often want to change the logging configuration on a single spark job.  This is easy in client mode.  I just modify log4j.properties.  It's difficult in cluster mode, because I need to modify the log4j.properties in the distribution in which the driver runs.  I'd like a way of setting this dynamically, such as a java system property.  Some brief searching showed that log4j doesn't seem to accept such a property, but I'd like to open up this idea for further comment.  Maybe we can find a solution.



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