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https://issues.apache.org/jira/browse/SPARK-20161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951595#comment-15951595
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Apache Spark commented on SPARK-20161:
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User 'sahilTakiar' has created a pull request for this issue:
https://github.com/apache/spark/pull/17499
> Default log4j properties file should print thread-id in ConversionPattern
> -------------------------------------------------------------------------
>
> Key: SPARK-20161
> URL: https://issues.apache.org/jira/browse/SPARK-20161
> Project: Spark
> Issue Type: Improvement
> Components: Deploy, YARN
> Affects Versions: 2.1.0
> Reporter: Sahil Takiar
>
> The default log4j file in {{spark/conf/log4j.properties.template}} doesn't
> display the thread-id when printing out the logs. It would be very useful to
> add this, especially for YARN. Currently, logs from all the different threads
> in a single executor are sent to the same log file. This makes debugging
> difficult as it is hard to filter out what logs come from what thread.
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