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https://issues.apache.org/jira/browse/SPARK-8981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623703#comment-14623703
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Sean Owen commented on SPARK-8981:
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I think it's OK if you can do this via the slf4j API and it doesn't add
overhead. I am not sure Logging is actually going to be removed; it's not to be
used by apps though. Logging can't use a SparkContext; it's not used where a
SparkContext is used, always. I don't think that's important. MDC has static
methods.
Are you proposing to change the default log message or just make these values
available? it might be less intrusive to not change the log output
> Set applicationId and appName in log4j MDC
> ------------------------------------------
>
> Key: SPARK-8981
> URL: https://issues.apache.org/jira/browse/SPARK-8981
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Reporter: Paweł Kopiczko
> Priority: Minor
>
> It would be nice to have, because it's good to have logs in one file when
> using log agents (like logentires) in standalone mode. Also allows
> configuring rolling file appender without a mess when multiple applications
> are running.
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