igreenfield commented on pull request #26624:
URL: https://github.com/apache/spark/pull/26624#issuecomment-621590368
we are running one-app but submit to it many tasks using spark-server so it
has many tasks that belong to different requests. so in our case, we mostly use
the `mdc.` local property. to add info into logs.
and from the original Jira:
> 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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