Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/18124
I'm not sure how this could be happened, "SPARK_YARN_STAGING_DIR" is a
Spark internal environment variable which should be empty, unless you
deliberately unset it.
In the JIRA you mentioned you directly running `ApplicationMaster`, so that
you met this issue, I'm not sure why you need to directly call
`ApplicationMaster`?
BTW seems you submitted a PR against branch 2.1, why not against master
branch?
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