Github user ajithme commented on the issue:
https://github.com/apache/spark/pull/22120
@vanzin I agree its a trivial change. Just wanted it to be consistent
output with yarn cluster mode. This is not just for event logs also for a
custom SparkListener , it may be confusing that appId is empty in client case
and a actual number in cluster case for onApplicationStart, this is where its
effect can be seen.
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