pan3793 commented on PR #52091:
URL: https://github.com/apache/spark/pull/52091#issuecomment-3223609798
> What's the behavior for cluster mode?
@yaooqinn In YARN cluster mode, the AM always sends a kill signal to
terminate the Driver JVM after main exited; there is no behavior change from
the user's perspective, regardless of whether
`spark.submit.callSystemExitOnMainExit` is on or off.
In K8s cluster mode, after the main method exits, `SparkContext` is stopped,
1. if there are daemon threads in driver JVM process
1.1. JVM process will hang without this patch, or
`spark.submit.callSystemExitOnMainExit` is false
1.2. JVM process will exit when `spark.submit.callSystemExitOnMainExit` is
true
2. if there are no daemon threads in driver JVM process, the JVM process
will exit
In summary, from the user's perspective, this functionality helps K8s
cluster mode for jobs that have daemon threads in driver - they can enable
`spark.submit.callSystemExitOnMainExit` to avoid driver Pod hang after Spark
job finishes.
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