Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/12622#issuecomment-213795814
JVM addShutdownHook is being added for a couple for things and they have
logging, for example:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/ShutdownHookManager.scala
https://github.com/apache/spark/blob/af1f4da76268115c5a4cc3035d3236ad27f7240a/core/src/main/scala/org/apache/spark/SparkContext.scala#L559
But unfortunately they are not guaranteed to be called if the process is
terminated abruptly.
If we are concerned I think we should get a specific repro step to check if
we have logging for that case, if possible.
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