Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1227#issuecomment-145812243
I think it makes a difference if the JVM is killed with SIGTERM or SIGKILL.
In the former case, the shutdown hooks will be executed. I might be that Yarn
first sends a SIGTERM signal before SIGKILL in case of a JVM termination which
is not intended. But maybe @rmetzger can chime in here.
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