Github user revans2 commented on the pull request:
https://github.com/apache/incubator-storm/pull/98#issuecomment-43210740
After ```_ (heartbeat-fn)``` the supervisor gives the worker 5 seconds, by
default, to heartbeat in again or it thinks it has died. If ZK is taking a
long time, which it can do under heavy load, the supervisor shoots the worker.
Without the call the supervisor gives the worker 120 seconds by default to
heartbeat in the first time.
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