Github user susanxhuynh commented on the issue:
https://github.com/apache/spark/pull/18674
@skonto There is not much changed in the dispatcher. The main difference is
in the executors.
First of all, if the user does not set this new config, it will default to
the old behavior (failover_timeout=0), and everything remains the same. If the
driver is temporarily disconnected from the Mesos master, the master tears down
the framework immediately, killing all the executors.
If the user sets the new failover_timeout > 0, then if the driver becomes
disconnected from the master, the master will wait failover_timeout seconds. It
will not kill any executors during this time. If the driver reconnects within
the timeout period, then the job continues running uninterrupted.
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