[SPARK-21456][MESOS] Make the driver failover_timeout configurable#18674

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susanxhuynh wants to merge 2 commits intoapache:masterfrom

d2iq-archive:sh-mesos-failover-timeout

Commits on Jul 18, 2017

Made the driver failover_timeout configurable as spark.mesos.driver.failoverTimeout. Added a unit test.
susanxhuynh
committed

Commits on Jul 19, 2017

Addressed review comments: (1) explain default value of zero, (2) use the config key.
susanxhuynh
committed