Github user lianhuiwang commented on the pull request:
https://github.com/apache/spark/pull/4051#issuecomment-71362007
@sryza @andrewor14 i find that setting minExecutors to initialExecutors is
best for the following situation: when DAGScheduler submits missing tasks of
first stage very lately because DAGScheduler need to scan large hdfs path in
order to get rdd's partitions. in my test, some jobs cost more than two minutes
on scanning hdfs. so in this situation, if we set a large number to
initialExecutors, before DAGScheduler submit missing tasks, these resources of
initialExecutors were wasted. if the time > executorIdleTimeout,
initialExecutors will be removed since they are executorIdleTimeout.
and we can reduce schedulerBacklogTimeout to make numExecutors reach to
maxExecutors quickly.
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