Commits on May 1, 2017

1. SPARK-20540: Fix unstable executor requests. …

   There are two problems fixed in this commit. First, the
   ExecutorAllocationManager sets a timeout to avoid requesting executors
   too often. However, the timeout is always updated based on its value and
   a timeout, not the current time. If the call is delayed by locking for
   more than the ongoing scheduler timeout, the manager will request more
   executors on every run.
   
   The second problem is that the total number of requested executors is
   not tracked by the CoarseGrainedSchedulerBackend. Instead, it calculates
   the value based on the current status of 3 variables: the number of
   known executors, the number of executors that have been killed, and the
   number of pending executors. But, the number of pending executors is
   never less than 0, even though there may be more known than requested.
   When executors are killed and not replaced, this can cause the request
   sent to YARN to be incorrect because there were too many executors due
   to the scheduler's state being slightly out of date.

   

   rdblue committed May 1, 2017
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