Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/1313#issuecomment-50299464
Ah, yes, you're right, working on this...
the only issue is that PROCESS_LOCAL is also NODE_LOCAL and myLocalities is
not updated upon the completion of each task.... so might not be easy to
distinguish if there are some "only NODE_LOCAL" tasks worthing waiting for 3
seconds when we call with NO_PREFS,
e.g.
case 1: T1 (PROCESS_LOCAL & NODE_LOCAL), T2 (PROCESS_LOCAL & NODE_LOCAL),
T3(NO_PREFS)
case 2: T1 (PROCESS_LOCAL& NODE_LOCAL), T2(PROCESS_LOCAL& NODE_LOCAL),
T3(NODE_LOCAL), T4(NO_PREFS)
in case 2, we might need to wait for delay duration when calling with
NO_PREFS to prevent T4 being scheduled before T3....
in case 1, we don't need to do that, since all NODE_LOCALS have actually
been scheduled
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