Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/1313#issuecomment-51098059
In the current version (no delay for nopref tasks at all)
yes, we check node-local tasks prior to no-pref tasks, if none, we can
launch no-pref immediately, don't need to wait for any locality-wait duration
(in most of cases)
yes, for the disadvantage, it's within the same job,
e.g. when there are some process-local tasks, node-local tasks, and nopref
tasks, node-local ones may not be able to run before due to the delay
scheduling, but it will go forward to check nopref tasks, then we break the
rule that nodeLocal is always prior to nopref
Fine granularity tracking can resolve the disadvantage above....
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