Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/4055#issuecomment-71457733
@cloud-fan
According current code, it may not easy to change to not re-submit task in
pendingTasks. To be honest, current DAGScheduler is complicated but at some
point, is simple for some situation, still a lot may need to be improved.
re-submit occurs have failed-stage and due to a fetch failed. a
fetch-failed means current running TaskSet is dead(called `zombie`), so it just
have the already scheduled on Executor task are running, others in
stage.pendingTask will never be scheduled in previous taskset. but it can do to
just resubmit not scheduled tasks.
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