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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