Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/3393#issuecomment-63904354
At launching from spark-submit with mesos master, for the first time,
resourceOffers are called, there's no task at that time because taskScheduler
didn't submit a job. Thus all offers are declined because no tasks. In
branch-1.1, d.launchTasks with empty tasks declined implicitly, but in current
master, If offers don't have any tasks, d.launchTasks are not called. Thus
unused offers from acceptedOffers are not declined. I fix that situation and
edited test case
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