Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3794#issuecomment-111743100
FYI, this is on my list of old PRs / issues to revisit in the medium-term.
I'm also considering adding some instrumentation to DAGScheduler to make this
type of blocking / slowdown easier to discover; see
https://issues.apache.org/jira/browse/SPARK-8344
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