Github user darabos commented on the pull request:
https://github.com/apache/spark/pull/1329#issuecomment-48373710
> LGTM. Regarding the initial problem you observed, did you see the actual
exception via the DAGScheduler's OneForOneStrategy failure? Or were there no
log messages containing the error?
Yes, the exception was logged from OneForOneStrategy. See the stack trace
in https://issues.apache.org/jira/browse/SPARK-2403. (Well, except I omitted
the first line which names OneForOneStrategy. Sorry about that.)
But after logging that, the system stalled. `localhost:4040` was refusing
connections and `jstack` showed just a number of waiting threads. (I've left
work now, but I can paste more details tomorrow if you're interested.)
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