Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/3142#issuecomment-62105563
The current behavior would crash the second worker. We could disable this
behavior and revert to logging if SPARK_WORKER_INSTANCES is set and > 1, but I
would be hesitant to just always catch errors from starting the server, as it
would just continuously produce failing executors.
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