Josh Rosen resolved SPARK-2539.
    Resolution: Won't Fix

Resolving as "won't fix" since the ConnectionManager has been removed in Spark 
1.6.x and 2.x.

> ConnectionManager should handle Uncaught Exception
> --------------------------------------------------
>                 Key: SPARK-2539
>                 URL: https://issues.apache.org/jira/browse/SPARK-2539
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>            Reporter: Kousuke Saruta
> ConnectionManager uses ThreadPool and worker threads run on spawned thread in 
> ThreadPool.
> In current implementation, some uncaught exception thrown from the thread, 
> nobody handle that.
> If the Exception is fatal, it should be handled and executor should exit.

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