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[SPARK-9497] [SPARK-9509] [CORE] Use ask instead of askWithRetry
`RpcEndpointRef.askWithRetry` throws `SparkException` rather than `TimeoutException`. Use ask to replace it because we don't need to retry here. Author: zsxwing <zsxwing@gmail.com> Closes apache#7824 from zsxwing/SPARK-9497 and squashes the following commits: 7bfc2b4 [zsxwing] Use ask instead of askWithRetry
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