Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/16790
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GitHub user jinxing64 opened a pull request:
https://github.com/apache/spark/pull/16790
[SPARK-19450] Replace askWithRetry with askSync.
## What changes were proposed in this pull request?
`askSync` is already added in `RpcEndpointRef` (see SPARK-19347 and
https://github.co
