Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/16503
Good catch. Looks good to me.
@vanzin The RPC layer only guarantees at-most-once. Retry may be still
helpful in some case, but the receiver should be idempotent. Either the current
change or changing to use `ask` (Spark will retry the task) is good to me.
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