Ngone51 opened a new pull request #31348:
URL: https://github.com/apache/spark/pull/31348
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### What changes were proposed in this pull request?
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Use `askSync` instead of `send` to sync the `ExecutorStateChanged` between
Worker and Master and retry(up to 10 times) on the failure until the message is
successfully handled by the Master. And the Worker would exit itself if the
message can not be sent after 10 times retry.
### Why are the changes needed?
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If the Worker fails to send ExecutorStateChanged to the Master due to some
unexpected errors, e.g., temporary network error, then the Master can't remove
the finished executor normally and think the executor is still alive. In the
worst case, if the executor is the only executor for the application, the
application can get hang.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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Pass existing tests.
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