vanzin opened a new pull request #24160: [SPARK-27219][core] Treat timeouts as fatal in SASL fallback path. URL: https://github.com/apache/spark/pull/24160 When a timeout happens we don't know what's the state of the remote end, so there is no point in doing anything else since it will most probably fail anyway. The change also demotes the log message printed when falling back to SASL, since a warning is too noisy for when the fallback is really needed (e.g. old shuffle service, or shuffle service with new auth disabled).
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