manuzhang opened a new pull request #27998: [SPARK-31219][YARN] Enable closeIdleConnections in YarnShuffleService URL: https://github.com/apache/spark/pull/27998 ### What changes were proposed in this pull request? Close idle connections at shuffle server side when an `IdleStateEvent` is triggered after `spark.shuffle.io.connectionTimeout` or `spark.network.timeout` time. ### Why are the changes needed? Idle connections to YarnShuffleService could never be closed, and will be accumulating and taking up memory and file descriptors. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? Existing tests.
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