manuzhang opened a new pull request #27998: [SPARK-31219][YARN] Enable 
closeIdleConnections in YarnShuffleService
   ### What changes were proposed in this pull request?
   Close idle connections at shuffle server side when an `IdleStateEvent` is 
triggered after `` or `` 
   ### 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?
   ### How was this patch tested?
   Existing tests.

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