tianlzhang dad61ed465 [SPARK-31646][SHUFFLE] Remove unused registeredConnections counter from ShuffleMetrics ... ### What changes were proposed in this pull request? Remove unused `registeredConnections` counter from `ExternalBlockHandler#ShuffleMetrics` This was added by SPARK-25642 at 3.0.0 - 8dd29fe36b ### Why are the changes needed? It's `registeredConnections` counter created in `TransportContext` that's really counting the numbers and it's misleading for people who want to add new metrics like `registeredConnections`. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Add UTs to ensure all expected metrics are registered for `ExternalShuffleService` and `YarnShuffleService` Closes #28457 from manuzhang/spark-31611-pre. Lead-authored-by: tianlzhang <tianlzhang@ebay.com> Co-authored-by: Dongjoon Hyun <dongjoon@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>		2020-05-07 15:22:13 -07:00
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src	[SPARK-31646][SHUFFLE] Remove unused registeredConnections counter from ShuffleMetrics	2020-05-07 15:22:13 -07:00
pom.xml	[SPARK-30950][BUILD] Setting version to 3.1.0-SNAPSHOT	2020-02-25 19:44:31 -08:00