[SPARK-9103][WIP] Track Netty memory usage - take two #17762
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This patch resurrects #7753 by liyezhang556520 and #17625 by jsoltren.
What changes were proposed in this pull request?
Memory reporting is a much desired feature in Apache Spark. This change adds reporting for some memory used by netty. We introduce a new executorMetrics object to track this.
This is a backend only change. No UI is included with this change.
How was this patch tested?
Ran https://github.com/jsoltren/spark-demos/blob/master/src/main/scala/org/soltren/spark/examples/ShuffleGroupCount.scala