[SPARK-21934] Expose Netty memory usage via Metrics System - ASF JIRA

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Details

Type: Sub-task
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 2.3.0
Fix Version/s: 2.3.0
Component/s: Spark Core
Labels:
None

Description

This is a follow-up work of ~~SPARK-9104~~ to expose the Netty memory usage to MetricsSystem. My initial thought is to only expose Shuffle memory usage, since shuffle is a major part of memory usage in network communication compared to RPC, file server, block transfer.

If user wants to also expose Netty memory usage for other modules, we could add more metrics later.