Total memory tracking: request for comments

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Total memory tracking: request for comments

Jose Soltren
https://issues.apache.org/jira/browse/SPARK-21157

Hi - often times, Spark applications are killed for overrunning available memory by YARN, Mesos, or the OS. In SPARK-21157, I propose a design for grabbing and reporting "total memory" usage for Spark executors - that is, memory usage as visible from the OS, including on-heap and off-heap memory used by Spark and third party libraries. This builds on many ideas from SPARK-9103.

I'd really welcome some review and some feedback of this design proposal. I think this could be a helpful feature for Spark users who are trying to triage memory usage issues. In the future I'd like to think about reporting memory usage from third party libraries like Netty, as was originally proposed in SPARK-9103.

Cheers,
--José
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