Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/8931#issuecomment-146285580
I think we want to have concise and consistent names here across all the
metrics. Here is my proposal for naming:
```
input rows
output rows
spilled data
memory
task memory (max)
task spilled data (max)
```
I think the word "peak" is not necessary because I assume your report the
peak memory over the lifetime of a task. I think the word "total" is not
necessary because these are accumulated values and can be assumed to be total
unless otherwise stated.
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