Github user ksakellis commented on the pull request:
https://github.com/apache/spark/pull/4067#issuecomment-70301522
A big motivation to add recordsRead/Written was to detect data skew. In
these cases bytes and records might not track very closely.
Thinking more about this, I suspect that having an Avg. record Size column
(bytesRead/recordsRead) would be what you'd want to sort on. We could add this
metric to the UI, make it sortable and then combine the bytesRead and
recordsRead metrics into one column. Thoughts?
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