Github user kayousterhout commented on the pull request:
https://github.com/apache/spark/pull/2968#issuecomment-61938133
@sryza this mostly looks good and super helpful!! One more comment I
discussed with @pwendell: I think it would be good to add an output type field
to output metrics (similar to what we have for input metrics) that currently
can only be Hadoop. The motivation for this is that there's some annoying
overhead associated with changing stuff we write out to Json, and it seems like
we're likely to want to add metrics for other output types (e.g., storing
output data in the block manager) later on.
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