Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/4012#issuecomment-71913947
I agree with Patrick -- it's a very case-by-case basis, but we decided not
to document these:
- spark.shuffle.io.mode: We could not see a difference between NIO and
EPOLL from a performance perspective, and EPOLL is less stable, so we did not
want to suggest to use it.
- spark.shuffle.io.backLog: This is more suitable for a serving layer than
a shuffle layer, I can't think why someone would want to specify this.
spark.shuffle.io.receiveBuffer/sendBuffer: These are very low-level tuning
parameters that are likely not to achieve a noticeable performance benefit, so
documenting them might just lead people to think they're more important than
they are.
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