Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/2519#issuecomment-66710155
Agreed that there's probably not a ton that's immediately tunable. But
someone looking to "make it faster" could read this section, realize that they
have bad locality, and move their HDFS and Spark workers closer together as a
result.
I view this page as part prescriptive and part informative, and this
section is definitely more on the informative side.
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