Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/5572#issuecomment-105255537
@squito pulling iterator of rdd2 out of the loop will have improvement. But
as if a worker has more than one partition of rdd1, it still needs to fetch
these remote blocks more than once. Catching these remote blocks can remove
these redundant fetching.
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