Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/506#issuecomment-41209849
@mengxr This is really cool and the performance wins look awesome. Apart
from the inline comments, I just one more idea: Instead of using cache + rdd
re-partitioning in each step, how expensive is it to do a reduceByKey at each
iteration and adjust the keys appropriately ? I think some serialization +
de-serialization overheads might add up, but it'll simplify the clean up /
caching etc.
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