Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/1780#issuecomment-51168402
IIRC if kryo cant host entire serialized object in the buffer, it throws up
: we saw issues with it being as high as 256 kb for some of our jobs : though
we were using a different api (and it was slightly more complicated usecase).
Might be a good idea to verify this before changing default.
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