Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2378#issuecomment-56210084
@mengxr PickleSerializer do not compress data, there is CompressSerializer
can do it using gzip(level 1). Compression can help for small range of double
or repeated values, will be worser with random double in large range.
BatchedSerializer can help to reduce the overhead of name of class. In JVM,
the memory of short lived objects can not be reused without GC, so
batched-serialization will not increase the gc pressure if the batch size it
not too large. (depend on how gc is configured)
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