Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18343
I ran a local test and a `Map[Int, Byte]` with 2000 elements serialized
with Kryo ends up at a little less than 14kB. That would be `4 + 4 * 2000 + 1 *
2000 = 9004B` using the custom serialization. That's better, but given both
numbers are pretty small anyway, just removing the transient looks ok. If it
becomes an issue in the future it's pretty easy to add the Kryo interface to
the mix.
LGTM.
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