Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/17596
The approach I took for this was slightly different.
* Create a bitmask indicating which accumulators are required in
TaskMetrics - that is, have non zero values, and emit this first.
* Instead of relying on default serialization, simply do custom
serialization for all internal accumulators - directly emit the long's (based
on the bitmask for writing/reading).
* Encode long/int's so that they take less than 8/4 bytes (currently this
is sitting inside graphx iirc - essentially same code as from kryo for
optimizePositve)
For 1.6, this brought down the size from 1.6k or so average down to 200+
bytes
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