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Commit bcfee153 authored by Wenchen Fan's avatar Wenchen Fan Committed by Andrew Or
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[SPARK-12837][CORE] reduce network IO for accumulators

Sending un-updated accumulators back to driver makes no sense, as merging a zero value accumulator is a no-op. We should only send back updated accumulators, to save network IO.

new test in `TaskContextSuite`

Author: Wenchen Fan <wenchen@databricks.com>

Closes #12899 from cloud-fan/acc.
parent 0b9cae42
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