Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1979
Sorry for chiming in late.
I was wondering whether we actually need accumulators here, or what we
should add is access to the metrics. Because the use case seems to be
"monitoring", not "side aggregates".
Admittedly, the accumulators were the means of choice for metrics up to
now, but for the future (now that we are adding proper metrics), we may want to
fix this.
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