Github user gallenvara commented on the pull request:
https://github.com/apache/flink/pull/1956#issuecomment-216224456
@vasia i have noticed the `registerAggregator` can aggregate value in
distributed environment and i have used it at the very beginning of this issue.
But finally i failed because the aggregated value can only be get in the next
`superstep`. I want to get the value in `VertexUpdateFunction` of current
`superstep`. Can you give me some suggestions?
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