jgrier commented on issue #7099: [FLINK-10887] [jobmaster] Add source watermark tracking to the JobMaster URL: https://github.com/apache/flink/pull/7099#issuecomment-443739811 Sorry I haven't responded to this. We had a baby boy this week so that has kept me pretty busy ;) Okay, so I'm on board with generifying this further. @StephanEwen if we're to do a generic transient aggregator do you mean to allow the client to provide the aggregation function? In this case the API would look something like this: `CompletableFuture<R> updateAggregate( String aggregateName, T aggregand, BiFunction<T, R, R> aggregationFunction);` Is this what you had in mind?
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