Github user zentol commented on the pull request:
https://github.com/apache/incubator-flink/pull/210#issuecomment-63363046
Does this work when using `count()` or `collect()` multiple times in the
same plan?
you use `this.getExecutionEnvironment().getIdString()` to identify the
accumulators, and as far as i see this value is the same for all operators in a
plan. As such, multiple usages of `count()` will return the sum count of all
datasets, and collect() will throw an exception since the same key is used when
calling `getRuntimeContext().addAccumulator(id, accumulator)`
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