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https://issues.apache.org/jira/browse/FLINK-3758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249718#comment-15249718
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Aljoscha Krettek commented on FLINK-3758:
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Yes, I think it should work but we would need to add another method that does
both {{addAccumulator()}} and {{getAccumulator()}} in one function. Right now,
you have to do {{addAccumulator()}} one time and then in the future use
{{getAccumulator()}}. In the {{Trigger}} we would not know when to call
{{addAccumulator()}}. This new method could be called
{{getOrAddAccumulator()}}, or just {{getAccumulator(String name, Accumulator
defaultAccumulator)}}. (I prefer the second name.)
> Add possibility to register accumulators in custom triggers
> -----------------------------------------------------------
>
> Key: FLINK-3758
> URL: https://issues.apache.org/jira/browse/FLINK-3758
> Project: Flink
> Issue Type: Improvement
> Reporter: Konstantin Knauf
> Priority: Minor
>
> For monitoring purposes it would be nice to be able to to use accumulators in
> custom trigger functions.
> Basically, the trigger context could just expose {{getAccumulator}} of
> {{RuntimeContext}} or does this create problems I am not aware of?
> Adding accumulators in a trigger function is more difficult, I think, but
> that's not really neccessary as the accummulator could just be added in some
> other upstream operator.
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