Yes, as far is I know this issue is know.

+Kostas might have some more info regarding the plans there. Could you please 
comment?

> On 11. Apr 2017, at 19:57, vijayakumar palaniappan <[email protected]> 
> wrote:
> 
> While trying to use Pattern detection on KeyedStream, list of unique keys 
> encountered, keeps accumulating in AbstractKeyedCEPPatternOperator.java. On 
> encountering watermarks these accumulated keys are looped over to detect 
> patterns. This causes spike in CPU usage and progressively gets slower.
> 
> Is this a known issue
> Are there any workarounds?
> 
> This happens with 1.2.0 version
> 
> -- 
> Thanks,
> -Vijay

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