Hi Federico,
If I understand your question correctly, then yes, the application of a Pattern
on a keyed stream
is similar to the application of a map function.
It will search for the pattern on each per-key stream of data.
So there will be state (buffer with partial matches, queued elements, etc) for
every active key.
Cheers,
Kostas
> On Oct 19, 2017, at 11:55 AM, Federico D'Ambrosio
> <federico.dambro...@smartlab.ws> wrote:
>
> Hi all,
>
> I was wondering if it is correct to assume the application of a pattern on a
> KeyedStream similar to the application, e.g., of a MapFunction when it comes
> to state.
>
> For example, the following
>
> val pattern = ...
> val keyedStream = stream.keyBy("id")
>
> val patternKeyedStream = CEP.pattern(pattern, keyedStream)
>
> val anotherKeyedStream = patternKeyedStream.select(...)
>
> should only check the pattern on each single partition value.
>
> Am I correct in assuming this, or I have misunderstood CEP functioning?
>
> --
> Federico D'Ambrosio
