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From Koji Kawamura <>
Subject Re: use case similar to Wait/Notify
Date Tue, 11 Jul 2017 04:23:00 GMT
Hi Yuri,

That is achievable with Wait/Notify processors. The tricky part is how
to setup the initial state in a DistributedMapCache in order to pass
the first incoming FlowFile.
Currently, Wait/Notify processor doesn't provide a way to do that but
you can so by FetchDistributedMapCache.

I created an example flow. Template is available here, with its screenshot:

On the right top of flow, I used GenerateFlowFile and
FetchDistributedMapCache to send a FlowFile to Notify, only if there
is no existing target cache key. It periodically check and create one
if necessary.

On the left side, I simulated incoming FlowFiles those will be queued
and processed one by one.

Hope this helps.


On Tue, Jul 11, 2017 at 12:35 AM, Yuri Krysko <> wrote:
> Good morning Everyone,
> I am trying to see if I could make my scenario work with Wait/Notify processors. Basically,
I require the following implementation:
>   1.  Pass a single flow file into a processor group
>   2.  Keep subsequent all flow flies in a wait queue until the first flow file is processed
and sent out of the processor group to Notify processor, which updates the cache.
> Would I be able to accomplish this scenario without writing a custom processor?
> Thanks much,
> Yuri
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