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https://issues.apache.org/jira/browse/NIFI-3216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15816011#comment-15816011
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Joseph Gresock commented on NIFI-3216:
--------------------------------------

I like all of these additions, and concur that they should still capture the 
original single-key use case.  Just so I'm clear, the key would still just be a 
value, not a regex?  i.e., you'd have to receive N flow files with the exact 
same attribute value in order to increment the counter N times for that key?

> Add ability to wait for N signals to Wait/Notify processors
> -----------------------------------------------------------
>
>                 Key: NIFI-3216
>                 URL: https://issues.apache.org/jira/browse/NIFI-3216
>             Project: Apache NiFi
>          Issue Type: Improvement
>    Affects Versions: 1.2.0
>            Reporter: Bryan Bende
>            Assignee: Koji Kawamura
>
> The recently added Wait and Notify processors allow a flow file to be held at 
> the Wait processor until a signal is received in the Notify processor. It 
> would be nice to be able to wait for N signals before releasing.
> One way this could be done is to have a property like "Signal Count" on the 
> Wait processor, and then count the keys in the cache starting with some 
> pattern, and release when the # of keys equals the signal count.
> This would require the ability to get all the keys from the cache, or at 
> least get all keys matching a pattern: 
> https://issues.apache.org/jira/browse/NIFI-3214



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