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https://issues.apache.org/jira/browse/NIFI-3216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15812535#comment-15812535
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Bryan Bende commented on NIFI-3216:
-----------------------------------
Also, I had originally linked NIFI-3214 to this ticket because I was thinking
we needed that change first. We can either turn that ticket into the ticket for
adding the replace method to the cache, or we can just unlink this ticket from
NIFI-3214 and do all the work under this ticket.
> 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
>
> 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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