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https://issues.apache.org/jira/browse/NIFI-3216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813638#comment-15813638
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Koji Kawamura commented on NIFI-3216:
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Yes, we also need an optional property in the Wait processor to specify which
count to check, if this is not specified, let it uses total count.
> 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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