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https://issues.apache.org/jira/browse/NIFI-4028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Villard reassigned NIFI-4028:
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Assignee: Pierre Villard (was: Koji Kawamura)
> Wait processor removes cache regardless of the remaing counter
> --------------------------------------------------------------
>
> Key: NIFI-4028
> URL: https://issues.apache.org/jira/browse/NIFI-4028
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.2.0
> Reporter: Koji Kawamura
> Assignee: Pierre Villard
> Attachments: WaitNotify_NIFI-4028.xml
>
>
> Current [Wait processor implementation removes cache
> entry|https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/Wait.java#L438]
> if it's configured with 'Releasable FlowFile Count' is one, when it finds a
> wait signal reaches to 'Target Signal Count' no matter how large the current
> count is.
> This behavior can be problematic, when an user expects the same Signal
> Identifier to be released multiple FlowFiles one by one while multiple counts
> to be accumulated by Notify.
> For example this scenario does not work:
> {code}
> 1. Notify notifies to a 'signal-a' + 1 => 'signal-a' = 1
> 2. Notify notifies to a 'signal-a' again, +1 => 'signal-a' = 2
> 3. Wait releases 1 FlowFile, then remove the 'signal-a' => 'signal-a' is
> removed
> 4. Wait will not be able to release another FlowFile
> {code}
> This should be fixed as follows:
> {code}
> 1. Notify notifies to a 'signal-a' + 1 => 'signal-a' = 1
> 2. Notify notifies to a 'signal-a' again, +1 => 'signal-a' = 2
> 3. Wait releases 1 FlowFile, then update the 'signal-a', -1 => 'signal-a' = 1
> 4. Wait releases another FlowFile, then 'signal-a' becomes 0, remove
> 'signal-a'
> {code}
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