[jira] [Created] (NIFI-9361) Node can fail to DELETE connection while others finish if upstream component is funnel

["Mark Payne (Jira)" <ji...@apache.org>]

Mark Payne created NIFI-9361:
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             Summary: Node can fail to DELETE connection while others finish if upstream component is funnel
                 Key: NIFI-9361
                 URL: https://issues.apache.org/jira/browse/NIFI-9361
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
            Reporter: Mark Payne


When a Connection is deleted, it verifies 3 things before the deletion can occur:
1. The queue is empty
2. The source either is a Funnel or is stopped
3. The destination either is a Funnel or is stopped

This means that if we delete a connection whose source is a Funnel and whose destination is a Processor, we can have an issue where nodes in the cluster verify that the connection can be deleted.

Then, when the nodes go to perform the delete, a node can fail to perform the delete because it now has data.

To avoid this, if the source is a funnel, we need to look at its upstream components (recursively) until we encounter something other than a funnel or we reach a dead end. Only if all upstream components are stopped should we allow the connection to be deleted.



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