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Apache NiFI => ListFTP generate duplicate flowfiles when primary node change

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I am running a NiFi cluster with 2 nodes. When I disconnected a node for changing primary, the ListFTP processor relists the listed files. 

Screen Shot 2021-08-08 at 17.03.01.png

Screen Shot 2021-08-08 at 17.03.24.png



 I read the ListFTP document at: and see that the: If a new Primary Node is selected, the new node will not duplicate the data that was listed by the previous Primary Node.

Screen Shot 2021-08-08 at 17.05.51.png

But why I met the above situation, can anyone help me?


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