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https://issues.apache.org/jira/browse/NIFI-3414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963320#comment-15963320
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ASF GitHub Bot commented on NIFI-3414:
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Github user asfgit closed the pull request at:
https://github.com/apache/nifi/pull/1496
> Implement an EnforceOrder processor
> -----------------------------------
>
> Key: NIFI-3414
> URL: https://issues.apache.org/jira/browse/NIFI-3414
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Matt Burgess
> Assignee: Koji Kawamura
>
> For some flows, it is imperative that the flow files are processed in a
> certain order. The PriorityAttributePrioritizer can be used on a connection
> to ensure that flow files going through that connection are in priority
> order, but depending on error-handling, branching, and other flow designs, it
> is possible for flow files to get out-of-order.
> I propose an EnforceOrder processor, which would be single-threaded and have
> (at a minimum) the following properties:
> 1) Order Attribute: This would be the name of a flow file attribute from
> which the current value will be retrieved.
> 2) Initial Value: This property specifies an initial value for the order. The
> processor is stateful, however, so this property is only used when there is
> no entry in the state map for current value.
> The processor would store the Initial Value into the state map (if no state
> map entry exists), then for each incoming flow file, it checks the value in
> the Order Attribute against the current value. If the attribute value
> matches the current value, the flow file is transferred to the "success"
> relationship, and the current value is incremented in the state map. If the
> attribute value does not match the current value, the session will be rolled
> back.
> Using this processor, along with a PriorityAttributePrioritizer on the
> incoming connection, will allow for out-of-order flow files to have a sort of
> "barrier", thereby guaranteeing that flow files transferred to the "success"
> relationship are in the specified order.
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