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https://issues.apache.org/jira/browse/NIFI-3414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15860874#comment-15860874
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ASF GitHub Bot commented on NIFI-3414:
--------------------------------------
GitHub user ijokarumawak opened a pull request:
https://github.com/apache/nifi/pull/1496
NIFI-3414: Added EnforceOrder processor
Use it with FirstInFirstOutPrioritizer, it can enforce original ordering
of 'out-of-order' FlowFiles.
nifi-mock is modified to support FlowFile assertion using Prioritizer.
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ijokarumawak/nifi nifi-3414
Alternatively you can review and apply these changes as the patch at:
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To close this pull request, make a commit to your master/trunk branch
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This closes #1496
----
commit a60fc5d88e1a1ab3190052f19e228908e996c818
Author: Koji Kawamura <ijokaruma...@apache.org>
Date: 2017-02-07T15:13:23Z
NIFI-3414: Added EnforceOrder processor
Use it with FirstInFirstOutPrioritizer, it can enforce original ordering
of 'out-of-order' FlowFiles.
nifi-mock is modified to support FlowFile assertion using Prioritizer.
----
> 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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