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https://issues.apache.org/jira/browse/NIFI-1926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15474296#comment-15474296
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Daniel Cave commented on NIFI-1926:
-----------------------------------
NIFI-2590 likely encompasses this requested functionality
> Create a general purpose Aggregating processor
> ----------------------------------------------
>
> Key: NIFI-1926
> URL: https://issues.apache.org/jira/browse/NIFI-1926
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Oleg Zhurakousky
> Assignee: Oleg Zhurakousky
>
> Based on multiple question on mailing list it appears that we need to have a
> general purpose processor to aggregate data (FlowFiles or content of
> FlowFiles etc). Basically provide an implementation of this
> http://www.enterpriseintegrationpatterns.com/patterns/messaging/Aggregator.html
> Keep in mind that while MergeContent processor could be looked at as one of
> the variation of aggregation, the pattern and the problem has much more
> moving parts that need to be addressed (release, correlation, and aggregation
> strategies). So the new processor should be flexible enough to handle variety
> of aggregation use cases.
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