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https://issues.apache.org/jira/browse/NIFI-2579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16545089#comment-16545089
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Mike Thomsen commented on NIFI-2579:
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This could be a very dangerous feature because it is common for data to be a
few hundred kb or more, and that would quickly add up in memory use if there
are a lot of flowfiles.
> Support accessing FlowFile content directly via expression language
> -------------------------------------------------------------------
>
> Key: NIFI-2579
> URL: https://issues.apache.org/jira/browse/NIFI-2579
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Randy Gelhausen
> Priority: Major
>
> If you want to use a FlowFile's content in routing logic, or in metadata for
> external APIs, you must use an ExtractText processor to pull the content into
> an attribute. This is confusing and seems extraneous- the natural inclination
> is to dive into expression language seeking the "content" property which
> doesn't exist today.
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