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https://issues.apache.org/jira/browse/NIFI-5061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pierre Villard resolved NIFI-5061.
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Fix Version/s: 1.13.0
Resolution: Fixed
> NiFi documentation incomplete/wrong for EL hierarchy.
> -----------------------------------------------------
>
> Key: NIFI-5061
> URL: https://issues.apache.org/jira/browse/NIFI-5061
> Project: Apache NiFi
> Issue Type: Bug
> Components: Documentation & Website
> Affects Versions: 1.5.0
> Environment: N/A
> Reporter: Matthew Clarke
> Assignee: Alasdair Brown
> Priority: Major
> Labels: newbie
> Fix For: 1.13.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Within the NiFi Expression Language Guide under the "Structure of a NiFi
> Expression" section, the hierarchy of how NiFi searches for a Attribute key
> is wrong (still based off NiFi 0.x hierarchy) and incomplete:
> Current text:
> In this example, the value to be returned is the value of the "my attribute"
> value, if it exists. If that attribute does not exist, the Expression
> Language will then look for a System Environment Variable named "my
> attribute." If unable to find this, it will look for a JVM System Property
> named "my attribute." Finally, if none of these exists, the Expression
> Language will return a null value.
> The current hierarchy in NiFi is as follows:
> 1. Search FlowFile for Attribute/key
> 2. Search Process Group for attribute/key
> 3. Search File Registry File for attribute/key
> 4. Search NiFi JVM Properties for attribute/key
> 5. Search System Environment Variables for attribute/key
> We should not only fix the above, but in doing so make the above hierarchy
> more prominent in the documentation.
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