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https://issues.apache.org/jira/browse/NIFI-2556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15418115#comment-15418115
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Sarah Olson commented on NIFI-2556:
-----------------------------------
I've written the following suggested text for the User Guide. Please have a
look and share any questions, comments, or edits.
Thanks very much!
~~~~~~~~~~~~
In addition to using FlowFile attributes, system properties, and environment
properties within Express Language, you can also define custom properties for
Expression Language use. Defining custom properties gives you more flexibility
in handling and processing dataflows. You can also create custom properties for
connection, server, and service properties, for easier dataflow configuration.
To create custom properties for use with Expression Language, identify one or
more sets of key/value pairs, and either add them manually to your processor
interface, or give them to your system administrator.
NiFi properties have resolution precedence of which you should be aware when
creating custom properties:
Processor-specific attributes
FlowFile properties
Flowfile attributes
>From variable registry:
User defined properties (custom properties)
System properties
OS environment variables
When you are creating custom properties, ensure that each custom property
contains a distinct property value, so that it is not overridden by existing
environment properties, system properties, or FlowFile attributes.
Once you have added the new custom properties, ensure that you have updated the
nifi.variable.registry.properties field in the nifi.properties file, with the
custom properties location.
> User Guide Update: Considerations for creating custom properties
> ----------------------------------------------------------------
>
> Key: NIFI-2556
> URL: https://issues.apache.org/jira/browse/NIFI-2556
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Documentation & Website
> Reporter: Sarah Olson
> Assignee: Sarah Olson
> Fix For: 1.0.0
>
>
> Update the User Guide with information about creating custom properties.
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