[NIFI-8514] Add EL support to DistributeLoad

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: Core UI
• Assignee: Unassigned
• Reporter: John Wise
• Created: 04/May/21 16:23
• Updated: 04/May/21 16:32

Description

We'd like to be able to feed a list of values to DistributeLoad and use EL to establish the "Number of Relationships" value from the count of those list values.  That would allow us to define a list of URL, hostnames, etc. in a preceding attribute, which DistributeLoad could then enumerate on its own, to dynamically establish the number of relationships.

For instance, when provided a list of URLs in an attribute named urlList, DistributeLoad could then determine the relationship count with ${allDelineatedValues(${urlList}, ","):count()}.  A subsequent UpdateAttribute processor could then extract the appropriate URL from ${urlList} with getDelimitedField, based on the relationship number provided by DistributeLoad.