Referencing parameters in CEM

Learn how to reference parameters using the Cloudera Edge Management (CEM) UI.

To configure an eligible property to reference a parameter, use the # symbol as the start, with the name of the parameter enclosed in curly braces:
#{Parameter.Name}
This can be escaped using an additional # character at the beginning. To illustrate this, assume that the parameter abc has a value of xxx and parameter def has a value of yyy. Then, the following user-defined property values will evaluate to these effective values:
User-Entered Literal Property Value Effective Property Value Explanation
#{abc} xxx Simple substitution
#{abc}/data xxx/data Simple substitution with additional literal data
#{abc}/#{def} xxx/yyy Multiple substitution with additional literal data
#{abc #{abc No { } for parameter replacement
#abc #abc No { } for parameter replacement
##{abc} #{abc} Escaped # for literal interpretation
###{abc} #xxx Escaped # for literal interpretation, followed by simple substitution
####{abc} ##{abc} Escaped # for literal interpretation, twice
#####{abc} ##xxx Escaped # for literal interpretation, twice, followed by simple substitution
#{abc/data} Exception thrown on property set operation / not a valid parameter name character
When referencing a parameter from within expression language, the parameter reference is evaluated first. As an example, to replace xxx with zzz for the abc parameter:
${ #{abc}:replace('xxx', 'zzz') }