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From Bryan Bende <>
Subject Re: Re: nifi 1.4 - variables
Date Wed, 04 Oct 2017 15:39:00 GMT

There is a JIRA to add additional documentation to the user guide [1].
For the previously existing capabilities with the properties file,
there is some mention in the admin guide [2].

The variables work in a hierarchical manner, meaning if a variable
"foo" is declared at the root group and also declared inside a process
group, components inside the process group will use the value of "foo"
from within the process group.

If you test this out, the UI should indicate which one is being
used... In the above example, if you looked at the variables from
within the process group, you should see "foo" listed twice, but the
one from the root group would have a line through it indicating that
it is being overridden.



On Wed, Oct 4, 2017 at 11:26 AM, Uwe Geercken <> wrote:
> thank you Bryan.
> is there documentation around for the variables?
> If I add variables to the processor group and I want to reference a variable
> of the parent flow, will I have to add the scope somehow like
> ${scope.variable}?
> If I have variables in different hierarchies of the flow with the same name,
> which one will be used?
> P.S. I really like your blog :-)
> Rgds,
> Uwe
> Gesendet: Mittwoch, 04. Oktober 2017 um 16:40 Uhr
> Von: "Bryan Bende" <>
> An:
> Betreff: Re: nifi 1.4 - variables
> Hello,
> You can use them in any fields that support expression language, just
> like variables in a properties file
> ( in or system
> properties in bootstrap.conf.
> In the properties file approach you had to restart NiFi for any
> changes in the properties to be picked up.
> In the new approach you no longer need to restart anything yourself,
> it will be handled for you.
> -Bryan
> On Wed, Oct 4, 2017 at 8:20 AM, Uwe Geercken <> wrote:
>> Hello,
>> in 1.4 when you right-click the processor group then there is an entry
>> "variables". I have defined some, but I wonder how I can use them.
>> I have not found documentation on this. Does somebody have details or a
>> link to documentation or an example?
>> Rgds,
>> Uwe

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