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From Boris Tyukin <>
Subject Re: use attributed defined in the same UpdateAttribute processor
Date Fri, 17 May 2019 00:54:24 GMT
thanks Andy. you also explained another thing that was bugging me with the
random order of attributes. Not a huge deal..

On Thu, May 16, 2019 at 7:54 PM Andy LoPresto <> wrote:

> You have to do this in two subsequent UpdateAttribute instances because
> the order of attribute definition (within an instance) is not
> deterministic. We have gotten a lot of questions about this, so perhaps it
> makes sense to investigate as a new feature. However, if that decision is
> made, I think substantial changes to the interface would need to be made to
> allow for manual reordering of property descriptors, which is not currently
> supported, and the transmission of that data via the DTOs in the API would
> need to be changed as well, because JSON keys are not ordered.
> Andy LoPresto
> * <>*
> PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4  BACE 3C6E F65B 2F7D EF69
> On May 16, 2019, at 2:08 PM, Boris Tyukin <> wrote:
> Hi guys,
> is it possible to reuse just defined attribute in another attribute in the
> same instance of UpdateAttribute processor or I really have to use two
> separate UpdateAttribute processors?
> For example, I define name=boris and then I want to add another attribute
> greetings=Hi ${name}
> If I do it in NiFi 1.9, greetings attribute is set to "Hi "

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