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From: Matt Gilman <matt.c.gilman@gmail.com>
Date: Thu, 4 May 2017 13:30:39 -0400
Message-ID: <CAFddr27=Ft-U+F9-FpA7i5RCYOd0sG7_FcFD5wb-TSq+_VAduA@mail.gmail.com>
Subject: Re: Issues with creating and connecting RPG programmatically
To: users@nifi.apache.org
Cc: dev@nifi.apache.org
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archived-at: Thu, 04 May 2017 17:30:44 -0000

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I've responded to the question on StackOverflow [1].

Thanks

Matt

[1]
http://stackoverflow.com/questions/43788780/nifi-issues-with-creating-and-connecting-rpg-programmatically/43789310#43789310

On Thu, May 4, 2017 at 12:49 PM, Pushkara R <pushkar1593@gmail.com> wrote:

> Hi,
>
> I am trying to write a function that takes two parameters, a processor ID
> in machine A and an input port in machine B and creates an RPG in machine B
> which connects the above to.
>
> Now, how I am doing that is
> 1. A POST to the
> */nifi-api/process-groups/<rootprocessgroupid>/remote-process-groups*
> endpoint to create an RPG and retrieve the ID of that RPG
> 2. A POST to the */nifi-api/process-groups/<rootprocessgroupid>/connections
> *endpoint to create a connection between the processor and the input
> port. the processorID and the ID of the input port are being provided along
> with the list of the relationships.
> 3. A final PUT to */nifi-api/remote-process-groups/<rpgid> *to enable the
> transmission between the machines*.*
>
> Now, the function always throws errors in step 2. A 409 is thrown for the
> POST request with the error being 'Unable to find specified destination'.
> (though refreshing the canvas on machine 1 shows the rpg having been
> created)
> However, when I manually run the steps 2 and 3 afterwards, with the same
> rpgid, the connection happens.
>
> Now, I'm not sure if this is a synchronization issue or not, but I want to
> figure it out because I would not want to separate out steps 1 2 and 3.
> Could somebody point out what could be the issue here?
>
> Pushkar
>
> PS - the post messages for steps 2 are the same when the api is called
> from within the function and manually.
>

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<div dir=3D"ltr">I&#39;ve responded to the question on StackOverflow [1].<d=
iv><br></div><div>Thanks</div><div><br></div><div>Matt</div><div><br></div>=
<div>[1]=C2=A0<a href=3D"http://stackoverflow.com/questions/43788780/nifi-i=
ssues-with-creating-and-connecting-rpg-programmatically/43789310#43789310">=
http://stackoverflow.com/questions/43788780/nifi-issues-with-creating-and-c=
onnecting-rpg-programmatically/43789310#43789310</a></div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, May 4, 2017 at 12:4=
9 PM, Pushkara R <span dir=3D"ltr">&lt;<a href=3D"mailto:pushkar1593@gmail.=
com" target=3D"_blank">pushkar1593@gmail.com</a>&gt;</span> wrote:<br><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex"><div dir=3D"ltr">Hi,<div><br></div><div>I am tryi=
ng to write a function that takes two parameters, a processor ID in machine=
 A and an input port in machine B and creates an RPG in machine B which con=
nects the above to.</div><div><br></div><div>Now, how I am doing that is</d=
iv><div>1. A POST to the <i>/nifi-api/process-groups/&lt;<wbr>rootprocessgr=
oupid&gt;/remote-<wbr>process-groups</i> endpoint to create an RPG and retr=
ieve the ID of that RPG</div><div>2. A POST to the <i>/nifi-api/process-gro=
ups/&lt;<wbr>rootprocessgroupid&gt;/<wbr>connections </i>endpoint to create=
 a connection between the processor and the input port. the processorID and=
 the ID of the input port are being provided along with the list of the rel=
ationships.</div><div>3. A final PUT to <i>/nifi-api/remote-process-<wbr>gr=
oups/&lt;rpgid&gt; </i>to enable the transmission between the machines<i>.<=
/i></div><div><i><br></i></div><div>Now, the function always throws errors =
in step 2. A 409 is thrown for the POST request with the error being &#39;U=
nable to find specified destination&#39;. (though refreshing the canvas on =
machine 1 shows the rpg having been created)</div><div>However, when I manu=
ally run the steps 2 and 3 afterwards, with the same rpgid, the connection =
happens.</div><div><br></div><div>Now, I&#39;m not sure if this is a synchr=
onization issue or not, but I want to figure it out because I would not wan=
t to separate out steps 1 2 and 3. Could somebody point out what could be t=
he issue here?</div><div><br></div><div>Pushkar</div><div><br></div><div>PS=
 - the post messages for steps 2 are the same when the api is called from w=
ithin the function and manually.</div></div>
</blockquote></div><br></div>

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