Start process smart service triggers another process twice

RE: Start process smart service triggers another process twice

Richard Michaelis — Fri, 13 Nov 2020 07:47:00 GMT

Hi,

i added a documentation of this observation.
On top: the issue is not even persistent.

Currently for today, we have just two parallel running instances. the third didn't appear so far.

community.appian.com/.../APPIAN-Incident.docx

RE: Start process smart service triggers another process twice

Richard Michaelis — Fri, 13 Nov 2020 07:41:59 GMT

hi,

i couldnt find any node with two instances.

RE: Start process smart service triggers another process twice

Scott Milton — Thu, 12 Nov 2020 22:10:39 GMT

So are you able to add more information to the process to help debug the situation? e.g., if the implementation has it's own alternative chaining model instead of subprocesses, just create a parent process model Id parameter and when the chained process is created, the initiating process can pass in it's own ID to this parameter and then you should be able to see which "parent" started the problematic processes.

RE: Start process smart service triggers another process twice

davel001150 — Thu, 12 Nov 2020 21:35:01 GMT

The most important question would be whether you have two instances of any nodes prior to the last node that calls a copy of itself.

RE: Start process smart service triggers another process twice

Richard Michaelis — Thu, 12 Nov 2020 06:59:45 GMT

to 1) it is not configured. one process instance should start just one other. thats the basic idea. one by one as chain.

to 2.) this option is disabled. The first version of the process was built november 2017 and the this version is life since july 2018

to 3.) it is ensured by the condition, that the entitydata is searching for a specific status. this status will be changed and saved in a instance life cycle, so the next search excludes the current id.

to4.) as we are talking about "start process" smart service, it should be always asynchronous. There are no subprocesses.

Just to give an impression: we are talking about more than 12,000 instances by just this process in the last 24 hours. in total for all used models there are about 37,000 processes in the last 24 hours, not available directly deleted ones.

RE: Start process smart service triggers another process twice

Scott Milton — Wed, 11 Nov 2020 15:32:56 GMT

Do you have MNI/Multiple Instances configured on the Start Process Smart Service Node? Check on the Other tab after double clicking on the node in the process modeler.
If you go into one of the unexpected processes in the Designer Monitoring tab and then use the File menu option to Open Parent Process, what is opened?
If you are calling the same process model again, how are you ensuring that the query never returns the same ID again and that there is never a race condition?
- Are all of the nodes in the main process model and all child subprocesses, etc., synchronous or are there some that are asynchronous?