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I am trying to create >100 items as AllowedAttributeValue using WSAPI in Rally from python without pyral. Input is from a input file. Code - 

for line in inputFile:
    body = {<body>}
    try:
        r = requests.post(url, headers=headers, data=body, proxies=proxy)

Not all 100 rows are getting updated. number vary from 40-70. Error :

["Concurrency conflict: [Object has been modified since being read for update in this context] - ConcurrencyConflictException : Modified since read on update : Object Class : com.f4tech.slm.domain.WorkspaceConfiguration : ObjectID : <objid>"], "Warnings": []}}

Looking for a resolution. Appreciate your help!

Sujoy
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1 Answers1

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I'm not super familiar with the python toolkit, but in general this usually happens when you're bouncing around between app servers and you're firing off requests faster than the cache sync can occur. WSAPI writes are eventually consistent across the system, immediately consistent on the app server node that handled the request. Since all of your creates are modifying the same object (they all reference the same AttributeDefinition) you can get ConcurrencyConflictExceptions.

Is there a way in the python toolkit to enable cookies? That usually works, since the load balancer should pin you to a specific node. It should also be faster, since it won't have to do the auth roundtrip on each request either.

Kyle Morse
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  • Thanks @Kyle Morse for the suggestion. I have not tried the cookies yet (its in my to do list), but a time delay along with a thread lock is a workaround as of now (I know thats not a good coding standard). It seems the WSAPI write time duration is more than 0.5 sec (i dont know the exact time) and python is trying to push faster than that. Thank you for the recommendation. – Sujoy Sep 27 '18 at 18:29
  • @Kyle Morse why is none of that explained here: https://rally1.rallydev.com/slm/doc/webservice/authentication.jsp – Jason Dec 20 '19 at 15:30