[jira] [Created] (KYLIN-4231) write conflict while add model by different query server parallelly

["ZhouKang (Jira)" <ji...@apache.org>]

ZhouKang created KYLIN-4231:
-------------------------------

             Summary: write conflict while add model by different query server parallelly
                 Key: KYLIN-4231
                 URL: https://issues.apache.org/jira/browse/KYLIN-4231
             Project: Kylin
          Issue Type: New Feature
            Reporter: ZhouKang


a kylin cluster have more than 1 query server, all of them are the backend server of nginx.

when our user use RESTful API to create model in the *same* project parallelly, there will be a problem.

the server returns:
{code:java}
// code placeholder
Overwriting conflict /project/learn_kylin.json, expect old TS 1572596034269, but it is 1572596042929
{code}
BUT, the model '/model_desc/xxx.json' has already in metastore, so the next time our user want

to retry (create model), he will get:
{code:java}
// code placeholder
Overwriting conflict /model_desc/test_945.json, expect old TS 0, but it is 1572596193812
{code}
I think the problem is that:

when server A receive PUT model, it will change the project info, but the cache update broadcast cannot be processed by server B before server B processing another model creation request.

 



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