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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