[KYLIN-4231] write conflict while add model by different query server parallelly

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Assignee: Unassigned
• Reporter: ZhouKang
• Created: 01/Nov/19 08:19
• Updated: 03/Mar/20 08:28
• Resolved: 28/Feb/20 13:39

Description

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 placeholder
Overwriting conflict /project/learn_kylin.json, expect old TS 1572596034269, but it is 1572596042929

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 placeholder
Overwriting conflict /model_desc/test_945.json, expect old TS 0, but it is 1572596193812

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.

 

Sub-Tasks

• rollback when addModelToProject failed.: Closed