[GitHub] [dolphinscheduler] github-actions[bot] commented on issue #11942: [Bug] [dolphinscheduler-service] NPE was raised when i open Workflow Definition UI after saving one Workflow Instance without selecting syncDefine

Wed, 14 Sep 2022 10:20:03 -0700 


github-actions[bot] commented on issue #11942:
URL: 
https://github.com/apache/dolphinscheduler/issues/11942#issuecomment-1247076771

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/dolphinscheduler/issues?q=is%3Aissue) and 
found no similar issues.
   
   
   ### What happened
   
   As the issue title said，steps as list:
   1. Define a Workflow and run it , then i got a Workflow Instance
   
![图片](https://user-images.githubusercontent.com/49931055/190185414-1e08269f-0196-46f7-937b-fa9a23d46844.png)
   
![图片](https://user-images.githubusercontent.com/49931055/190185644-e3236ae1-50e3-4bb9-9504-a4cf216b507e.png)
   
   2. Edit the Workflow Instance then saving it without selecting 'update 
definition' check-box . 
   
![图片](https://user-images.githubusercontent.com/49931055/190186198-a4ecdc2f-f23b-40f3-a363-3fa0b9b1a020.png)
   
   3. Return to the Workflow Definition UI , i got a error 
   
![图片](https://user-images.githubusercontent.com/49931055/190186425-94b87f35-2979-4d00-887f-a420d56d3bc6.png)
   and i found an NPE in the backend logs
   
![图片](https://user-images.githubusercontent.com/49931055/190187602-2b385326-5453-4e0d-8c13-2014b718215b.png)
   The direct cause is **THE VAR `processDefinitionLog` IS NULL**
   
![图片](https://user-images.githubusercontent.com/49931055/190188133-f0a67785-7e4a-4b56-adb7-701917454b5a.png)
   
   4. i check records in the meta-database(mysql style) and find that records 
accidentally lost in table `t_ds_process_definition_log` 
   There should be two records, their `version` column values ​​are 1 and 2 
respectively
   (直接原因是t_ds_process_definition_log表丢失了一条version列值为1的记录)
   
![图片](https://user-images.githubusercontent.com/49931055/190189561-d19c660e-264f-46a4-8077-366107406d0b.png)
   
   
   
   
   ### What you expected to happen
   
   No exception occurred
   
   ### How to reproduce
   
   The steps are listed in the paragraph **What happened** above
   
   ### Anything else
   
   I analysis the codes and i think the root is in method 
`org.apache.dolphinscheduler.service.process.ProcessServiceImpl#saveProcessDefine`:
 
   it query the `log obj` which according to the `ID` of the `definition obj` , 
then updating the `log obj` to set a new `version` .
   The `t_ds_process_definition_log` table should keeps all records of 
definition's changes and the record should not be overwritten or updated, which 
may be against the design 
   (根本原因是更新工作流实例时，根据工作流定义的ID查找了 `LOG 对象` 并修改了 `version值` , 
Log表应该保留所有定义变更的历史记录，不应该把version=1的记录更新掉。况且用定义对象的ID去查询更新LOG对象就不对。)
   
![图片](https://user-images.githubusercontent.com/49931055/190192100-3af59cb2-9c57-4d8a-9d19-41ee52c10649.png)
   
   
   ### Version
   
   dev
   
   ### Are you willing to submit PR?
   
   - [X] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)


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