Ambari 2.4: How to add/delete/modify new property dynamically via service_advisor in a custom service?

[#1]

@Swapan Shridhar

Hi

I refereed to your solution for changing configurations for custom services

https://community.hortonworks.com/questions/46592/how-can-i-change-a-config-during-the-setup-of-a-ne...

I have few questions around that:

1)When is stack_advisor.py called in a service's life-cycle?

2)Now that stack_advisor is split into service_advisor in Ambari 2.4, is your solution for changing configuration still valid or some changes has to be made to make it work?

I have tried your solution with a TEST service.Attached the service zip file.

test.zip

-TEST service has test-env with 1 property app_name.

-It has service_advisor.py file where I read properties from test-env.xml and if any new property is found , it is added to the service's existing configuration using putProperty() method of parent stack_advisor.

-I test this by adding new property app_name2 into test-env and replace it with existing test-env ,after the service is already installed.

test-env.xml

-I am able to see recommendations call being made by inspecting element in browser and it has the new property app_name2.But I don't see new property added in configuration UI.

screenshot-from-2016-10-14-202447.png

[#2]

I am also facing the same issue. I am modifying the pig-env through service advisory which will get reflected in the file created under "Stack-recommendation" but nothing has been modified in the UI & while running the pig query changes is not get reflected in the pig classpath.

@Ali Bajwa @Ajaysingh

[#3]

Once the ServiceAdvisor implementation for your service is successfully loaded, you just need to go to the configuration UI and click the Set Recommended button besides your config file ( a small blue circular arrow shaped), which then loads the recommended property in your config file. I tried and it worked for me.