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https://issues.apache.org/jira/browse/YARN-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Yang updated YARN-7217:
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Summary: Improve API service usability for updating service spec and state
(was: PUT method for update service for Service API doesn't function correctly)
> Improve API service usability for updating service spec and state
> -----------------------------------------------------------------
>
> Key: YARN-7217
> URL: https://issues.apache.org/jira/browse/YARN-7217
> Project: Hadoop YARN
> Issue Type: Task
> Components: api, applications
> Reporter: Eric Yang
> Assignee: Eric Yang
> Attachments: YARN-7217.yarn-native-services.001.patch,
> YARN-7217.yarn-native-services.002.patch,
> YARN-7217.yarn-native-services.003.patch,
> YARN-7217.yarn-native-services.004.patch
>
>
> The PUT method for updateService API provides multiple functions:
> # Stopping a service.
> # Start a service.
> # Increase or decrease number of containers.
> The overloading is buggy depending on how the configuration should be applied.
> Scenario 1
> A user retrieves Service object from getService call, and the Service object
> contains state: STARTED. The user would like to increase number of
> containers for the deployed service. The JSON has been updated to increase
> container count. The PUT method does not actually increase container count.
> Scenario 2
> A user retrieves Service object from getService call, and the Service object
> contains state: STOPPED. The user would like to make a environment
> configuration change. The configuration does not get updated after PUT
> method.
> This is possible to address by rearranging the logic of START/STOP after
> configuration update. However, there are other potential combinations that
> can break PUT method. For example, user like to make configuration changes,
> but not yet restart the service until a later time.
> The alternative is to separate the PUT method into PUT method for
> configuration vs status. This increase the number of action that can be
> performed. New API could look like:
> {code}
> @PUT
> /ws/v1/services/[service_name]/config
> Request Data:
> {
> "name":"[service_name]",
> "number_of_containers": 5
> }
> {code}
> {code}
> @PUT
> /ws/v1/services/[service_name]/state
> Request data:
> {
> "name": "[service_name]",
> "state": "STOPPED|STARTED"
> }
> {code}
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