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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7217) PUT method for update service for Service API doesn't function correctly
Date Tue, 19 Sep 2017 20:23:00 GMT
Eric Yang created YARN-7217:
-------------------------------

             Summary: PUT method for update service for Service API doesn't function correctly
                 Key: YARN-7217
                 URL: https://issues.apache.org/jira/browse/YARN-7217
             Project: Hadoop YARN
          Issue Type: Task
          Components: api, applications
            Reporter: Eric Yang


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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