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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