[GitHub] [incubator-druid] clintropolis opened pull request #6234: 'suspend' and 'resume' support for kafka indexing service

[GitHub]

changes:
* introduces `SuspendableSupervisorSpec` interface to describe supervisors 
which support suspend/resume functionality controlled through the 
`SupervisorManager`, which will gracefully shutdown the supervisor and it's 
tasks, update it's `SupervisorSpec` with either a suspended or running state, 
and update with the toggled spec. Spec updates are provided by 
`SuspendableSupervisorSpec.createSuspendedSpec` and 
`SuspendableSupervisorSpec.createRunningSpec` respectively.
* `KafkaSupervisorSpec` extends `SuspendableSupervisorSpec` and now supports 
suspend/resume functionality. The difference in behavior between 'running' and 
'suspended' state is whether the supervisor will attempt to ensure that 
indexing tasks are or are not running respectively. Behavior is identical 
otherwise.
* `SupervisorResource` now provides `/druid/indexer/v1/supervisor/{id}/suspend` 
and `/druid/indexer/v1/supervisor/{id}/resume` which are used to suspend/resume 
suspendable supervisors
* Deprecated `/druid/indexer/v1/supervisor/{id}/shutdown` and moved it's 
functionality to `/druid/indexer/v1/supervisor/{id}/terminate` since 'shutdown' 
is ambiguous verbage for something that effectively stops a supervisor forever
* Added ability to get all supervisor specs from `/druid/indexer/v1/supervisor` 
by supplying the 'full' query parameter `/druid/indexer/v1/supervisor?full` 
which will return a list of json objects of the form `{"id":<id>, 
"spec":<SupervisorSpec>}`
* Updated overlord console ui to enable suspend/resume, and changed 'shutdown' 
to 'terminate'

<img width="606" alt="screen shot 2018-08-24 at 5 03 44 pm" 
src="https://user-images.githubusercontent.com/1577461/44626025-6ff53080-a8ca-11e8-86e6-8d282d00d12e.png";>

<img width="607" alt="screen shot 2018-08-24 at 5 03 33 pm" 
src="https://user-images.githubusercontent.com/1577461/44626026-74b9e480-a8ca-11e8-8e47-b3b9de17e644.png";>


[ Full content available at: 
https://github.com/apache/incubator-druid/pull/6234 ]
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