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YARN-7633. Documentation for auto queue creation feature and related configurations. Contributed by Suma Shivaprasad.

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Sunil G 2017-12-15 23:06:53 +05:30
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hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/CapacityScheduler.md
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@ -66,6 +66,8 @@ The `CapacityScheduler` supports the following features:
* **Absolute Resource Configuration** - Administrators could specify absolute resources to a queue instead of providing percentage based values. This provides better control for admins to configure required amount of resources for a given queue.
* **Dynamic Auto-Creation and Management of Leaf Queues** - This feature supports auto-creation of **leaf queues** in conjunction with **queue-mapping** which currently supports **user-group** based queue mappings for application placement to a queue. The scheduler also supports capacity management for these queues based on a policy configured on the parent queue.
Configuration
-------------
@ -274,6 +276,92 @@ The `ReservationSystem` is integrated with the `CapacityScheduler` queue hierach
| `yarn.scheduler.capacity.<queue-path>.reservation-planner` | *Optional* parameter: the class name that will be used to determine the implementation of the *Planner* which will be invoked if the `Plan` capacity fall below (due to scheduled maintenance or node failuers) the user reserved resources. The default value is *org.apache.hadoop.yarn.server.resourcemanager.reservation.planning.SimpleCapacityReplanner* which scans the `Plan` and greedily removes reservations in reversed order of acceptance (LIFO) till the reserved resources are within the `Plan` capacity |
| `yarn.scheduler.capacity.<queue-path>.reservation-enforcement-window` | *Optional* parameter representing the time in milliseconds for which the `Planner` will validate if the constraints in the Plan are satisfied. Long value expected. The default value is one hour. |
###Dynamic Auto-Creation and Management of Leaf Queues
The `CapacityScheduler` supports auto-creation of **leaf queues** under parent queues which have been configured to enable this feature.
* Setup for dynamic auto-created leaf queues through queue mapping
**user-group queue mapping(s)** listed in `yarn.scheduler.capacity.queue-mappings` need to specify an additional parent queue parameter to
identify which parent queue the auto-created leaf queues need to be created
under. Refer above `Queue Mapping based on User or Group` section for more
details. Please note that such parent queues also need to enable
auto-creation of child queues as mentioned in `Parent queue configuration
for dynamic leaf queue creation and management` section below
Example:
```
<property>
<name>yarn.scheduler.capacity.queue-mappings</name>
<value>u:user1:queue1,g:group1:queue2,u:user2:%primary_group,u:%user:parent1.%user</value>
<description>
Here, u:%user:parent1.%user mapping allows any <user> other than user1,
user2 to be mapped to its own user specific leaf queue which
will be auto-created under <parent1>.
</description>
</property>
```
* Parent queue configuration for dynamic leaf queue auto-creation and management
The `Dynamic Queue Auto-Creation and Management` feature is integrated with the
`CapacityScheduler` queue hierarchy and can be configured for a **ParentQueue** currently to auto-create leaf queues. Such parent queues do not
support other pre-configured queues to co-exist along with auto-created queues. The `CapacityScheduler` supports the following parameters to enable auto-creation of queues
| Property | Description |
|:---- |:---- |
| `yarn.scheduler.capacity.<queue-path>.auto-create-child-queue.enabled` | *Mandatory* parameter: Indicates to the `CapacityScheduler` that auto leaf queue creation needs to be enabled for the specified parent queue. Boolean value expected. The default value is *false*, i.e. auto leaf queue creation is not enabled in *ParentQueue* by default. |
| `yarn.scheduler.capacity.<queue-path>.auto-create-child-queue.management-policy` | *Optional* parameter: the class name that will be used to determine the implementation of the `AutoCreatedQueueManagementPolicy` which will manage leaf queues and their capacities dynamically under this parent queue. The default value is *org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.queuemanagement.GuaranteedOrZeroCapacityOverTimePolicy*. Users or groups might submit applications to the auto-created leaf queues for a limited time and stop using them. Hence there could be more number of leaf queues auto-created under the parent queue than its guaranteed capacity. The current policy implementation allots either configured or zero capacity on a **best-effort** basis based on availability of capacity on the parent queue and the application submission order across leaf queues. |
* Configuring `Auto-Created Leaf Queues` with `CapacityScheduler`
The parent queue which has been enabled for auto leaf queue creation,supports
the configuration of template parameters for automatic configuration of the auto-created leaf queues. The auto-created queues support all of the
leaf queue configuration parameters except for **Queue ACL**, **Absolute
Resource** configurations and **Node Labels**. Queue ACLs and Node Labels are
currently inherited from the parent queue i.e they are not configurable on the leaf queue template
| Property | Description |
|:---- |:---- |
| `yarn.scheduler.capacity.<queue-path>.leaf-queue-template.capacity` | *Mandatory* parameter: Specifies the minimum guaranteed capacity for the auto-created leaf queues. Currently *Absolute Resource* configurations are not supported on auto-created leaf queues |
| `yarn.scheduler.capacity.<queue-path>.leaf-queue-template.<leaf-queue-property>` | *Optional* parameter: For other queue parameters that can be configured on auto-created leaf queues like maximum-capacity, user-limit-factor, maximum-am-resource-percent ... - Refer **Queue Properties** section |
Example:
```
<property>
<name>yarn.scheduler.capacity.root.parent1.auto-create-child-queue.enabled</name>
<value>true</value>
</property>
<property>
<name>yarn.scheduler.capacity.root.parent1.leaf-queue-template.capacity</name>
<value>5</value>
</property>
<property>
<name>yarn.scheduler.capacity.root.parent1.leaf-queue-template.maximum-capacity</name>
<value>100</value>
</property>
<property>
<name>yarn.scheduler.capacity.root.parent1.leaf-queue-template.user-limit-factor</name>
<value>3.0</value>
</property>
<property>
<name>yarn.scheduler.capacity.root.parent1.leaf-queue-template.ordering-policy</name>
<value>fair</value>
</property>
```
* Scheduling Edit Policy configuration for auto-created queue management
Admins need to specify an additional `org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.QueueManagementDynamicEditPolicy` scheduling edit policy to the
list of current scheduling edit policies as a comma separated string in `yarn.resourcemanager.scheduler.monitor.policies` configuration. For more details, refer `Capacity Scheduler container preemption` section above
| Property | Description |
|:---- |:---- |
| `yarn.resourcemanager.monitor.capacity.queue-management.monitoring-interval` | Time in milliseconds between invocations of this QueueManagementDynamicEditPolicy policy. Default value is 1500 |
###Other Properties
* Resource Calculator