org.apache.drill.exec.resourcemgr.config.selectionpolicy

Class BestFitQueueSelection

java.lang.Object

org.apache.drill.exec.resourcemgr.config.selectionpolicy.AbstractQueueSelectionPolicy

org.apache.drill.exec.resourcemgr.config.selectionpolicy.BestFitQueueSelection

All Implemented Interfaces:

QueueSelectionPolicy

public class BestFitQueueSelection
extends AbstractQueueSelectionPolicy

Helps to select a queue whose QueryQueueConfig.getMaxQueryMemoryInMBPerNode() is nearest to the max memory on a node required by the given query. Nearest is found by following rule:

• Queue whose QueryQueueConfigImpl.MAX_QUERY_MEMORY_PER_NODE_KEY is equal to max memory per node of given query
• Queue whose QueryQueueConfigImpl.MAX_QUERY_MEMORY_PER_NODE_KEY is just greater than max memory per node of given query. From all queues whose max_query_memory_per_node is greater than what is needed by the query, the queue with minimum value is chosen.
• Queue whose QueryQueueConfigImpl.MAX_QUERY_MEMORY_PER_NODE_KEY is just less than max memory per node of given query. From all queues whose max_query_memory_per_node is less than what is needed by the query, the queue with maximum value is chosen.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.exec.resourcemgr.config.selectionpolicy.QueueSelectionPolicy

QueueSelectionPolicy.SelectionPolicy

Constructor Summary

Constructors

Constructor and Description
BestFitQueueSelection()

Method Summary

Modifier and Type	Method and Description
ResourcePool	selectQueue(List<ResourcePool> allPools, QueryContext queryContext, NodeResources maxResourcePerNode)

Methods inherited from class org.apache.drill.exec.resourcemgr.config.selectionpolicy.AbstractQueueSelectionPolicy

getSelectionPolicy

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BestFitQueueSelection

public BestFitQueueSelection()

Method Detail

selectQueue

public ResourcePool selectQueue(List<ResourcePool> allPools,
                                QueryContext queryContext,
                                NodeResources maxResourcePerNode)
                         throws QueueSelectionException

Specified by:

selectQueue in interface QueueSelectionPolicy

Specified by:

selectQueue in class AbstractQueueSelectionPolicy

Throws:

QueueSelectionException