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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Defines all the selection policy implementation which can be configured with Resource Management. The
* configuration which is used to specify a policy is
* {@link org.apache.drill.exec.resourcemgr.config.ResourcePoolTreeImpl#ROOT_POOL_QUEUE_SELECTION_POLICY_KEY}. Selection Policy
* helps to select a single leaf ResourcePool out of all the eligible pools whose queue can be used to admit this query.
* Currently there are 3 types of supported policies. In future more policies can be supported by implementing
* {@link org.apache.drill.exec.resourcemgr.config.selectionpolicy.QueueSelectionPolicy} interface.
* <ul>
* <li>{@link org.apache.drill.exec.resourcemgr.config.selectionpolicy.DefaultQueueSelection}: Out of all the eligible pools
* this policy will choose a default pool in the list. If there are multiple default pools present in the list then
* it will return the first default pool. If there is no default pool present then it throws
* {@link org.apache.drill.exec.resourcemgr.config.exception.QueueSelectionException}
* </li>
* <li>{@link org.apache.drill.exec.resourcemgr.config.selectionpolicy.RandomQueueSelection}: Out of all the eligible pools
* this policy will choose a pool at random. If there are no pools to select from then it throws
* {@link org.apache.drill.exec.resourcemgr.config.exception.QueueSelectionException}
* </li>
* <li>{@link org.apache.drill.exec.resourcemgr.config.selectionpolicy.BestFitQueueSelection}: Out of all the eligible pools
* this policy will choose a pool whose queue configuration
* {@link org.apache.drill.exec.resourcemgr.config.QueryQueueConfigImpl#MAX_QUERY_MEMORY_PER_NODE_KEY} value is closest to
* the max memory on a node required by the query. It tries to find a pool whose value for MAX_QUERY_MEMORY_PER_NODE
* is equal to queries max memory per node requirement. If there is no such pool then find the pool with config value
* just greater than queries max memory per node. Otherwise find a pool with config value just less than queries
* max memory per node.
* </li>
* </ul>
*/
package org.apache.drill.exec.resourcemgr.config.selectionpolicy;
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