/**
* 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.
*/
package org.apache.hadoop.mapred;
import java.util.Map;
/**
* This interface is intended for allowing schedulers to
* communicate with the queue share management implementation.
* Schedulers can periodically poll this interface to
* obtain the latest queue allocations.
*/
public interface QueueAllocator {
/**
* Used by schedulers to obtain queue allocations periodically
* @return hashtable of queue names and their allocations (shares)
*/
Map<String,QueueAllocation> getAllocation();
/**
* Used by schedulers to push queue usage info for
* accounting purposes.
* @param queue the queue name
* @param used of slots currently used
* @param pending number of tasks pending
*/
void setUsage(String queue, int used, int pending);
}