path: root/exec/java-exec/src/main/java/org/apache/drill/exec/work/foreman/rm/package-info.java

/*
 * 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.
 */
/**
 * Provides resource management and queuing support for the Drill foreman.
 * The resource manager tracks total resources available to Drill. Several
 * implementations are available: a default implementation for systems without
 * queueing and an access-controlled (AC) version for systems with queues.
 * <p>
 * Each resource manager provides a per-query manager that is responsible
 * for queuing the query (if needed) and memory allocation to the query based
 * on query characteristics and memory assigned to the query.
 * <p>
 * Provides two different queue implementations. A distributed ZooKeeper queue
 * and a local queue useful for embedded Drillbits (and for testing.)
 */
package org.apache.drill.exec.work.foreman.rm;