| /* |
| * 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; |
