| /* |
| * 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. |
| */ |
| /** |
| * Hosts Apache Drill under Apache Hadoop YARN. Consists of two main |
| * components as required by YARN: a client application which uses YARN to |
| * start the Drill cluster, and an Application Master (AM) which manages |
| * the cluster. The AM in turn starts, manages and stops drillbits. |
| * <p> |
| * Much of the functionality is simply plumbing to get YARN to do what is |
| * needed. The core of the AM is a "cluster controller" which starts, |
| * monitors and stops Drillbits, tracking their state transitions though |
| * the several lifecycle stages that result. |
| * <p> |
| * Note about logs here: Drill-on-YARN is a YARN application and so it |
| * uses the same logging system used by the YARN code. This is different |
| * than that used by Drill. |
| */ |
| |
| package org.apache.drill.yarn; |