001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019package org.apache.hadoop.yarn.api.records; 020 021import org.apache.hadoop.classification.InterfaceAudience.Private; 022import org.apache.hadoop.classification.InterfaceAudience.Public; 023import org.apache.hadoop.classification.InterfaceStability.Stable; 024import org.apache.hadoop.classification.InterfaceStability.Unstable; 025 026/** 027 * <p><code>YarnClusterMetrics</code> represents cluster metrics.</p> 028 * 029 * <p>Currently only number of <code>NodeManager</code>s is provided.</p> 030 */ 031@Public 032@Stable 033public interface YarnClusterMetrics { 034 035 /** 036 * Get the number of <code>NodeManager</code>s in the cluster. 037 * @return number of <code>NodeManager</code>s in the cluster 038 */ 039 @Public 040 @Stable 041 public abstract int getNumNodeManagers(); 042 043 @Private 044 @Unstable 045 public abstract void setNumNodeManagers(int numNodeManagers); 046 047}