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.Public;
022import org.apache.hadoop.classification.InterfaceStability.Unstable;
023
024/**
025 * <p>State of a <code>Node</code>.</p>
026 */
027@Public
028@Unstable
029public enum NodeState {
030  /** New node */
031  NEW, 
032  
033  /** Running node */
034  RUNNING, 
035  
036  /** Node is unhealthy */
037  UNHEALTHY, 
038  
039  /** Node is out of service */
040  DECOMMISSIONED, 
041  
042  /** Node has not sent a heartbeat for some configured time threshold*/
043  LOST, 
044  
045  /** Node has rebooted */
046  REBOOTED,
047
048  /** Node decommission is in progress */
049  DECOMMISSIONING;
050  
051  public boolean isUnusable() {
052    return (this == UNHEALTHY || this == DECOMMISSIONED || this == LOST);
053  }
054}