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    
019    package org.apache.hadoop.yarn.api.records;
020    
021    import org.apache.hadoop.classification.InterfaceAudience.Public;
022    import org.apache.hadoop.classification.InterfaceStability.Unstable;
023    
024    /**
025     * <p>State of a <code>Node</code>.</p>
026     */
027    @Public
028    @Unstable
029    public 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      public boolean isUnusable() {
049        return (this == UNHEALTHY || this == DECOMMISSIONED || this == LOST);
050      }
051    }