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.Stable;
023    
024    /**
025     * <p>
026     * <code>ClientToken</code> is the security token used by the AMs to verify
027     * authenticity of any <code>client</code>.
028     * </p>
029     * 
030     * <p>
031     * The <code>ResourceManager</code>, provides a secure token (via
032     * {@link ApplicationReport#getClientToken()}) which is verified by the
033     * ApplicationMaster when the client directly talks to an AM.
034     * </p>
035     * 
036     */
037    @Public
038    @Stable
039    public interface ClientToken extends Token {}