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 */
018package org.apache.hadoop.hdfs.server.datanode;
019
020import org.apache.hadoop.classification.InterfaceAudience;
021import org.apache.hadoop.classification.InterfaceStability;
022
023/**
024 * 
025 * This is the JMX management interface for data node information
026 */
027@InterfaceAudience.Public
028@InterfaceStability.Stable
029public interface DataNodeMXBean {
030  
031  /**
032   * Gets the version of Hadoop.
033   * 
034   * @return the version of Hadoop
035   */
036  public String getVersion();
037  
038  /**
039   * Gets the rpc port.
040   * 
041   * @return the rpc port
042   */
043  public String getRpcPort();
044  
045  /**
046   * Gets the http port.
047   * 
048   * @return the http port
049   */
050  public String getHttpPort();
051  
052  /**
053   * Gets the namenode IP addresses
054   * 
055   * @return the namenode IP addresses that the datanode is talking to
056   */
057  public String getNamenodeAddresses();
058  
059  /**
060   * Gets the information of each volume on the Datanode. Please
061   * see the implementation for the format of returned information.
062   * 
063   * @return the volume info
064   */
065  public String getVolumeInfo();
066  
067  /**
068   * Gets the cluster id.
069   * 
070   * @return the cluster id
071   */
072  public String getClusterId();
073
074  /**
075   * Returns an estimate of the number of Datanode threads
076   * actively transferring blocks.
077   */
078  public int getXceiverCount();
079}