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.namenode;
019
020import org.apache.hadoop.classification.InterfaceAudience;
021import org.apache.hadoop.classification.InterfaceStability;
022
023/**
024 * This is the JMX management interface for NameNode status information
025 */
026@InterfaceAudience.Public
027@InterfaceStability.Evolving
028public interface NameNodeStatusMXBean {
029
030  /**
031   * Gets the NameNode role.
032   *
033   * @return the NameNode role.
034   */
035  public String getNNRole();
036
037  /**
038   * Gets the NameNode state.
039   *
040   * @return the NameNode state.
041   */
042  public String getState();
043
044  /**
045   * Gets the host and port colon separated.
046   *
047   * @return host and port colon separated.
048   */
049  public String getHostAndPort();
050
051  /**
052   * Gets if security is enabled.
053   *
054   * @return true, if security is enabled.
055   */
056  public boolean isSecurityEnabled();
057
058  /**
059   * Gets the most recent HA transition time in milliseconds from the epoch.
060   *
061   * @return the most recent HA transition time in milliseconds from the epoch.
062   */
063  public long getLastHATransitionTime();
064}