hadoop NameNodeStatusMXBean 源码

  • 2022-10-20
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haddop NameNodeStatusMXBean 代码


 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.hadoop.hdfs.server.namenode;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

 * This is the JMX management interface for NameNode status information.
 * End users shouldn't be implementing these interfaces, and instead
 * access this information through the JMX APIs. *
public interface NameNodeStatusMXBean {

   * Gets the NameNode role.
   * @return the NameNode role.
  public String getNNRole();

   * Gets the NameNode state.
   * @return the NameNode state.
  public String getState();

   * Gets the host and port colon separated.
   * @return host and port colon separated.
  public String getHostAndPort();

   * Gets if security is enabled.
   * @return true, if security is enabled.
  public boolean isSecurityEnabled();

   * Gets the most recent HA transition time in milliseconds from the epoch.
   * @return the most recent HA transition time in milliseconds from the epoch.
  public long getLastHATransitionTime();

   * Gets number of bytes in blocks with future generation stamps.
   * @return number of bytes that can be deleted if exited from safe mode.
  long getBytesWithFutureGenerationStamps();

   * Retrieves information about slow DataNodes, if the feature is
   * enabled. The report is in a JSON format.
  String getSlowPeersReport();

   *  Gets the topN slow disks in the cluster, if the feature is enabled.
   *  @return JSON string of list of diskIDs and latencies
  String getSlowDisksReport();


hadoop 源码目录


hadoop AclEntryStatusFormat 源码

hadoop AclFeature 源码

hadoop AclStorage 源码

hadoop AclTransformation 源码

hadoop AuditLogger 源码

hadoop BackupImage 源码

hadoop BackupJournalManager 源码

hadoop BackupNode 源码

hadoop BackupState 源码

hadoop CacheManager 源码

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