hadoop NameNodeStatusMXBean 源码
haddop NameNodeStatusMXBean 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeStatusMXBean.java
/**
* 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* 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. *
*/
@InterfaceAudience.Private
@InterfaceStability.Stable
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();
}
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