Package org.apache.hadoop.hdfs.tools

Class JMXGet

java.lang.Object

org.apache.hadoop.hdfs.tools.JMXGet

@Private
public class JMXGet
extends java.lang.Object

tool to get data from NameNode or DataNode using MBeans currently the following MBeans are available (under hadoop domain): hadoop:service=NameNode,name=FSNamesystemState (static) hadoop:service=NameNode,name=NameNodeActivity (dynamic) hadoop:service=NameNode,name=RpcActivityForPort9000 (dynamic) hadoop:service=DataNode,name=RpcActivityForPort9867 (dynamic) hadoop:name=service=DataNode,FSDatasetState-UndefinedStorageId663800459 (static) hadoop:service=DataNode,name=DataNodeActivity-UndefinedStorageId-520845215 (dynamic) implementation note: all logging is sent to System.err (since it is a command line tool)

Constructor Summary

Constructors

Constructor	Description
JMXGet()

Method Summary

Modifier and Type	Method	Description
java.lang.String	getValue(java.lang.String key)	get single value by key
void	init()
static void	main(java.lang.String[] args)
void	printAllMatchedAttributes(java.lang.String attrRegExp)
void	printAllValues()	print all attributes' values
void	setLocalVMUrl(java.lang.String url)
void	setPort(java.lang.String port)
void	setServer(java.lang.String server)
void	setService(java.lang.String service)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JMXGet

public JMXGet()

Method Detail

setService

public void setService(java.lang.String service)

setPort

public void setPort(java.lang.String port)

setServer

public void setServer(java.lang.String server)

setLocalVMUrl

public void setLocalVMUrl(java.lang.String url)

printAllValues

public void printAllValues()
                    throws java.lang.Exception

print all attributes' values

Throws:

java.lang.Exception

printAllMatchedAttributes

public void printAllMatchedAttributes(java.lang.String attrRegExp)
                               throws java.lang.Exception

Throws:

java.lang.Exception

getValue

public java.lang.String getValue(java.lang.String key)
                          throws java.lang.Exception

get single value by key

Throws:

java.lang.Exception

init

public void init()
          throws java.lang.Exception

Throws:

java.lang.Exception - initializes MBeanServer

main

public static void main(java.lang.String[] args)