Package org.apache.hadoop.hdfs.tools.offlineImageViewer

Class WebImageViewer

java.lang.Object

org.apache.hadoop.hdfs.tools.offlineImageViewer.WebImageViewer

All Implemented Interfaces:

Closeable, AutoCloseable

public class WebImageViewer
extends Object
implements Closeable

WebImageViewer loads a fsimage and exposes read-only WebHDFS API for its namespace.

Field Summary

Fields

Modifier and Type	Field	Description
static final org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor	Description
WebImageViewer(InetSocketAddress address)
WebImageViewer(InetSocketAddress address, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method	Description
void	close()
int	getPort()	Get the listening port.
void	initServer(String fsimage)	Start WebImageViewer.
void	start(String fsimage)	Start WebImageViewer and wait until the thread is interrupted.

Methods inherited from class java.lang.Object

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

Field Details

LOG

public static final org.slf4j.Logger LOG

Constructor Details

WebImageViewer

public WebImageViewer(InetSocketAddress address)

WebImageViewer

public WebImageViewer(InetSocketAddress address,
 org.apache.hadoop.conf.Configuration conf)

Method Details

start

public void start(String fsimage)
           throws IOException

Start WebImageViewer and wait until the thread is interrupted.

Parameters:

fsimage - the fsimage to load.

Throws:

IOException - if failed to load the fsimage.

RuntimeException - if security is enabled in configuration.

initServer

@VisibleForTesting
public void initServer(String fsimage)
                throws IOException,
InterruptedException

Start WebImageViewer.

Parameters:

fsimage - the fsimage to load.

Throws:

IOException - if fail to load the fsimage.

InterruptedException

getPort

@VisibleForTesting
public int getPort()

Get the listening port.

Returns:

the port WebImageViewer is listening on

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable