org.apache.hadoop.mapred
Class StatusHttpServer

java.lang.Object
  org.apache.hadoop.mapred.StatusHttpServer

public class StatusHttpServer
extends Object

Create a Jetty embedded server to answer http requests. The primary goal is to serve up status information for the server. There are three contexts: "/logs/" -> points to the log directory "/static/" -> points to common static files (src/webapps/static) "/" -> the jsp server code from (src/webapps/)

Author:

Owen O'Malley

Nested Class Summary

static class

StatusHttpServer.StackServlet A very simple servlet to serve up a text representation of the current stack traces.

Constructor Summary

StatusHttpServer(String name, String bindAddress, int port, boolean findPort)
Create a status server on the given port.

Method Summary

<T extends javax.servlet.http.HttpServlet> void	addServlet(String name, String pathSpec, Class<T> servletClass) Add a servlet in the server.
Object	getAttribute(String name) Get the value in the webapp context.
int	getPort() Get the port that the server is on
void	setAttribute(String name, Object value) Set a value in the webapp context.
void	setThreads(int min, int max)
void	start() Start the server.
void	stop() stop the server

Methods inherited from class java.lang.Object

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

Constructor Detail

StatusHttpServer

public StatusHttpServer(String name,
                        String bindAddress,
                        int port,
                        boolean findPort)
                 throws IOException

Create a status server on the given port. The jsp scripts are taken from src/webapps/.

Parameters:

name - The name of the server

port - The port to use on the server

findPort - whether the server should start at the given port and increment by 1 until it finds a free port.

Throws:

IOException

Method Detail

setAttribute

public void setAttribute(String name,
                         Object value)

Set a value in the webapp context. These values are available to the jsp pages as "application.getAttribute(name)".

Parameters:

name - The name of the attribute

value - The value of the attribute

addServlet

public <T extends javax.servlet.http.HttpServlet> void addServlet(String name,
                                                                  String pathSpec,
                                                                  Class<T> servletClass)

Add a servlet in the server.

Parameters:

name - The name of the servlet (can be passed as null)

pathSpec - The path spec for the servlet

servletClass - The servlet class

getAttribute

public Object getAttribute(String name)

Get the value in the webapp context.

Parameters:

name - The name of the attribute

Returns:

The value of the attribute

getPort

public int getPort()

Get the port that the server is on

Returns:

the port

setThreads

public void setThreads(int min,
                       int max)

start

public void start()
           throws IOException

Start the server. Does not wait for the server to start.

Throws:

IOException

stop

public void stop()
          throws InterruptedException

stop the server

Throws:

InterruptedException