org.apache.hadoop.mapred

类 JobHistoryServer

java.lang.Object

org.apache.hadoop.mapred.JobHistoryServer

public class JobHistoryServer
extends Object

JobHistoryServer is responsible for servicing all job history related requests from client. History Server can be initialized in one of two modes * Emdedded within JobTracker * External daemon, can either be run on the job tracker node or outside Two Configuration entries in mapred-site.xml govern the functioning of the history server mapred.job.history.server.http.address is address to which history web server is bound to. If operating in embedded mode, the hostname on history address has to be same as the job tracker host name mapred.job.history.server.embedded (default is true) will cause job tracker to init history server, else the server need to be started as a separate daemon process

字段概要

字段

限定符和类型	字段和说明
static String	MAPRED_HISTORY_SERVER_EMBEDDED
static String	MAPRED_HISTORY_SERVER_HTTP_ADDRESS

构造器概要

构造器

构造器和说明
JobHistoryServer(JobConf conf) Starts job history server as a independent process * Initializes ACL Manager * Starts a webapp to service history requests
JobHistoryServer(JobConf conf, org.apache.hadoop.mapred.ACLsManager aclsManager, HttpServer httpServer) Starts job history server as a embedded server within job tracker * Starts a webapp to service history requests

方法概要

方法

限定符和类型	方法和说明
void	join()
static void	main(String[] args) Start job history server as an independent process
void	shutdown() Shutsdown the history server if already initialized
void	start()

从类继承的方法 java.lang.Object

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

字段详细资料

MAPRED_HISTORY_SERVER_HTTP_ADDRESS

public static final String MAPRED_HISTORY_SERVER_HTTP_ADDRESS

另请参阅:

常量字段值

MAPRED_HISTORY_SERVER_EMBEDDED

public static final String MAPRED_HISTORY_SERVER_EMBEDDED

另请参阅:

常量字段值

构造器详细资料

JobHistoryServer

public JobHistoryServer(JobConf conf)
                 throws IOException

Starts job history server as a independent process * Initializes ACL Manager * Starts a webapp to service history requests

参数:

conf - - Mr Cluster configuration

抛出:

IOException - - any exception starting history server

JobHistoryServer

public JobHistoryServer(JobConf conf,
                org.apache.hadoop.mapred.ACLsManager aclsManager,
                HttpServer httpServer)
                 throws IOException

Starts job history server as a embedded server within job tracker * Starts a webapp to service history requests

参数:

conf - - MR Cluster configuration

aclsManager - - ACLs Manager for user authentication

httpServer - - Http Server instance

抛出:

IOException - - any exception starting history server

方法详细资料

start

public void start()
           throws IOException

抛出:

IOException

join

public void join()
          throws InterruptedException

抛出:

InterruptedException

shutdown

public void shutdown()
              throws Exception

Shutsdown the history server if already initialized

抛出:

Exception - - Any exception during shutdown

main

public static void main(String[] args)

Start job history server as an independent process

参数:

args - - Command line arguments