org.apache.oozie.service

Class JobsConcurrencyService

java.lang.Object

org.apache.oozie.service.JobsConcurrencyService

All Implemented Interfaces:

Service, Instrumentable

Direct Known Subclasses:

ZKJobsConcurrencyService

public class JobsConcurrencyService
extends Object
implements Service, Instrumentable

This Service helps coordinate other Services to prevent duplicate processing of Jobs if there are multiple Oozie Servers. This implementation assumes that there are NO other Oozie Servers (i.e. not HA). The ZKJobsConcurrencyService provides a more meaningful implementation.

Field Summary

Fields inherited from interface org.apache.oozie.service.Service

CONF_PREFIX, DEFAULT_LOCK_TIMEOUT, lockTimeout

Constructor Summary

Constructors

Constructor and Description
JobsConcurrencyService()

Method Summary

Modifier and Type	Method and Description
void	destroy() Destroy the jobs concurrency service.
Class<? extends Service>	getInterface() Return the public interface for the jobs concurrency services
List<String>	getJobIdsForThisServer(List<String> ids) Filter out any job ids that should not be processed by this server.
Map<String,String>	getOtherServerUrls() Return a map of instance id to other Oozie servers URL in HA.
Map<String,String>	getServerUrls() Return a map of instance id to Oozie server URL.
void	init(Services services) Initialize the jobs concurrency service
void	instrument(Instrumentation instr) Instruments the jobs concurrency service.
boolean	isAllServerRequest(Map<String,String[]> params) Checks if rest request is for all server.
boolean	isHighlyAvailableMode() Check if it is running in HA mode
boolean	isJobIdForThisServer(String jobId) Check to see if jobId should be processed by this server.
boolean	isLeader() Check to see if this server is the first server.

Methods inherited from class java.lang.Object

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

Constructor Detail

JobsConcurrencyService

public JobsConcurrencyService()

Method Detail

init

public void init(Services services)
          throws ServiceException

Initialize the jobs concurrency service

Specified by:

init in interface Service

Parameters:

services - services instance.

Throws:

ServiceException - thrown if the service could not initialize.

destroy

public void destroy()

Destroy the jobs concurrency service.

Specified by:

destroy in interface Service

getInterface

public Class<? extends Service> getInterface()

Return the public interface for the jobs concurrency services

Specified by:

getInterface in interface Service

Returns:

JobsConcurrencyService.

instrument

public void instrument(Instrumentation instr)

Instruments the jobs concurrency service.

Specified by:

instrument in interface Instrumentable

Parameters:

instr - instance to instrument the jobs concurrency service to.

isLeader

public boolean isLeader()

Check to see if this server is the first server. This implementation always returns true.

Returns:

true

isJobIdForThisServer

public boolean isJobIdForThisServer(String jobId)

Check to see if jobId should be processed by this server. This implementation always returns true.

Parameters:

jobId - The jobId to check

Returns:

true

getJobIdsForThisServer

public List<String> getJobIdsForThisServer(List<String> ids)

Filter out any job ids that should not be processed by this server. This implementation always returns an unmodified list.

Parameters:

ids - The list of job ids to check

Returns:

ids

getServerUrls

public Map<String,String> getServerUrls()

Return a map of instance id to Oozie server URL. This implementation always returns a map with a single entry where the key is the OOZIE_INSTANCE_ID env var and the value is the URL (of this Oozie server).

Returns:

A map of Oozie instance ids and URLs

getOtherServerUrls

public Map<String,String> getOtherServerUrls()

Return a map of instance id to other Oozie servers URL in HA. This implementation always returns a empty map.

Returns:

A map of Oozie instance ids and URLs

isAllServerRequest

public boolean isAllServerRequest(Map<String,String[]> params)

Checks if rest request is for all server. This function always return false;

Parameters:

params - the HttpRequest param

Returns:

false.

isHighlyAvailableMode

public boolean isHighlyAvailableMode()

Check if it is running in HA mode

Returns:

false