org.apache.oozie.service

Class JvmPauseMonitorService

java.lang.Object

org.apache.oozie.service.JvmPauseMonitorService

All Implemented Interfaces:

Service

public class JvmPauseMonitorService
extends java.lang.Object
implements Service

This class sets up a simple thread that sleeps for a short period of time. If the sleep takes significantly longer than its target time, it implies that the JVM or host machine has paused processing, which may cause other problems. If such a pause is detected, the thread logs a message and updates the Instrumentation. Adapted from org.apache.hadoop.util.JvmPauseMonitor

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CONF_PREFIX
static java.lang.String	INFO_THRESHOLD_KEY
static java.lang.String	WARN_THRESHOLD_KEY

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

DEFAULT_LOCK_TIMEOUT, lockTimeout

Constructor Summary

Constructors

Constructor and Description
JvmPauseMonitorService()

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Destroy the service.
java.lang.Class<? extends Service>	getInterface() Return the public interface of the service.
void	init(Services services) Initialize the service.

Methods inherited from class java.lang.Object

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

Field Detail

CONF_PREFIX

public static final java.lang.String CONF_PREFIX

See Also:

Constant Field Values

WARN_THRESHOLD_KEY

public static final java.lang.String WARN_THRESHOLD_KEY

See Also:

Constant Field Values

INFO_THRESHOLD_KEY

public static final java.lang.String INFO_THRESHOLD_KEY

See Also:

Constant Field Values

Constructor Detail

JvmPauseMonitorService

public JvmPauseMonitorService()

Method Detail

init

public void init(Services services)
          throws ServiceException

Description copied from interface: Service

Initialize the service.

Invoked by the Service singleton at start up time.

Specified by:

init in interface Service

Parameters:

services - services singleton initializing the service.

Throws:

ServiceException - thrown if the service could not initialize.

destroy

public void destroy()

Description copied from interface: Service

Destroy the service.

Invoked by the Service singleton at shutdown time.

Specified by:

destroy in interface Service

getInterface

public java.lang.Class<? extends Service> getInterface()

Description copied from interface: Service

Return the public interface of the service.

Services are retrieved by its public interface. Specializations of services must return the public interface.

Specified by:

getInterface in interface Service

Returns:

the interface of the service.