org.apache.oozie.service

Class ZKUUIDService

java.lang.Object

org.apache.oozie.service.UUIDService

org.apache.oozie.service.ZKUUIDService

All Implemented Interfaces:

Service

public class ZKUUIDService
extends UUIDService

Service that provides distributed job id sequence via ZooKeeper. Requires that a ZooKeeper ensemble is available. The sequence path will be located under a ZNode named "job_id_sequence" under the namespace (see ZKUtils). The sequence will be reset to 0, once max is reached.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.oozie.service.UUIDService

UUIDService.ApplicationType

Field Summary

Fields

Modifier and Type	Field and Description
static String	CONF_PREFIX
static String	CONF_SEQUENCE_MAX
static ThreadLocal<SimpleDateFormat>	dt
static String	LOCKS_NODE
static long	RESET_VALUE
static int	RETRY_COUNT
static String	ZK_SEQUENCE_PATH

Fields inherited from class org.apache.oozie.service.UUIDService

CONF_GENERATOR, startTime

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

DEFAULT_LOCK_TIMEOUT, lockTimeout

Constructor Summary

Constructors

Constructor and Description
ZKUUIDService()

Method Summary

Methods

Modifier and Type	Method and Description
protected String	createSequence() Gets the unique id.
void	destroy() Destroy the UUID service.
String	getPromotedLock()
protected long	getZKSequence()
void	init(Services services) Initialize the UUID service.
void	setMaxSequence(long sequence)

Methods inherited from class org.apache.oozie.service.UUIDService

appendTimeToSequence, generateChildId, generateId, getChildName, getCounter, getId, getInterface, longPadding, resetStartTime

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 String CONF_PREFIX

See Also:

Constant Field Values

CONF_SEQUENCE_MAX

public static final String CONF_SEQUENCE_MAX

See Also:

Constant Field Values

LOCKS_NODE

public static final String LOCKS_NODE

See Also:

Constant Field Values

ZK_SEQUENCE_PATH

public static final String ZK_SEQUENCE_PATH

See Also:

Constant Field Values

RESET_VALUE

public static final long RESET_VALUE

See Also:

Constant Field Values

RETRY_COUNT

public static final int RETRY_COUNT

See Also:

Constant Field Values

dt

public static final ThreadLocal<SimpleDateFormat> dt

Constructor Detail

ZKUUIDService

public ZKUUIDService()

Method Detail

init

public void init(Services services)
          throws ServiceException

Description copied from class: UUIDService

Initialize the UUID service.

Specified by:

init in interface Service

Overrides:

init in class UUIDService

Parameters:

services - services instance.

Throws:

ServiceException - thrown if the UUID service could not be initialized.

createSequence

protected String createSequence()

Gets the unique id.

Overrides:

createSequence in class UUIDService

Returns:

the id

Throws:

Exception - the exception

getZKSequence

protected long getZKSequence()
                      throws Exception

Throws:

Exception

destroy

public void destroy()

Description copied from class: UUIDService

Destroy the UUID service.

Specified by:

destroy in interface Service

Overrides:

destroy in class UUIDService

getPromotedLock

public String getPromotedLock()

setMaxSequence

public void setMaxSequence(long sequence)