Class to handle enqueueing and running of background jobs for federated queues. More...

Inheritance diagram for JobQueueFederated:

Collaboration diagram for JobQueueFederated:

[legend]

Public Member Functions
	getAllAbandonedJobs ()
	Get an iterator to traverse over all abandoned jobs in this queue.

	getAllAcquiredJobs ()
	Get an iterator to traverse over all claimed jobs in this queue.

	getAllDelayedJobs ()
	Get an iterator to traverse over all delayed jobs in this queue.

	getAllQueuedJobs ()
	Get an iterator to traverse over all available jobs in this queue.

	getCoalesceLocationInternal ()
	Do not use this function outside of JobQueue/JobQueueGroup.

Public Member Functions inherited from JobQueue
	ack (RunnableJob $job)
	Acknowledge that a job was completed.

	batchPush (array $jobs, $flags=0)
	Push a batch of jobs into the queue.

	deduplicateRootJob (IJobSpecification $job)
	Register the "root job" of a given job into the queue for de-duplication.

	delayedJobsEnabled ()

	delete ()
	Delete all unclaimed and delayed jobs from the queue.

	flushCaches ()
	Clear any process and persistent caches.

	getAbandonedCount ()
	Get the number of acquired jobs that can no longer be attempted.

	getAcquiredCount ()
	Get the number of acquired jobs (these are temporarily out of the queue).

	getDelayedCount ()
	Get the number of delayed jobs (these are temporarily out of the queue).

	getDomain ()

	getOrder ()

	getReadOnlyReason ()

	getSiblingQueueSizes (array $types)
	Check the size of each of the given queues.

	getSiblingQueuesWithJobs (array $types)
	Check whether each of the given queues are empty.

	getSize ()
	Get the number of available (unacquired, non-delayed) jobs in the queue.

	getType ()

	getWiki ()

	isEmpty ()
	Quickly check if the queue has no available (unacquired, non-delayed) jobs.

	pop ()
	Pop a job off of the queue.

	push ( $jobs, $flags=0)
	Push one or more jobs into the queue.

	waitForBackups ()
	Wait for any replica DBs or backup servers to catch up.

Protected Member Functions
	__construct (array $params)

	doAck (RunnableJob $job)

	doBatchPush (array $jobs, $flags)

	doDeduplicateRootJob (IJobSpecification $job)

	doDelete ()

	doFlushCaches ()

	doGetAbandonedCount ()

	doGetAcquiredCount ()

	doGetDelayedCount ()

	doGetSiblingQueueSizes (array $types)

	doGetSiblingQueuesWithJobs (array $types)

	doGetSize ()

	doIsEmpty ()

	doIsRootJobOldDuplicate (IJobSpecification $job)

	doPop ()

	doWaitForBackups ()

	getCrossPartitionSum ( $type, $method)

	logException (Exception $e)

	optimalOrder ()
	Get the default queue order to use if configuration does not specify one.

	supportedOrders ()
	Get the allowed queue orders for configuration validation.

	supportsDelayedJobs ()
	Find out if delayed jobs are supported for configuration validation.

	throwErrorIfAllPartitionsDown ( $down)
	Throw an error if no partitions available.

	tryJobInsertions (array $jobs, HashRing &$partitionRing, $flags)

Protected Member Functions inherited from JobQueue
	assertNotReadOnly ()

	factoryJob ( $command, $params)

	getRootJobCacheKey ( $signature, $type)

	incrStats ( $key, $type, $delta=1)
	Call StatsdDataFactoryInterface::updateCount() for the queue overall and for the queue type.

	isRootJobOldDuplicate (IJobSpecification $job)
	Check if the "root" job of a given job has been superseded by a newer one.

	supportsTypeAgnostic ()
	Subclasses should set this to true if they support type agnostic queues.

Protected Attributes
int	$maxPartitionsTry
	Maximum number of partitions to try.

JobQueue[]	$partitionQueues = []
	(partition name => JobQueue) reverse sorted by weight

HashRing	$partitionRing

Protected Attributes inherited from JobQueue
int	$claimTTL
	Time to live in seconds.

string	$domain
	DB domain ID.

GlobalIdGenerator	$idGenerator

int	$maxTries
	Maximum number of times to try a job.

string	$order
	Job priority for pop()

string bool	$readOnlyReason
	Read only rationale (or false if r/w)

StatsdDataFactoryInterface	$stats

string	$type
	Job type.

bool	$typeAgnostic

WANObjectCache	$wanCache

const	QOS_ATOMIC = 1

const	ROOTJOB_TTL = 2419200

Additional Inherited Members
Static Public Member Functions inherited from JobQueue
static	factory (array $params)
	Get a job queue object of the specified type.

Detailed Description

Class to handle enqueueing and running of background jobs for federated queues.

This class allows for queues to be partitioned into smaller queues. A partition is defined by the configuration for a JobQueue instance. For example, one can set $wgJobTypeConf['refreshLinks'] to point to a JobQueueFederated instance, which itself would consist of three JobQueueRedis instances, each using their own redis server. This would allow for the jobs to be split (evenly or based on weights) across multiple servers if a single server becomes impractical or expensive. Different JobQueue classes can be mixed.

The basic queue configuration (e.g. "order", "claimTTL") of a federated queue is inherited by the partition queues. Additional configuration defines what section each wiki is in, what partition queues each section uses (and their weight), and the JobQueue configuration for each partition. Some sections might only need a single queue partition, like the sections for groups of small wikis.

If used for performance, then $wgMainCacheType should be set to memcached/redis. Note that "fifo" cannot be used for the ordering, since the data is distributed. One can still use "timestamp" instead, as in "roughly timestamp ordered". Also, queue classes used by this should ignore down servers (with TTL) to avoid slowness.

Since: 1.22

Definition at line 48 of file JobQueueFederated.php.

Constructor & Destructor Documentation

◆ __construct()

JobQueueFederated::__construct ( array $params )

protected

Parameters

array

$params

Possible keys:

sectionsByWiki : A map of wiki IDs to section names. Wikis will default to using the section "default".
partitionsBySection : Map of section names to maps of (partition name => weight). A section called 'default' must be defined if not all wikis have explicitly defined sections.
configByPartition : Map of queue partition names to configuration arrays. These configuration arrays are passed to JobQueue::factory(). The options set here are overridden by those passed to this the federated queue itself (e.g. 'order' and 'claimTTL').
maxPartitionsTry : Maximum number of times to attempt job insertion using different partition queues. This improves availability during failure, at the cost of added latency and somewhat less reliable job de-duplication mechanisms.

Exceptions

MWException

Reimplemented from JobQueue.

Definition at line 74 of file JobQueueFederated.php.

References JobQueue\$domain, and JobQueue\factory().

Member Function Documentation

◆ doAck()

JobQueueFederated::doAck ( RunnableJob $job )

protected

See also: JobQueue::ack()

Parameters

RunnableJob $job

Reimplemented from JobQueue.

Definition at line 300 of file JobQueueFederated.php.

References $job.

◆ doBatchPush()

JobQueueFederated::doBatchPush	(	array	$jobs,
			$flags )

protected

See also: JobQueue::batchPush()

Parameters

IJobSpecification[]	$jobs
int	$flags

Reimplemented from JobQueue.

Definition at line 175 of file JobQueueFederated.php.

References $partitionRing, HashRing\getLiveLocationWeights(), and tryJobInsertions().

◆ doDeduplicateRootJob()

JobQueueFederated::doDeduplicateRootJob ( IJobSpecification $job )

protected

Stability: stable: to override

See also: JobQueue::deduplicateRootJob()

Parameters

IJobSpecification $job

Exceptions

JobQueueError

Returns: bool

Reimplemented from JobQueue.

Definition at line 324 of file JobQueueFederated.php.

References $job.

◆ doDelete()

JobQueueFederated::doDelete ( )

protected

Stability: stable: to override

See also: JobQueue::delete()

Exceptions

JobQueueError

Reimplemented from JobQueue.

Definition at line 339 of file JobQueueFederated.php.

References $queue, logException(), and throwErrorIfAllPartitionsDown().

◆ doFlushCaches()

JobQueueFederated::doFlushCaches ( )

protected

Stability: stable: to override

See also: JobQueue::flushCaches()

Returns: void

Reimplemented from JobQueue.

Definition at line 368 of file JobQueueFederated.php.

References $queue.

◆ doGetAbandonedCount()

JobQueueFederated::doGetAbandonedCount ( )

protected

Stability: stable: to override

See also: JobQueue::getAbandonedCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 150 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doGetAcquiredCount()

JobQueueFederated::doGetAcquiredCount ( )

protected

See also: JobQueue::getAcquiredCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 142 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doGetDelayedCount()

JobQueueFederated::doGetDelayedCount ( )

protected

Stability: stable: to override

See also: JobQueue::getDelayedCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 146 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doGetSiblingQueueSizes()

JobQueueFederated::doGetSiblingQueueSizes ( array $types )

protected

Stability: stable: to override

See also: JobQueue::getSiblingQueuesSize()

Parameters

array $types List of queues types

Returns: array|null (list of queue types) or null if unsupported

Reimplemented from JobQueue.

Definition at line 450 of file JobQueueFederated.php.

References $queue, JobQueue\$type, logException(), and throwErrorIfAllPartitionsDown().

◆ doGetSiblingQueuesWithJobs()

JobQueueFederated::doGetSiblingQueuesWithJobs ( array $types )

protected

Stability: stable: to override

See also: JobQueue::getSiblingQueuesWithJobs()

Parameters

array $types List of queues types

Returns: array|null (list of queue types) or null if unsupported

Reimplemented from JobQueue.

Definition at line 424 of file JobQueueFederated.php.

References $queue, logException(), and throwErrorIfAllPartitionsDown().

◆ doGetSize()

JobQueueFederated::doGetSize ( )

protected

See also: JobQueue::getSize()

Returns: int

Reimplemented from JobQueue.

Definition at line 138 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doIsEmpty()

JobQueueFederated::doIsEmpty ( )

protected

See also: JobQueue::isEmpty()

Returns: bool

Reimplemented from JobQueue.

Definition at line 122 of file JobQueueFederated.php.

References $queue, logException(), and throwErrorIfAllPartitionsDown().

◆ doIsRootJobOldDuplicate()

JobQueueFederated::doIsRootJobOldDuplicate ( IJobSpecification $job )

protected

Stability: stable: to override

See also: JobQueue::isRootJobOldDuplicate()

Parameters

IJobSpecification $job

Returns: bool

Reimplemented from JobQueue.

Definition at line 309 of file JobQueueFederated.php.

References $job.

◆ doPop()

JobQueueFederated::doPop ( )

protected

See also: JobQueue::pop()

Returns: RunnableJob|bool

Reimplemented from JobQueue.

Definition at line 268 of file JobQueueFederated.php.

References $job, $queue, logException(), and throwErrorIfAllPartitionsDown().

◆ doWaitForBackups()

JobQueueFederated::doWaitForBackups ( )

protected

Stability: stable: to override

See also: JobQueue::waitForBackups()

Returns: void

Reimplemented from JobQueue.

Definition at line 354 of file JobQueueFederated.php.

References $queue, logException(), and throwErrorIfAllPartitionsDown().

◆ getAllAbandonedJobs()

JobQueueFederated::getAllAbandonedJobs ( )

Get an iterator to traverse over all abandoned jobs in this queue.

Stability: stable: to override

Returns: Iterator

Exceptions

JobQueueError

Since: 1.25

Reimplemented from JobQueue.

Definition at line 408 of file JobQueueFederated.php.

References $queue.

◆ getAllAcquiredJobs()

JobQueueFederated::getAllAcquiredJobs ( )

Get an iterator to traverse over all claimed jobs in this queue.

Callers should be quick to iterator over it or few results will be returned due to jobs being acknowledged and deleted

Stability: stable: to override

Returns: Iterator

Exceptions

JobQueueError

Since: 1.26

Reimplemented from JobQueue.

Definition at line 397 of file JobQueueFederated.php.

References $queue.

◆ getAllDelayedJobs()

JobQueueFederated::getAllDelayedJobs ( )

Get an iterator to traverse over all delayed jobs in this queue.

Note: results may be stale if the queue is concurrently modified.

Stability: stable: to override

Returns: Iterator

Exceptions

JobQueueError

Since: 1.22

Reimplemented from JobQueue.

Definition at line 386 of file JobQueueFederated.php.

References $queue.

◆ getAllQueuedJobs()

JobQueueFederated::getAllQueuedJobs ( )

Get an iterator to traverse over all available jobs in this queue.

This does not include jobs that are currently acquired or delayed. Note: results may be stale if the queue is concurrently modified.

Returns: Iterator

Exceptions

JobQueueError

Reimplemented from JobQueue.

Definition at line 375 of file JobQueueFederated.php.

References $queue.

◆ getCoalesceLocationInternal()

JobQueueFederated::getCoalesceLocationInternal ( )

Do not use this function outside of JobQueue/JobQueueGroup.

Stability: stable: to override

Returns: string|null

Since: 1.22

Reimplemented from JobQueue.

Definition at line 419 of file JobQueueFederated.php.

References serialize().

◆ getCrossPartitionSum()

JobQueueFederated::getCrossPartitionSum	(		$type,
			$method )

protected

Parameters

string	$type
string	$method

Returns: int

Definition at line 159 of file JobQueueFederated.php.

References $queue, logException(), and throwErrorIfAllPartitionsDown().

Referenced by doGetAbandonedCount(), doGetAcquiredCount(), doGetDelayedCount(), and doGetSize().

◆ logException()

JobQueueFederated::logException ( Exception $e )

protected

Definition at line 474 of file JobQueueFederated.php.

References wfDebugLog().

Referenced by doDelete(), doGetSiblingQueueSizes(), doGetSiblingQueuesWithJobs(), doIsEmpty(), doPop(), doWaitForBackups(), getCrossPartitionSum(), and tryJobInsertions().

◆ optimalOrder()

JobQueueFederated::optimalOrder ( )

protected

Get the default queue order to use if configuration does not specify one.

Returns: string One of (random, timestamp, fifo, undefined)

Reimplemented from JobQueue.

Definition at line 108 of file JobQueueFederated.php.

◆ supportedOrders()

JobQueueFederated::supportedOrders ( )

protected

Get the allowed queue orders for configuration validation.

Returns: array Subset of (random, timestamp, fifo, undefined)

Reimplemented from JobQueue.

Definition at line 103 of file JobQueueFederated.php.

◆ supportsDelayedJobs()

JobQueueFederated::supportsDelayedJobs ( )

protected

Find out if delayed jobs are supported for configuration validation.

Stability: stable: to override

Returns: bool Whether delayed jobs are supported

Reimplemented from JobQueue.

Definition at line 112 of file JobQueueFederated.php.

References $queue.

◆ throwErrorIfAllPartitionsDown()

JobQueueFederated::throwErrorIfAllPartitionsDown ( $down )

protected

Throw an error if no partitions available.

Parameters

int $down The number of up partitions down

Returns: void

Exceptions

JobQueueError

Definition at line 485 of file JobQueueFederated.php.

Referenced by doDelete(), doGetSiblingQueueSizes(), doGetSiblingQueuesWithJobs(), doIsEmpty(), doPop(), doWaitForBackups(), and getCrossPartitionSum().

◆ tryJobInsertions()

JobQueueFederated::tryJobInsertions	(	array	$jobs,
		HashRing &	$partitionRing,
			$flags )

protected

Parameters

array	$jobs
HashRing	&$partitionRing
int	$flags

Exceptions

JobQueueError

Returns: IJobSpecification[] List of Job object that could not be inserted

Definition at line 202 of file JobQueueFederated.php.

References $job, $partitionRing, $queue, HashRing\ejectFromLiveRing(), HashRing\getLiveLocation(), HashRing\getLiveLocationWeights(), logException(), and serialize().

Referenced by doBatchPush().

Member Data Documentation

◆ $maxPartitionsTry

int JobQueueFederated::$maxPartitionsTry

protected

Maximum number of partitions to try.

Definition at line 55 of file JobQueueFederated.php.

◆ $partitionQueues

JobQueue [] JobQueueFederated::$partitionQueues = []

protected

(partition name => JobQueue) reverse sorted by weight

Definition at line 52 of file JobQueueFederated.php.

◆ $partitionRing

HashRing JobQueueFederated::$partitionRing

protected

Definition at line 50 of file JobQueueFederated.php.

Referenced by doBatchPush(), and tryJobInsertions().

The documentation for this class was generated from the following file:

includes/jobqueue/JobQueueFederated.php

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ doAck()

◆ doBatchPush()

◆ doDeduplicateRootJob()

◆ doDelete()

◆ doFlushCaches()

◆ doGetAbandonedCount()

◆ doGetAcquiredCount()

◆ doGetDelayedCount()

◆ doGetSiblingQueueSizes()

◆ doGetSiblingQueuesWithJobs()

◆ doGetSize()

◆ doIsEmpty()

◆ doIsRootJobOldDuplicate()

◆ doPop()

◆ doWaitForBackups()

◆ getAllAbandonedJobs()

◆ getAllAcquiredJobs()

◆ getAllDelayedJobs()

◆ getAllQueuedJobs()

◆ getCoalesceLocationInternal()

◆ getCrossPartitionSum()

◆ logException()

◆ optimalOrder()

◆ supportedOrders()

◆ supportsDelayedJobs()

◆ throwErrorIfAllPartitionsDown()

◆ tryJobInsertions()

Member Data Documentation

◆ $maxPartitionsTry

◆ $partitionQueues

◆ $partitionRing