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

Inheritance diagram for JobQueueFederated:

Collaboration diagram for JobQueueFederated:

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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 (Job $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 ()
	Deleted 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).

	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 (Job $job)

	doBatchPush (array $jobs, $flags)

	doDeduplicateRootJob (IJobSpecification $job)

	doDelete ()

	doFlushCaches ()

	doGetAbandonedCount ()

	doGetAcquiredCount ()

	doGetDelayedCount ()

	doGetSiblingQueueSizes (array $types)

	doGetSiblingQueuesWithJobs (array $types)

	doGetSize ()

	doIsEmpty ()

	doIsRootJobOldDuplicate (Job $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 ()

	getRootJobCacheKey ( $signature)

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	Check if the "root" job of a given job has been superseded by a newer one.

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
JobQueueAggregator	$aggr

int	$claimTTL
	Time to live in seconds.

BagOStuff	$dupCache

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)

string	$type
	Job type.

string	$wiki
	Wiki ID.

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

static	incrStats ( $key, $type, $delta=1)
	Call wfIncrStats() for the queue overall and for the queue type.

Public Attributes inherited from JobQueue
const	QOS_ATOMIC = 1

const	ROOTJOB_TTL = 2419200

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 $params, $section, JobQueue\$wiki, and JobQueue\factory().

Member Function Documentation

◆ doAck()

JobQueueFederated::doAck ( Job $job )

protected

See also: JobQueue::ack()

Parameters

Job $job

Reimplemented from JobQueue.

Definition at line 307 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 181 of file JobQueueFederated.php.

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

◆ doDeduplicateRootJob()

JobQueueFederated::doDeduplicateRootJob ( IJobSpecification $job )

protected

See also: JobQueue::deduplicateRootJob()

Parameters

IJobSpecification $job

Exceptions

MWException

Returns: bool

Reimplemented from JobQueue.

Definition at line 330 of file JobQueueFederated.php.

References $e, and $job.

◆ doDelete()

JobQueueFederated::doDelete ( )

protected

See also: JobQueue::delete()

Exceptions

MWException

Reimplemented from JobQueue.

Definition at line 345 of file JobQueueFederated.php.

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

◆ doFlushCaches()

JobQueueFederated::doFlushCaches ( )

protected

See also: JobQueue::flushCaches()

Returns: void

Reimplemented from JobQueue.

Definition at line 374 of file JobQueueFederated.php.

References $queue.

◆ doGetAbandonedCount()

JobQueueFederated::doGetAbandonedCount ( )

protected

See also: JobQueue::getAbandonedCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 156 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doGetAcquiredCount()

JobQueueFederated::doGetAcquiredCount ( )

protected

See also: JobQueue::getAcquiredCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 148 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doGetDelayedCount()

JobQueueFederated::doGetDelayedCount ( )

protected

See also: JobQueue::getDelayedCount()

Returns: int

Reimplemented from JobQueue.

Definition at line 152 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doGetSiblingQueueSizes()

JobQueueFederated::doGetSiblingQueueSizes ( array $types )

protected

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 456 of file JobQueueFederated.php.

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

◆ doGetSiblingQueuesWithJobs()

JobQueueFederated::doGetSiblingQueuesWithJobs ( array $types )

protected

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 430 of file JobQueueFederated.php.

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

◆ doGetSize()

JobQueueFederated::doGetSize ( )

protected

See also: JobQueue::getSize()

Returns: int

Reimplemented from JobQueue.

Definition at line 144 of file JobQueueFederated.php.

References getCrossPartitionSum().

◆ doIsEmpty()

JobQueueFederated::doIsEmpty ( )

protected

See also: JobQueue::isEmpty()

Returns: bool

Reimplemented from JobQueue.

Definition at line 128 of file JobQueueFederated.php.

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

◆ doIsRootJobOldDuplicate()

JobQueueFederated::doIsRootJobOldDuplicate ( Job $job )

protected

See also: JobQueue::isRootJobOldDuplicate()

Parameters

Job $job

Returns: bool

Reimplemented from JobQueue.

Definition at line 315 of file JobQueueFederated.php.

References $e, and $job.

◆ doPop()

JobQueueFederated::doPop ( )

protected

See also: JobQueue::pop()

Returns: Job|bool

Reimplemented from JobQueue.

Definition at line 275 of file JobQueueFederated.php.

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

◆ doWaitForBackups()

JobQueueFederated::doWaitForBackups ( )

protected

See also: JobQueue::waitForBackups()

Returns: void

Reimplemented from JobQueue.

Definition at line 360 of file JobQueueFederated.php.

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

◆ getAllAbandonedJobs()

JobQueueFederated::getAllAbandonedJobs ( )

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

Returns: Iterator

Exceptions

JobQueueError

Since: 1.25

Reimplemented from JobQueue.

Definition at line 414 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

Returns: Iterator

Exceptions

JobQueueError

Since: 1.26

Reimplemented from JobQueue.

Definition at line 403 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.

Returns: Iterator

Exceptions

JobQueueError

Since: 1.22

Reimplemented from JobQueue.

Definition at line 392 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 381 of file JobQueueFederated.php.

References $queue.

◆ getCoalesceLocationInternal()

JobQueueFederated::getCoalesceLocationInternal ( )

Do not use this function outside of JobQueue/JobQueueGroup.

Returns: string

Since: 1.22

Reimplemented from JobQueue.

Definition at line 425 of file JobQueueFederated.php.

References serialize().

◆ getCrossPartitionSum()

JobQueueFederated::getCrossPartitionSum	(		$type,
			$method )

protected

Parameters

string	$type
string	$method

Returns: int

Definition at line 165 of file JobQueueFederated.php.

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

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

◆ logException()

JobQueueFederated::logException ( Exception $e )

protected

Definition at line 480 of file JobQueueFederated.php.

References $e, and 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 114 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 109 of file JobQueueFederated.php.

◆ supportsDelayedJobs()

JobQueueFederated::supportsDelayedJobs ( )

protected

Find out if delayed jobs are supported for configuration validation.

Returns: bool Whether delayed jobs are supported

Reimplemented from JobQueue.

Definition at line 118 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 491 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: array List of Job object that could not be inserted

Definition at line 209 of file JobQueueFederated.php.

References $e, $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