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

Inheritance diagram for JobQueueFederated:

Collaboration diagram for JobQueueFederated:

Public Member Functions
	getAllAbandonedJobs ()

	getAllAcquiredJobs ()

	getAllDelayedJobs ()

	getAllQueuedJobs ()

	getCoalesceLocationInternal ()

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

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

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

	delayedJobsEnabled ()

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

	flushCaches ()
	Clear any process and persistent caches. More...

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

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

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

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

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

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

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

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

	getOrder ()

	getReadOnlyReason ()

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

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

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

	getType ()

	getWiki ()

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

	pop ()
	Pop a job off of the queue. More...

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

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

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 ()

	supportedOrders ()

	supportsDelayedJobs ()

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

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

Protected Member Functions inherited from JobQueue
	__construct (array $params)

	assertNotReadOnly ()

	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 ()

	getRootJobCacheKey ($signature)

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

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

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

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

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

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

HashRing	$partitionRing

Protected Attributes inherited from JobQueue
JobQueueAggregator	$aggr

int	$claimTTL
	Time to live in seconds. More...

BagOStuff	$dupCache

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

string	$order
	Job priority for pop() More...

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

string	$type
	Job type. More...

string	$wiki
	Wiki ID. More...

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

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

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) accross 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 49 of file JobQueueFederated.php.

Constructor & Destructor Documentation

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

Definition at line 75 of file JobQueueFederated.php.

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