Advanced manager for multiple database sections, e.g. More...

Inheritance diagram for Wikimedia\Rdbms\LBFactoryMulti:

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Collaboration diagram for Wikimedia\Rdbms\LBFactoryMulti:

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Public Member Functions
	__construct (array $conf)
	Template override precedence (highest => lowest):

	forEachLB ( $callback, array $params=[])
	Execute a function for each instantiated tracked load balancer instance.

	getAllExternalLBs ()
	Get the tracked load balancer instances for all external clusters.

	getAllMainLBs ()
	Get the tracked load balancer instances for all main clusters.

	getExternalLB ( $cluster)
	Get the tracked load balancer instance for an external cluster.

	getMainLB ( $domain=false)
	Get the tracked load balancer instance for the main cluster that handles the given domain.

	newExternalLB ( $cluster)
	Create a new load balancer instance for an external cluster.

	newMainLB ( $domain=false)
	Create a new load balancer instance for the main cluster that handles the given domain.

Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
	appendShutdownCPIndexAsQuery ( $url, $index)
	Append ?cpPosIndex parameter to a URL for ChronologyProtector purposes if needed.

	autoReconfigure ()
	Reload config using the callback passed defined $config['configCallback'].

	beginPrimaryChanges ( $fname=__METHOD__)
	Flush any primary transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set)

	closeAll ( $fname=__METHOD__)
	Close all connections on instantiated tracked load balancer instances.

	commitAll ( $fname=__METHOD__, array $options=[])
	Commit open transactions on all connections.

	commitAndWaitForReplication ( $fname, $ticket, array $opts=[])
	Call commitPrimaryChanges() and waitForReplication() if $ticket indicates it is safe.

	commitPrimaryChanges ( $fname=__METHOD__, array $options=[])
	Commit changes and clear view snapshots on all primary connections.

	destroy ()
	Close all connections and make further attempts to open connections result in DBAccessError.

	disableChronologyProtection ()
	Disable the ChronologyProtector on all instantiated tracked load balancer instances.

	flushPrimarySessions ( $fname=__METHOD__)
	Release important session-level state (named lock, table locks) as post-rollback cleanup.

	flushReplicaSnapshots ( $fname=__METHOD__)
	Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshot.

	getAllLBs ()
	Get all tracked load balancer instances (generator)

	getChronologyProtectorClientId ()
	Get the client ID of the ChronologyProtector instance.

	getChronologyProtectorTouched ( $domain=false)
	Get the UNIX timestamp when the client last touched the DB, if they did so recently.

	getEmptyTransactionTicket ( $fname)
	Get a token asserting that no transaction writes are active on tracked load balancers.

	getLocalDomainID ()
	Get the local (and default) database domain ID of connection handles.

	getTransactionProfiler ()
	Get the TransactionProfiler used by this instance.

	hasOrMadeRecentPrimaryChanges ( $age=null)
	Determine if any primary connection has pending/written changes from this request.

	hasPrimaryChanges ()
	Determine if any primary connection has pending changes.

	hasTransactionRound ()
	Check if an explicit transaction round is active.

	isReadyForRoundOperations ()
	Check if transaction rounds can be started, committed, or rolled back right now.

	laggedReplicaUsed ()
	Determine if any lagged replica DB connection was used.

	reconfigure (array $conf)
	Reconfigure using the given config array.

	redefineLocalDomain ( $domain)
	Close all connections and redefine the local database domain.

	resolveDomainID ( $domain)

	rollbackPrimaryChanges ( $fname=__METHOD__)
	Rollback changes on all primary connections.

	setAgentName ( $agent)

	setDefaultReplicationWaitTimeout ( $seconds)
	Set the default timeout for replication wait checks.

	setDomainAliases (array $aliases)
	Convert certain database domains to alternative ones.

	setIndexAliases (array $aliases)
	Convert certain index names to alternative names before querying the DB.

	setLocalDomainPrefix ( $prefix)
	Set a new table prefix for the existing local domain ID for testing.

	setMockTime (&$time)

	setRequestInfo (array $info)
	Inject HTTP request header/cookie information during setup of this instance.

	setTableAliases (array $aliases)
	Make certain table names use their own database, schema, and table prefix when passed into SQL queries pre-escaped and without a qualified database name.

	setWaitForReplicationListener ( $name, callable $callback=null)
	Add a callback to be run in every call to waitForReplication() before waiting.

	shutdown ( $flags=self::SHUTDOWN_NORMAL, callable $workCallback=null, &$cpIndex=null, &$cpClientId=null)
	Prepare all instantiated tracked load balancer instances for shutdown.

	waitForReplication (array $opts=[])
	Waits for the replica DBs to catch up to the current primary position.

Protected Member Functions
	getLBsForOwner ()
	Get all tracked load balancers with the internal "for owner" interface.

Protected Member Functions inherited from Wikimedia\Rdbms\LBFactory
	baseLoadBalancerParams ()
	Get parameters to ILoadBalancer::__construct()

	configure (array $conf)

	getChronologyProtector ()

	initLoadBalancer (ILoadBalancerForOwner $lb)

	resolveDomainInstance ( $domain)

	shutdownChronologyProtector (ChronologyProtector $cp, &$cpIndex=null)
	Get and record all of the staged DB positions into persistent memory storage.

Additional Inherited Members
Static Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
static	getCPInfoFromCookieValue (?string $value, int $minTimestamp)
	Parse a string conveying the client and write index of the chronology protector data.

static	makeCookieValueFromCPIndex (int $writeIndex, int $time, string $clientId)
	Build a string conveying the client and write index of the chronology protector data.

Public Attributes inherited from Wikimedia\Rdbms\ILBFactory
const	SHUTDOWN_NO_CHRONPROT = 1
	Do not save "session consistency" DB replication positions.

const	SHUTDOWN_NORMAL = 0
	Idiom for "no special shutdown flags".

Protected Attributes inherited from Wikimedia\Rdbms\LBFactory
BagOStuff	$cpStash

DatabaseFactory	$databaseFactory

DatabaseDomain	$localDomain
	Local domain.

int null	$maxLag

string false	$readOnlyReason = false
	Reason all LBs are read-only or false if not.

BagOStuff	$srvCache

WANObjectCache	$wanCache

Detailed Description

Advanced manager for multiple database sections, e.g.

for large wiki farms.

This means different wikis can be stored on different database servers. It includes support for multi-primary setups.

Definition at line 34 of file LBFactoryMulti.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\LBFactoryMulti::__construct ( array $conf )

Template override precedence (highest => lowest):

templateOverridesByServer
masterTemplateOverrides
templateOverridesBySection/templateOverridesByCluster
externalTemplateOverrides
serverTemplate Overrides only work on top level keys (so nested values will not be merged).

Server config maps should be of the format Database::factory() requires. Additionally, a 'max lag' key should also be set on server maps, indicating how stale the data can be before the load balancer tries to avoid using it. The map can have 'is static' set to disable blocking replication sync checks (intended for archive servers with unchanging data).

See also: LBFactory::__construct()

Parameters

array

$conf

Additional parameters include:

hostsByName: map of (server name => IP address). [optional]
sectionsByDB: map of (database => main section). The database name "DEFAULT" is interpreted as a catch-all for all databases not otherwise mentioned. [optional]
sectionLoads: map of (main section => server name => load ratio); the first host listed in each section is the primary DB server for that section. [optional]
groupLoadsBySection: map of (main section => group => server name => group load ratio). Any ILoadBalancer::GROUP_GENERIC group will be ignored. [optional]
externalLoads: map of (cluster => server name => load ratio) map. [optional]
serverTemplate: server config map for Database::factory(). Note that "host", "serverName" and "load" entries will be overridden by "groupLoadsBySection" and "hostsByName". [optional]
externalTemplateOverrides: server config map overrides for external stores; respects the override precedence described above. [optional]
templateOverridesBySection: map of (main section => server config map overrides); respects the override precedence described above. [optional]
templateOverridesByCluster: map of (external cluster => server config map overrides); respects the override precedence described above. [optional]
masterTemplateOverrides: server config map overrides for masters; respects the override precedence described above. [optional]
templateOverridesByServer: map of (server name => server config map overrides); respects the override precedence described above and applies to both core and external storage. [optional]
loadMonitor: LoadMonitor::__construct() parameters with "class" field. [optional]
readOnlyBySection: map of (main section => message text or false). String values make sections read only, whereas anything else does not restrict read/write mode. [optional]
configCallback: A callback that returns a conf array that can be passed to the reconfigure() method. This will be used to autoReconfigure() to load any updated configuration.

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 112 of file LBFactoryMulti.php.

References Wikimedia\Rdbms\ILoadBalancer\GROUP_GENERIC.

Member Function Documentation

◆ forEachLB()

Wikimedia\Rdbms\LBFactoryMulti::forEachLB	(		$callback,
		array	$params = [] )

Execute a function for each instantiated tracked load balancer instance.

The callback is called with the load balancer as the first parameter, and $params passed as the subsequent parameters.

Deprecated: since 1.39 use getAllLBs()

Parameters

callable	$callback
array	$params

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 227 of file LBFactoryMulti.php.

References wfDeprecated().

◆ getAllExternalLBs()

Wikimedia\Rdbms\LBFactoryMulti::getAllExternalLBs ( )

Get the tracked load balancer instances for all external clusters.

If no tracked instance exists for a cluster, then one will be instantiated

Returns: ILoadBalancer[] Map of (cluster name => ILoadBalancer)

Since: 1.29

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 218 of file LBFactoryMulti.php.

◆ getAllMainLBs()

Wikimedia\Rdbms\LBFactoryMulti::getAllMainLBs ( )

Get the tracked load balancer instances for all main clusters.

If no tracked instance exists for a cluster, then one will be instantiated

Note that default main cluster name is ILoadBalancer::CLUSTER_MAIN_DEFAULT

Returns: ILoadBalancer[] Map of (cluster name => ILoadBalancer)

Since: 1.29

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 207 of file LBFactoryMulti.php.

◆ getExternalLB()

Wikimedia\Rdbms\LBFactoryMulti::getExternalLB ( $cluster )

Get the tracked load balancer instance for an external cluster.

If no tracked instances exists, then one will be instantiated

Parameters

string $cluster External cluster name

Exceptions

InvalidArgumentException If $cluster is not recognized

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 197 of file LBFactoryMulti.php.

◆ getLBsForOwner()

Wikimedia\Rdbms\LBFactoryMulti::getLBsForOwner ( )

protected

Get all tracked load balancers with the internal "for owner" interface.

Most subclasses override this, we just provide an implementation here for the benefit of Wikibase's FakeLBFactory.

Returns: Generator|ILoadBalancerForOwner[]

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 237 of file LBFactoryMulti.php.

◆ getMainLB()

Wikimedia\Rdbms\LBFactoryMulti::getMainLB ( $domain = false )

Get the tracked load balancer instance for the main cluster that handles the given domain.

If no tracked instances exists, then one will be instantiated

Note: The local/default database domain used by the load balancer instance will still inherit from this ILBFactory instance, regardless of the $domain parameter.

Parameters

string | false $domain Domain ID, or false for the current domain

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 170 of file LBFactoryMulti.php.

◆ newExternalLB()

Wikimedia\Rdbms\LBFactoryMulti::newExternalLB ( $cluster )

Create a new load balancer instance for an external cluster.

The resulting object will be untracked and the caller is responsible for cleaning it up. Database replication positions will not be saved by ChronologyProtector.

This method is for only advanced usage and callers should almost always use getExternalLB() instead. This method can be useful when a table is used as a key/value store. In that cases, one might want to query it in autocommit mode (DBO_TRX off) but still use DBO_TRX transaction rounds on other tables.

Parameters

string $cluster External cluster name

Exceptions

InvalidArgumentException If $cluster is not recognized

Returns: ILoadBalancerForOwner

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 181 of file LBFactoryMulti.php.

◆ newMainLB()

Wikimedia\Rdbms\LBFactoryMulti::newMainLB ( $domain = false )

Create a new load balancer instance for the main cluster that handles the given domain.

The resulting object will be untracked and the caller is responsible for cleaning it up. Database replication positions will not be saved by ChronologyProtector.

This method is for only advanced usage and callers should almost always use getMainLB() instead. This method can be useful when a table is used as a key/value store. In that cases, one might want to query it in autocommit mode (DBO_TRX off) but still use DBO_TRX transaction rounds on other tables.

Note: The local/default database domain used by the load balancer instance will still inherit from this ILBFactory instance, regardless of the $domain parameter.

Parameters

string | false $domain Domain ID, or false for the current domain

Returns: ILoadBalancerForOwner

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 147 of file LBFactoryMulti.php.

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

includes/libs/rdbms/lbfactory/LBFactoryMulti.php

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ forEachLB()

◆ getAllExternalLBs()

◆ getAllMainLBs()

◆ getExternalLB()

◆ getLBsForOwner()

◆ getMainLB()

◆ newExternalLB()

◆ newMainLB()