A job to cleanup the wbt_* terms table rows when they may not be needed any more. More...

Inheritance diagram for Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob:

Collaboration diagram for Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob:

Public Member Functions
	__construct (TermStoreCleaner $cleaner, $params)

	run ()
	Of the given term in lang IDs, delete those that are not used by any other items or properties.

Static Public Member Functions
static	getJobSpecification (Title $unused, array $params)

static	getJobSpecificationNoTitle (array $params)

Public Attributes
const	JOB_NAME = 'CleanTermsIfUnused'

const	TERM_IN_LANG_IDS = 'termInLangIds'

Private Attributes
	$termInLangIdsCleaner

Detailed Description

A job to cleanup the wbt_* terms table rows when they may not be needed any more.

This job currently executes in a single transaction.

Callers can choose to supply a single termInLang id to clean per job or multiple. Supplying multiple ids will naturally mean the Job and the transaction take longer and therefor locks will also be held for a longer period of time possibly causing lock contention. This started to show on wikidata.org in https://phabricator.wikimedia.org/T246898 and thus the default was switched for create a single job per termInLang id. For smaller Wikibase installs with a lower edit rate it might make sense to instead optimize for fewer jobs, where lock contention is less of an issue.

Todo: Execute the cleanup of each table in its own transaction to further reduce lock contention

See also: Item & Property Terms

Author: Addshore

Copyright: GPL-2.0-or-later

Constructor & Destructor Documentation

◆ __construct()

Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::__construct	(	TermStoreCleaner	$cleaner,
			$params )

Member Function Documentation

◆ getJobSpecification()

static Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::getJobSpecification	(	Title	$unused,
		array	$params )

static

Parameters

Title	$unused	But required due to the code in Job::factory currently.
array	$params

Returns: CleanTermsIfUnusedJob

◆ getJobSpecificationNoTitle()

static Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::getJobSpecificationNoTitle ( array $params )

static

◆ run()

Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::run ( )

Of the given term in lang IDs, delete those that are not used by any other items or properties.

Returns: bool

Member Data Documentation

◆ $termInLangIdsCleaner

Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::$termInLangIdsCleaner

private

◆ JOB_NAME

const Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::JOB_NAME = 'CleanTermsIfUnused'

◆ TERM_IN_LANG_IDS

const Wikibase\Lib\Store\Sql\Terms\CleanTermsIfUnusedJob::TERM_IN_LANG_IDS = 'termInLangIds'

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

lib/includes/Store/Sql/Terms/CleanTermsIfUnusedJob.php

Public Member Functions

Static Public Member Functions

Public Attributes

Private Attributes