Helper class that detects high-contention DB queries via profiling calls. More...

Inheritance diagram for Wikimedia\Rdbms\TransactionProfiler:

Collaboration diagram for Wikimedia\Rdbms\TransactionProfiler:

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Public Member Functions
	__construct ()

	recordConnection ( $server, $db, $isMaster)
	Mark a DB as having been connected to with a new handle.

	recordQueryCompletion ( $query, $sTime, $isWrite=false, $n=0)
	Register the name and time of a method for slow DB trx detection.

	redefineExpectations (array $expects, $fname)
	Clear all expectations and hit counters and set new performance expectations.

	resetExpectations ()
	Reset all performance expectations and hit counters.

	setExpectation ( $event, $value, $fname)
	Set performance expectations.

	setExpectations (array $expects, $fname)
	Set one or multiple performance expectations.

	setLogger (LoggerInterface $logger)

	setSilenced ( $value)

	transactionWritingIn ( $server, $db, $id)
	Mark a DB as in a transaction with one or more writes pending.

	transactionWritingOut ( $server, $db, $id, $writeTime=0.0, $affected=0)
	Mark a DB as no longer in a transaction.

Protected Member Functions
	reportExpectationViolated ( $expect, $query, $actual)

Protected Attributes
float	$dbLockThreshold = 3.0
	Seconds.

array	$dbTrxHoldingLocks = []
	transaction ID => (write start time, list of DBs involved)

array	$dbTrxMethodTimes = []
	transaction ID => list of (query name, start time, end time)

float	$eventThreshold = 0.25
	Seconds.

array	$expect

array	$expectBy = []

array	$hits

bool	$silenced = false

Private Attributes
LoggerInterface	$logger

Detailed Description

Helper class that detects high-contention DB queries via profiling calls.

This class is meant to work with an IDatabase object, which manages queries

Since: 1.24

Definition at line 38 of file TransactionProfiler.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\TransactionProfiler::__construct ( )

Definition at line 77 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\setLogger().

Member Function Documentation

◆ recordConnection()

Wikimedia\Rdbms\TransactionProfiler::recordConnection	(	$server,
		$db,
		$isMaster
	)

Mark a DB as having been connected to with a new handle.

Note that there can be multiple connections to a single DB.

Parameters

string	$server	DB server
string	$db	DB name
bool	$isMaster

Definition at line 178 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\reportExpectationViolated().

◆ recordQueryCompletion()

Wikimedia\Rdbms\TransactionProfiler::recordQueryCompletion	(	$query,
		$sTime,
		$isWrite = `false`,
		$n = `0`
	)

Register the name and time of a method for slow DB trx detection.

This assumes that all queries are synchronous (non-overlapping)

Parameters

string	$query	Function name or generalized SQL
float	$sTime	Starting UNIX wall time
bool	$isWrite	Whether this is a write query
int	$n	Number of affected/read rows

Definition at line 226 of file TransactionProfiler.php.

References $name, $query, as, and Wikimedia\Rdbms\TransactionProfiler\reportExpectationViolated().

◆ redefineExpectations()

Wikimedia\Rdbms\TransactionProfiler::redefineExpectations	(	array	$expects,
			$fname
	)

Clear all expectations and hit counters and set new performance expectations.

Use this to apply a totally different set of expectations for a different part of the request, such as during "post-send" (execution after HTTP response completion)

Parameters

array	$expects	Map of (event => limit)
string	$fname

Since: 1.33

Definition at line 164 of file TransactionProfiler.php.

References $fname, Wikimedia\Rdbms\TransactionProfiler\resetExpectations(), and Wikimedia\Rdbms\TransactionProfiler\setExpectations().

◆ reportExpectationViolated()

Wikimedia\Rdbms\TransactionProfiler::reportExpectationViolated	(	$expect,
		$query,
		$actual
	)

protected

Parameters

string	$expect
string	$query
string \| float \| int	$actual

Definition at line 360 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\$expect, and $query.

Referenced by Wikimedia\Rdbms\TransactionProfiler\recordConnection(), Wikimedia\Rdbms\TransactionProfiler\recordQueryCompletion(), and Wikimedia\Rdbms\TransactionProfiler\transactionWritingOut().

◆ resetExpectations()

Wikimedia\Rdbms\TransactionProfiler::resetExpectations ( )

Reset all performance expectations and hit counters.

Use this for unit testing or before applying a totally different set of expectations for a different part of the request, such as during "post-send" (execution after HTTP response completion)

Since: 1.25

Definition at line 142 of file TransactionProfiler.php.

References as.

Referenced by Wikimedia\Rdbms\TransactionProfiler\redefineExpectations().

◆ setExpectation()

Wikimedia\Rdbms\TransactionProfiler::setExpectation	(	$event,
		$value,
		$fname
	)

Set performance expectations.

With conflicting expectations, the most narrow ones will be used

Parameters

string	$event	(writes,queries,conns,mConns)
int	$value	Maximum count of the event
string	$fname	Caller

Since: 1.25

Definition at line 107 of file TransactionProfiler.php.

References $fname, and $value.

Referenced by Wikimedia\Rdbms\TransactionProfiler\setExpectations().

◆ setExpectations()

Wikimedia\Rdbms\TransactionProfiler::setExpectations	(	array	$expects,
			$fname
	)

Set one or multiple performance expectations.

With conflicting expectations, the most narrow ones will be used

Use this to initialize expectations or make them stricter mid-request

Parameters

array	$expects	Map of (event => limit)
string	$fname

Since: 1.26

Definition at line 127 of file TransactionProfiler.php.

References $fname, $value, as, and Wikimedia\Rdbms\TransactionProfiler\setExpectation().

Referenced by Wikimedia\Rdbms\TransactionProfiler\redefineExpectations().

◆ setLogger()

Wikimedia\Rdbms\TransactionProfiler::setLogger ( LoggerInterface $logger )

Definition at line 81 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\$logger.

Referenced by Wikimedia\Rdbms\TransactionProfiler\__construct().

◆ setSilenced()

Wikimedia\Rdbms\TransactionProfiler::setSilenced ( $value )

Parameters

bool $value

Returns: bool Old value

Since: 1.28

Definition at line 90 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\$silenced, and $value.

◆ transactionWritingIn()

Wikimedia\Rdbms\TransactionProfiler::transactionWritingIn	(	$server,
		$db,
		$id
	)

Mark a DB as in a transaction with one or more writes pending.

Note that there can be multiple connections to a single DB.

Parameters

string	$server	DB server
string	$db	DB name
string	$id	ID string of transaction

Definition at line 199 of file TransactionProfiler.php.

References $name, and as.

◆ transactionWritingOut()

Wikimedia\Rdbms\TransactionProfiler::transactionWritingOut	(	$server,
		$db,
		$id,
		$writeTime = `0.0`,
		$affected = `0`
	)

Mark a DB as no longer in a transaction.

This will check if locks are possibly held for longer than needed and log any affected transactions to a special DB log. Note that there can be multiple connections to a single DB.

Parameters

string	$server	DB server
string	$db	DB name
string	$id	ID string of transaction
float	$writeTime	Time spent in write queries
int	$affected	Number of rows affected by writes

Definition at line 297 of file TransactionProfiler.php.

References $name, $query, as, list, and Wikimedia\Rdbms\TransactionProfiler\reportExpectationViolated().

Member Data Documentation

◆ $dbLockThreshold

float Wikimedia\Rdbms\TransactionProfiler::$dbLockThreshold = 3.0

protected

Seconds.

Definition at line 40 of file TransactionProfiler.php.

◆ $dbTrxHoldingLocks

array Wikimedia\Rdbms\TransactionProfiler::$dbTrxHoldingLocks = []

protected

transaction ID => (write start time, list of DBs involved)

Definition at line 47 of file TransactionProfiler.php.

◆ $dbTrxMethodTimes

array Wikimedia\Rdbms\TransactionProfiler::$dbTrxMethodTimes = []

protected

transaction ID => list of (query name, start time, end time)

Definition at line 49 of file TransactionProfiler.php.

◆ $eventThreshold

float Wikimedia\Rdbms\TransactionProfiler::$eventThreshold = 0.25

protected

Seconds.

Definition at line 42 of file TransactionProfiler.php.

◆ $expect

array Wikimedia\Rdbms\TransactionProfiler::$expect

protected

Initial value:

= [
        'writes'         => INF,
        'queries'        => INF,
        'conns'          => INF,
        'masterConns'    => INF,
        'maxAffected'    => INF,
        'readQueryRows'  => INF,
        'readQueryTime'  => INF,
        'writeQueryTime' => INF
    ]

Definition at line 59 of file TransactionProfiler.php.

Referenced by Wikimedia\Rdbms\TransactionProfiler\reportExpectationViolated().

◆ $expectBy

array Wikimedia\Rdbms\TransactionProfiler::$expectBy = []

protected

Definition at line 70 of file TransactionProfiler.php.

◆ $hits

array Wikimedia\Rdbms\TransactionProfiler::$hits

protected

Initial value:

= [
        'writes'      => 0,
        'queries'     => 0,
        'conns'       => 0,
        'masterConns' => 0
    ]

Definition at line 52 of file TransactionProfiler.php.

◆ $logger

LoggerInterface Wikimedia\Rdbms\TransactionProfiler::$logger

private

Definition at line 75 of file TransactionProfiler.php.

Referenced by Wikimedia\Rdbms\TransactionProfiler\setLogger().

◆ $silenced

bool Wikimedia\Rdbms\TransactionProfiler::$silenced = false

protected

Definition at line 44 of file TransactionProfiler.php.

Referenced by Wikimedia\Rdbms\TransactionProfiler\setSilenced().

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

includes/libs/rdbms/TransactionProfiler.php

Public Member Functions

Protected Member Functions

Protected Attributes

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ recordConnection()

◆ recordQueryCompletion()

◆ redefineExpectations()

◆ reportExpectationViolated()

◆ resetExpectations()

◆ setExpectation()

◆ setExpectations()

◆ setLogger()

◆ setSilenced()

◆ transactionWritingIn()

◆ transactionWritingOut()

Member Data Documentation

◆ $dbLockThreshold

◆ $dbTrxHoldingLocks

◆ $dbTrxMethodTimes

◆ $eventThreshold

◆ $expect

◆ $expectBy

◆ $hits

◆ $logger

◆ $silenced