MediaWiki REL1_28
TransactionProfiler Class Reference

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

Inheritance diagram for TransactionProfiler:
Collaboration diagram for TransactionProfiler:

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.
 
 resetExpectations ()
 Reset performance expectations and hit counters.
 
 setExpectation ( $event, $value, $fname)
 Set performance expectations.
 
 setExpectations (array $expects, $fname)
 Set 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)
 Mark a DB as no longer in a transaction.
 

Protected Member Functions

 reportExpectationViolated ( $expect, $query, $actual=null)
 

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 = .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 36 of file TransactionProfiler.php.

Constructor & Destructor Documentation

◆ __construct()

TransactionProfiler::__construct ( )

Definition at line 74 of file TransactionProfiler.php.

References setLogger().

Member Function Documentation

◆ recordConnection()

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$serverDB server
string$dbDB name
bool$isMaster

Definition at line 154 of file TransactionProfiler.php.

References reportExpectationViolated().

◆ recordQueryCompletion()

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$queryFunction name or generalized SQL
float$sTimeStarting UNIX wall time
bool$isWriteWhether this is a write query
integer$nNumber of affected rows

Definition at line 200 of file TransactionProfiler.php.

References $name, $query, as, and reportExpectationViolated().

◆ reportExpectationViolated()

TransactionProfiler::reportExpectationViolated (   $expect,
  $query,
  $actual = null 
)
protected
Parameters
string$expect
string$query
string | float | int$actual[optional]

Definition at line 321 of file TransactionProfiler.php.

References $expect.

Referenced by recordConnection(), recordQueryCompletion(), and transactionWritingOut().

◆ resetExpectations()

TransactionProfiler::resetExpectations ( )

Reset performance expectations and hit counters.

Since
1.25

Definition at line 133 of file TransactionProfiler.php.

References as.

◆ setExpectation()

TransactionProfiler::setExpectation (   $event,
  $value,
  $fname 
)

Set performance expectations.

With conflicting expectations, the most narrow ones will be used

Parameters
string$event(writes,queries,conns,mConns)
integer$valueMaximum count of the event
string$fnameCaller
Since
1.25

Definition at line 104 of file TransactionProfiler.php.

References $fname, and $value.

Referenced by setExpectations().

◆ setExpectations()

TransactionProfiler::setExpectations ( array  $expects,
  $fname 
)

Set multiple performance expectations.

With conflicting expectations, the most narrow ones will be used

Parameters
array$expectsMap of (event => limit)
$fname
Since
1.26

Definition at line 122 of file TransactionProfiler.php.

References $fname, $value, as, and setExpectation().

◆ setLogger()

TransactionProfiler::setLogger ( LoggerInterface  $logger)

Definition at line 78 of file TransactionProfiler.php.

References $logger.

Referenced by __construct().

◆ setSilenced()

TransactionProfiler::setSilenced (   $value)
Parameters
bool$valueNew value
Returns
bool Old value
Since
1.28

Definition at line 87 of file TransactionProfiler.php.

References $silenced, and $value.

◆ transactionWritingIn()

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$serverDB server
string$dbDB name
string$idID string of transaction

Definition at line 173 of file TransactionProfiler.php.

References $name, and as.

◆ transactionWritingOut()

TransactionProfiler::transactionWritingOut (   $server,
  $db,
  $id,
  $writeTime = 0.0 
)

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$serverDB server
string$dbDB name
string$idID string of transaction
float$writeTimeTime spent in write queries

Definition at line 266 of file TransactionProfiler.php.

References $name, $query, as, list, and reportExpectationViolated().

Member Data Documentation

◆ $dbLockThreshold

float TransactionProfiler::$dbLockThreshold = 3.0
protected

Seconds.

Definition at line 38 of file TransactionProfiler.php.

◆ $dbTrxHoldingLocks

array TransactionProfiler::$dbTrxHoldingLocks = []
protected

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

Definition at line 45 of file TransactionProfiler.php.

◆ $dbTrxMethodTimes

array TransactionProfiler::$dbTrxMethodTimes = []
protected

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

Definition at line 47 of file TransactionProfiler.php.

◆ $eventThreshold

float TransactionProfiler::$eventThreshold = .25
protected

Seconds.

Definition at line 40 of file TransactionProfiler.php.

◆ $expect

array TransactionProfiler::$expect
protected
Initial value:
= [
'writes' => INF,
'queries' => INF,
'conns' => INF,
'masterConns' => INF,
'maxAffected' => INF,
'readQueryTime' => INF,
'writeQueryTime' => INF
]

Definition at line 57 of file TransactionProfiler.php.

Referenced by reportExpectationViolated().

◆ $expectBy

array TransactionProfiler::$expectBy = []
protected

Definition at line 67 of file TransactionProfiler.php.

◆ $hits

array TransactionProfiler::$hits
protected
Initial value:
= [
'writes' => 0,
'queries' => 0,
'conns' => 0,
'masterConns' => 0
]

Definition at line 50 of file TransactionProfiler.php.

◆ $logger

LoggerInterface TransactionProfiler::$logger
private

Definition at line 72 of file TransactionProfiler.php.

Referenced by setLogger().

◆ $silenced

bool TransactionProfiler::$silenced = false
protected

Definition at line 42 of file TransactionProfiler.php.

Referenced by setSilenced().


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