MediaWiki master
|
Inherits Wikimedia\Rdbms\ILoadBalancerForOwner.
Inherited by Wikimedia\Rdbms\LoadBalancerDisabled, and Wikimedia\Rdbms\LoadBalancerSingle.
Public Member Functions | |
__construct (array $params) | |
approvePrimaryChanges (int $maxWriteDuration, $fname=__METHOD__) | |
Perform all pre-commit checks for things like replication safety. | |
beginPrimaryChanges ( $fname=__METHOD__) | |
Flush any primary transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set) | |
closeAll ( $fname=__METHOD__) | |
Close all open connections. | |
commitPrimaryChanges ( $fname=__METHOD__) | |
Issue COMMIT on all open primary connections to flush changes and view snapshots. | |
disable ( $fname=__METHOD__) | |
Close all connections and disable this load balancer. | |
explicitTrxActive () | |
Determine whether an explicit transaction is active on any open primary connection. | |
finalizePrimaryChanges ( $fname=__METHOD__) | |
Run pre-commit callbacks and defer execution of post-commit callbacks. | |
flushPrimarySessions ( $fname=__METHOD__) | |
Release/destroy session-level named locks, table locks, and temp tables. | |
flushPrimarySnapshots ( $fname=__METHOD__) | |
Commit all primary DB transactions so as to flush any REPEATABLE-READ or SSI snapshots. | |
flushReplicaSnapshots ( $fname=__METHOD__) | |
Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshots. | |
getAnyOpenConnection ( $i, $flags=0) | |
getClusterName () | |
Get the name of the overall cluster of database servers managing the dataset. | |
getConnection ( $i, $groups=[], $domain=false, $flags=0) | |
Get a lazy-connecting database handle for a specific or virtual (DB_PRIMARY/DB_REPLICA) server index. | |
getConnectionInternal ( $i, $groups=[], $domain=false, $flags=0) | |
getConnectionRef ( $i, $groups=[], $domain=false, $flags=0) | |
getLagTimes () | |
Get an estimate of replication lag (in seconds) for each server. | |
getLocalDomainID () | |
Get the local (and default) database domain ID of connection handles. | |
getMaintenanceConnectionRef ( $i, $groups=[], $domain=false, $flags=0) | |
Get a DB handle, suitable for migrations and schema changes, for a server index. | |
getMaxLag () | |
Get the name and lag time of the most-lagged replica server. | |
getPrimaryPos () | |
Get the current primary replication position. | |
getReaderIndex ( $group=false) | |
Get the specific server index of the reader connection for a given group. | |
getReadOnlyReason ( $domain=false) | |
getServerAttributes ( $i) | |
Get basic attributes of the server with the specified index without connecting. | |
getServerConnection ( $i, $domain, $flags=0) | |
Get a DB handle for a specific server index. | |
getServerCount () | |
Get the number of servers defined in configuration. | |
getServerInfo ( $i) | |
Return the server configuration map for the server with the specified index. | |
getServerName ( $i) | |
Get the readable name of the server with the specified index. | |
getServerType ( $i) | |
Get the RDBMS type of the server with the specified index (e.g. | |
getWriterIndex () | |
Get the specific server index of the "writer server". | |
hasOrMadeRecentPrimaryChanges ( $age=null) | |
Check if this load balancer object had any recent or still pending writes issued against it by this PHP thread. | |
hasPrimaryChanges () | |
Whether there are pending changes or callbacks in a transaction by this thread. | |
hasPrimaryConnection () | |
hasReplicaServers () | |
Whether there are any replica servers configured. | |
hasStreamingReplicaServers () | |
Whether any replica servers use streaming replication from the primary server. | |
laggedReplicaUsed () | |
Whether a highly "lagged" replica database connection was queried. | |
lastPrimaryChangeTimestamp () | |
Get the timestamp of the latest write query done by this thread. | |
pendingPrimaryChangeCallers () | |
Get the list of callers that have pending primary changes. | |
pingAll () | |
reconfigure (array $params) | |
Apply updated configuration. | |
redefineLocalDomain ( $domain) | |
Close all connection and redefine the local domain for testing or schema creation. | |
resolveDomainID ( $domain) | |
reuseConnection (IDatabase $conn) | |
rollbackPrimaryChanges ( $fname=__METHOD__) | |
Issue ROLLBACK only on primary, only if queries were done on connection. | |
runPrimaryTransactionIdleCallbacks ( $fname=__METHOD__) | |
Consume and run all pending post-COMMIT/ROLLBACK callbacks and commit dangling transactions. | |
runPrimaryTransactionListenerCallbacks ( $fname=__METHOD__) | |
Run all recurring post-COMMIT/ROLLBACK listener callbacks. | |
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. | |
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. | |
setTempTablesOnlyMode ( $value, $domain) | |
Indicate whether the tables on this domain are only temporary tables for testing. | |
setTransactionListener ( $name, callable $callback=null) | |
Set a callback via IDatabase::setTransactionListener() on all current and future primary connections of this load balancer. | |
waitForAll (DBPrimaryPos $pos, $timeout=null) | |
Set the primary wait position and wait for ALL replica DBs to catch up to it. | |
waitForPrimaryPos (IDatabase $conn) | |
Wait for a replica DB to reach a specified primary position. | |
Public Attributes | |
const | MAX_LAG_DEFAULT = ServerInfo::MAX_LAG_DEFAULT |
Default 'maxLag' when unspecified. | |
![]() | |
const | STAGE_POSTCOMMIT_CALLBACKS = 'stage-postcommit-callbacks' |
Manager of ILoadBalancer instances is running post-commit callbacks. | |
const | STAGE_POSTROLLBACK_CALLBACKS = 'stage-postrollback-callbacks' |
Manager of ILoadBalancer instances is running post-rollback callbacks. | |
![]() | |
const | CONN_INTENT_WRITABLE = 8 |
Caller is requesting the primary DB server for possibly writes. | |
const | CONN_SILENCE_ERRORS = 4 |
Yield null on connection failure instead of throwing an exception. | |
const | CONN_TRX_AUTOCOMMIT = 2 |
Yield a tracked autocommit-mode handle (reuse existing ones) | |
const | CONN_UNTRACKED_GAUGE = 1 |
Yield an untracked, low-timeout, autocommit-mode handle (to gauge server health) | |
const | DB_MASTER = self::DB_PRIMARY |
Request a primary, write-enabled DB connection. | |
const | DB_PRIMARY = -2 |
Request a primary, write-enabled DB connection. | |
const | DB_REPLICA = -1 |
Request a replica DB connection. | |
const | DOMAIN_ANY = '' |
Domain specifier when no specific database needs to be selected. | |
const | GROUP_GENERIC = '' |
The generic query group. | |
Protected Member Functions | |
configure (array $params) | |
getConnLogContext (IDatabase $conn, array $extras=[]) | |
Create a log context to pass to PSR-3 logger functions. | |
getExistingReaderIndex ( $group) | |
Get the server index chosen for DB_REPLICA connections for the given query group. | |
reallyOpenConnection ( $i, DatabaseDomain $domain, array $lbInfo) | |
Open a new network connection to a server (uncached) | |
resolveDomainInstance ( $domain) | |
Definition at line 41 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::__construct | ( | array | $params | ) |
array | $params | Parameter map with keys:
|
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Reimplemented in Wikimedia\Rdbms\LoadBalancerSingle.
Definition at line 159 of file LoadBalancer.php.
References Wikimedia\Rdbms\LoadBalancer\configure().
Wikimedia\Rdbms\LoadBalancer::approvePrimaryChanges | ( | int | $maxWriteDuration, |
$fname = __METHOD__ |
|||
) |
Perform all pre-commit checks for things like replication safety.
Use this only for multi-database commits
int | $maxWriteDuration | : max write query duration time in seconds |
string | $fname | Caller name |
DBTransactionError |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1364 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::beginPrimaryChanges | ( | $fname = __METHOD__ | ) |
Flush any primary transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set)
The DBO_TRX setting will be reverted to the default in each of these methods:
string | $fname | Caller name |
DBExpectedError |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1418 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::closeAll | ( | $fname = __METHOD__ | ) |
Close all open connections.
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1282 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::commitPrimaryChanges | ( | $fname = __METHOD__ | ) |
Issue COMMIT on all open primary connections to flush changes and view snapshots.
string | $fname | Caller name |
DBExpectedError |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1444 of file LoadBalancer.php.
References Wikimedia\Rdbms\IDatabase\commit().
|
protected |
array | $params | A database configuration array, see $wgLBFactoryConf. |
Definition at line 170 of file LoadBalancer.php.
Referenced by Wikimedia\Rdbms\LoadBalancer\__construct().
Wikimedia\Rdbms\LoadBalancer::disable | ( | $fname = __METHOD__ | ) |
Close all connections and disable this load balancer.
Any attempt to open a new connection will result in a DBAccessError.
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1277 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::explicitTrxActive | ( | ) |
Determine whether an explicit transaction is active on any open primary connection.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1719 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::finalizePrimaryChanges | ( | $fname = __METHOD__ | ) |
Run pre-commit callbacks and defer execution of post-commit callbacks.
Use this only for multi-database commits
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1338 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::flushPrimarySessions | ( | $fname = __METHOD__ | ) |
Release/destroy session-level named locks, table locks, and temp tables.
Only call this function right after calling rollbackPrimaryChanges()
string | $fname | Caller name |
DBExpectedError |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1586 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::flushPrimarySnapshots | ( | $fname = __METHOD__ | ) |
Commit all primary DB transactions so as to flush any REPEATABLE-READ or SSI snapshots.
An error will be thrown if a connection has pending writes or callbacks
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1674 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::flushReplicaSnapshots | ( | $fname = __METHOD__ | ) |
Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshots.
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1661 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getAnyOpenConnection | ( | $i, | |
$flags = 0 |
|||
) |
Definition at line 604 of file LoadBalancer.php.
References DB_PRIMARY.
Wikimedia\Rdbms\LoadBalancer::getClusterName | ( | ) |
Get the name of the overall cluster of database servers managing the dataset.
Note that the cluster might contain servers in multiple datacenters. The load balancer instance only needs to be aware of the local replica servers, along with either the sole-primary server or the local co-primary server.
This is useful for identifying a cluster or replicated dataset, even when:
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 244 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getConnection | ( | $i, | |
$groups = [] , |
|||
$domain = false , |
|||
$flags = 0 |
|||
) |
Get a lazy-connecting database handle for a specific or virtual (DB_PRIMARY/DB_REPLICA) server index.
The server index, $i, can be one of the following:
Handle sharing is very useful when callers get DB_PRIMARY handles that are transaction round aware (the default). All such callers will operate within a single transaction as a consequence. The same applies to DB_REPLICA that are samely query grouped (the default) and transaction round aware (the default).
Use CONN_TRX_AUTOCOMMIT to use a separate pool of only autocommit handles. This flag is ignored for databases with ATTR_DB_LEVEL_LOCKING (e.g. sqlite) in order to avoid deadlocks. getServerAttributes() can be used to check this attribute beforehand. Avoid using begin() and commit() on such handles. If handle methods like startAtomic() and endAtomic() must be used on the handles, callers should at least make sure that the atomic sections are closed on failure via try/catch and cancelAtomic().
Use CONN_UNTRACKED_GAUGE to get a new, untracked, handle, that uses a low connection timeout, a low read timeout, and autocommit mode. This flag is intended for use only be internal callers.
CONN_UNTRACKED_GAUGE and CONN_TRX_AUTOCOMMIT are incompatible.
int | $i | Specific (overrides $groups) or virtual (DB_PRIMARY/DB_REPLICA) server index |
string[] | string | $groups | Query group(s) in preference order; [] for the default group |
string | false | $domain | DB domain ID or false for the local domain |
int | $flags | Bitfield of CONN_* class constants |
Implements Wikimedia\Rdbms\ILoadBalancer.
Reimplemented in Wikimedia\Rdbms\LoadBalancerDisabled.
Definition at line 739 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getConnectionInternal | ( | $i, | |
$groups = [] , |
|||
$domain = false , |
|||
$flags = 0 |
|||
) |
int | $i | Specific (overrides $groups) or virtual (DB_PRIMARY/DB_REPLICA) server index |
string[] | string | $groups | Query group(s) in preference order; [] for the default group |
string | false | $domain | DB domain ID or false for the local domain |
int | $flags | Bitfield of CONN_* class constants (e.g. CONN_TRX_AUTOCOMMIT) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Reimplemented in Wikimedia\Rdbms\LoadBalancerDisabled.
Definition at line 743 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getConnectionRef | ( | $i, | |
$groups = [] , |
|||
$domain = false , |
|||
$flags = 0 |
|||
) |
int | $i | Specific or virtual (DB_PRIMARY/DB_REPLICA) server index |
string[] | string | $groups | Query group(s) in preference order; [] for the default group |
string | false | $domain | DB domain ID or false for the local domain |
int | $flags | Bitfield of CONN_* class constants (e.g. CONN_TRX_AUTOCOMMIT) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Reimplemented in Wikimedia\Rdbms\LoadBalancerDisabled.
Definition at line 812 of file LoadBalancer.php.
|
protected |
Create a log context to pass to PSR-3 logger functions.
IDatabase | $conn | |
array | $extras | Additional data to add to context |
Definition at line 1976 of file LoadBalancer.php.
References Wikimedia\Rdbms\IReadableDatabase\getDomainID(), and Wikimedia\Rdbms\IReadableDatabase\getServerName().
|
protected |
Get the server index chosen for DB_REPLICA connections for the given query group.
string | $group | Query group; use false for the generic group |
Definition at line 490 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getLagTimes | ( | ) |
Get an estimate of replication lag (in seconds) for each server.
Results are cached for a short time in memcached/process cache
Values may be "false" if replication is too broken to estimate
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1845 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getLocalDomainID | ( | ) |
Get the local (and default) database domain ID of connection handles.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 249 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getMaintenanceConnectionRef | ( | $i, | |
$groups = [] , |
|||
$domain = false , |
|||
$flags = 0 |
|||
) |
Get a DB handle, suitable for migrations and schema changes, for a server index.
The DBConnRef methods simply proxy an underlying IDatabase object which takes care of the actual connection and query logic.
The CONN_TRX_AUTOCOMMIT flag is ignored for databases with ATTR_DB_LEVEL_LOCKING (e.g. sqlite) in order to avoid deadlocks. getServerAttributes() can be used to check such flags beforehand. Avoid the use of begin() or startAtomic() on any CONN_TRX_AUTOCOMMIT connections.
int | $i | Specific or virtual (DB_PRIMARY/DB_REPLICA) server index |
string[] | string | $groups | Query group(s) in preference order; [] for the default group |
string | false | $domain | DB domain ID or false for the local domain |
int | $flags | Bitfield of CONN_* class constants (e.g. CONN_TRX_AUTOCOMMIT) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Reimplemented in Wikimedia\Rdbms\LoadBalancerDisabled.
Definition at line 827 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getMaxLag | ( | ) |
Get the name and lag time of the most-lagged replica server.
This is useful for maintenance scripts that need to throttle their updates. May attempt to open connections to replica DBs on the default DB. If there is no lag, the maximum lag will be reported as -1.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1826 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getPrimaryPos | ( | ) |
Get the current primary replication position.
DBError |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1190 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getReaderIndex | ( | $group = false | ) |
Get the specific server index of the reader connection for a given group.
This takes into account load ratios and lag times. It should return a consistent index during the life time of the load balancer. This initially checks replica DBs for connectivity to avoid returning an unusable server. This means that connections might be attempted by calling this method (usually one at the most but possibly more). Subsequent calls with the same $group will not need to make new connection attempts since the acquired connection for each group is preserved.
string | false | $group | Query group or false for the generic group |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 425 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getReadOnlyReason | ( | $domain = false | ) |
string | false | $domain | DB domain ID or false (unused and deprecated since 1.40) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1737 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getServerAttributes | ( | $i | ) |
Get basic attributes of the server with the specified index without connecting.
int | $i | Specific server index |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 961 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getServerConnection | ( | $i, | |
$domain, | |||
$flags = 0 |
|||
) |
Get a DB handle for a specific server index.
This is an internal utility method for methods like LoadBalancer::getConnectionInternal() and DBConnRef to create the underlying connection to a concrete server.
The following is the responsibility of the caller:
int | $i | Specific server index |
string | $domain | Resolved DB domain |
int | $flags | Bitfield of class CONN_* constants |
DBError | If no DB handle could be obtained and CONN_SILENCE_ERRORS is not set |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 770 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getServerCount | ( | ) |
Get the number of servers defined in configuration.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1166 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getServerInfo | ( | $i | ) |
Return the server configuration map for the server with the specified index.
int | $i | Specific server index |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1182 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getServerName | ( | $i | ) |
Get the readable name of the server with the specified index.
int | $i | Specific server index |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1178 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getServerType | ( | $i | ) |
Get the RDBMS type of the server with the specified index (e.g.
"mysql", "sqlite")
int | $i | Specific server index |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1186 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::getWriterIndex | ( | ) |
Get the specific server index of the "writer server".
The "writer server" is the server that should be used to source writes and critical reads originating from the local datacenter. The "writer server" will be one of the following:
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1162 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::hasOrMadeRecentPrimaryChanges | ( | $age = null | ) |
Check if this load balancer object had any recent or still pending writes issued against it by this PHP thread.
float | null | $age | How many seconds ago is "recent" [defaults to mWaitTimeout] |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1703 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::hasPrimaryChanges | ( | ) |
Whether there are pending changes or callbacks in a transaction by this thread.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1684 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::hasPrimaryConnection | ( | ) |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1680 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::hasReplicaServers | ( | ) |
Whether there are any replica servers configured.
This scans the list of servers defined in configuration, checking for:
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1170 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::hasStreamingReplicaServers | ( | ) |
Whether any replica servers use streaming replication from the primary server.
This scans the list of servers defined in configuration, checking for:
It is possible for some replicas to be configured with "is static" but not others, though it generally should either be set for all or none of the replicas.
If this returns false, this means that there is generally no reason to execute replication wait logic for session consistency and lag reduction.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1174 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::laggedReplicaUsed | ( | ) |
Whether a highly "lagged" replica database connection was queried.
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1733 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::lastPrimaryChangeTimestamp | ( | ) |
Get the timestamp of the latest write query done by this thread.
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1694 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::pendingPrimaryChangeCallers | ( | ) |
Get the list of callers that have pending primary changes.
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1710 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::pingAll | ( | ) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1788 of file LoadBalancer.php.
References $success.
|
protected |
Open a new network connection to a server (uncached)
Returns a Database object whether or not the connection was successful.
int | $i | Specific server index |
DatabaseDomain | $domain | Domain the connection is for, possibly unspecified |
array | $lbInfo | Additional information for setLBInfo() |
DBAccessError | |
InvalidArgumentException |
Reimplemented in Wikimedia\Rdbms\LoadBalancerDisabled, and Wikimedia\Rdbms\LoadBalancerSingle.
Definition at line 980 of file LoadBalancer.php.
References DBO_DEFAULT, Wikimedia\Rdbms\DatabaseDomain\getDatabase(), Wikimedia\Rdbms\DatabaseDomain\getId(), Wikimedia\Rdbms\DatabaseDomain\getSchema(), and Wikimedia\Rdbms\DatabaseDomain\getTablePrefix().
Wikimedia\Rdbms\LoadBalancer::reconfigure | ( | array | $params | ) |
Apply updated configuration.
This only unregisters servers that were removed in the new configuration. It does not register new servers nor update the group load weights.
This invalidates any open connections. However, existing connections may continue to be used while they are in an active transaction. In that case, the old connection will be discarded on the first operation after the transaction is complete. The next operation will use a new connection based on the new configuration.
array | $params | A database configuration array, see $wgLBFactoryConf. |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1229 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::redefineLocalDomain | ( | $domain | ) |
Close all connection and redefine the local domain for testing or schema creation.
DatabaseDomain | string | $domain |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1935 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::resolveDomainID | ( | $domain | ) |
DatabaseDomain | string | false | $domain | Database domain |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 253 of file LoadBalancer.php.
|
finalprotected |
DatabaseDomain | string | false | $domain |
Definition at line 261 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::reuseConnection | ( | IDatabase | $conn | ) |
IDatabase | $conn |
Implements Wikimedia\Rdbms\ILoadBalancer.
Reimplemented in Wikimedia\Rdbms\LoadBalancerDisabled, and Wikimedia\Rdbms\LoadBalancerSingle.
Definition at line 808 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::rollbackPrimaryChanges | ( | $fname = __METHOD__ | ) |
Issue ROLLBACK only on primary, only if queries were done on connection.
string | $fname | Caller name |
DBExpectedError |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1567 of file LoadBalancer.php.
References Wikimedia\Rdbms\IDatabase\rollback().
Wikimedia\Rdbms\LoadBalancer::runPrimaryTransactionIdleCallbacks | ( | $fname = __METHOD__ | ) |
Consume and run all pending post-COMMIT/ROLLBACK callbacks and commit dangling transactions.
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1479 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::runPrimaryTransactionListenerCallbacks | ( | $fname = __METHOD__ | ) |
Run all recurring post-COMMIT/ROLLBACK listener callbacks.
string | $fname | Caller name |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1543 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::setDomainAliases | ( | array | $aliases | ) |
Convert certain database domains to alternative ones.
This can be used for backwards compatibility logic.
DatabaseDomain[] | string[] | $aliases | Map of (domain alias => domain) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1914 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::setIndexAliases | ( | array | $aliases | ) |
Convert certain index names to alternative names before querying the DB.
Note that this applies to indexes regardless of the table they belong to.
This can be employed when an index was renamed X => Y in code, but the new Y-named indexes were not yet built on all DBs. After all the Y-named ones are added by the DBA, the aliases can be removed, and then the old X-named indexes dropped.
string[] | $aliases |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1910 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::setLocalDomainPrefix | ( | $prefix | ) |
Set a new table prefix for the existing local domain ID for testing.
string | $prefix |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 1918 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::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.
For example, "user" can be converted to "myschema.mydbname.user" for convenience. Appearances like user
, somedb.user, somedb.someschema.user will used literally.
Calling this twice will completely clear any old table aliases. Also, note that callers are responsible for making sure the schemas and databases actually exist.
array[] | $aliases | Map of (table => (dbname, schema, prefix) map) |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1906 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::setTempTablesOnlyMode | ( | $value, | |
$domain | |||
) |
Indicate whether the tables on this domain are only temporary tables for testing.
In "temporary tables mode", the CONN_TRX_AUTOCOMMIT flag is ignored
bool | $value | |
string | $domain |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1940 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::setTransactionListener | ( | $name, | |
callable | $callback = null |
||
) |
Set a callback via IDatabase::setTransactionListener() on all current and future primary connections of this load balancer.
string | $name | Callback name |
callable | null | $callback |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1895 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::waitForAll | ( | DBPrimaryPos | $pos, |
$timeout = null |
|||
) |
Set the primary wait position and wait for ALL replica DBs to catch up to it.
This method is only intended for use a throttling mechanism for high-volume updates. Unlike waitFor(), failure does not effect laggedReplicaUsed().
DBPrimaryPos | $pos | Primary position |
int | null | $timeout | Max seconds to wait; default is mWaitTimeout |
Implements Wikimedia\Rdbms\ILoadBalancerForOwner.
Definition at line 564 of file LoadBalancer.php.
Wikimedia\Rdbms\LoadBalancer::waitForPrimaryPos | ( | IDatabase | $conn | ) |
Wait for a replica DB to reach a specified primary position.
If $conn is not a replica server connection, then this will return true. Otherwise, if $pos is not provided, this will connect to the primary server to get an accurate position.
IDatabase | $conn | Replica DB |
Implements Wikimedia\Rdbms\ILoadBalancer.
Definition at line 1853 of file LoadBalancer.php.
References Wikimedia\Rdbms\IDatabase\getLBInfo(), and Wikimedia\Rdbms\IReadableDatabase\primaryPosWait().
const Wikimedia\Rdbms\LoadBalancer::MAX_LAG_DEFAULT = ServerInfo::MAX_LAG_DEFAULT |
Default 'maxLag' when unspecified.
Definition at line 126 of file LoadBalancer.php.
Referenced by Wikimedia\Rdbms\LoadMonitor\__construct().