/**
* Initialise a LoadBalancer to give it appropriate chronology protection.
*
* If the session has a previous master position recorded, this will try to
* make sure that the next query to a slave of that master will see changes up
* to that position by delaying execution. The delay may timeout and allow stale
* data if no non-lagged slaves are available.
*
* @param LoadBalancer $lb
* @return void
*/
public function initLB(LoadBalancer $lb)
{
if ($lb->getServerCount() <= 1) {
return;
// non-replicated setup
}
if (!$this->initialized) {
$this->initialized = true;
if (isset($_SESSION[__CLASS__]) && is_array($_SESSION[__CLASS__])) {
$this->startupPositions = $_SESSION[__CLASS__];
}
}
$masterName = $lb->getServerName(0);
if (!empty($this->startupPositions[$masterName])) {
$info = $lb->parentInfo();
$pos = $this->startupPositions[$masterName];
wfDebug(__METHOD__ . ": LB " . $info['id'] . " waiting for master pos {$pos}\n");
$lb->waitFor($pos);
}
}
/**
* Initialise a LoadBalancer to give it appropriate chronology protection.
*
* @param LoadBalancer $lb
*/
function initLB($lb)
{
if ($this->startupPos === null) {
if (!empty($_SESSION[__CLASS__])) {
$this->startupPos = $_SESSION[__CLASS__];
}
}
if (!$this->startupPos) {
return;
}
$masterName = $lb->getServerName(0);
if ($lb->getServerCount() > 1 && !empty($this->startupPos[$masterName])) {
$info = $lb->parentInfo();
$pos = $this->startupPos[$masterName];
wfDebug(__METHOD__ . ": LB " . $info['id'] . " waiting for master pos {$pos}\n");
$lb->waitFor($this->startupPos[$masterName]);
}
}
/**
* Initialise a LoadBalancer to give it appropriate chronology protection.
*
* If the stash has a previous master position recorded, this will try to
* make sure that the next query to a slave of that master will see changes up
* to that position by delaying execution. The delay may timeout and allow stale
* data if no non-lagged slaves are available.
*
* @param LoadBalancer $lb
* @return void
*/
public function initLB(LoadBalancer $lb)
{
if (!$this->enabled || $lb->getServerCount() <= 1) {
return;
// non-replicated setup or disabled
}
$this->initPositions();
$masterName = $lb->getServerName($lb->getWriterIndex());
if (!empty($this->startupPositions[$masterName])) {
$info = $lb->parentInfo();
$pos = $this->startupPositions[$masterName];
wfDebugLog('replication', __METHOD__ . ": LB '" . $info['id'] . "' waiting for master pos {$pos}\n");
$lb->waitFor($pos);
}
}
