wikimedia / mediawiki

		$values = []; // array of (key => value)

		$keysByTable = [];

		foreach ( $keys as $key ) {

			list( $serverIndex, $tableName ) = $this->getTableByKey( $key );

			$keysByTable[$serverIndex][$tableName][] = $key;

		}

		$this->garbageCollect(); // expire old entries if any

	public function setMulti( array $data, $expiry = 0 ) {

		$keysByTable = [];

		foreach ( $data as $key => $value ) {

			list( $serverIndex, $tableName ) = $this->getTableByKey( $key );

			$keysByTable[$serverIndex][$tableName][] = $key;

		}

		$this->garbageCollect(); // expire old entries if any