Scaling MongoDB Workshop

• local: No guarantees

• available: No guarantees

• majority: Returns data acknowledged by a majority of the nodes

• lineralizable: Returns data acknowledged by a majority of the nodes, completed before the start of the read operation


<?php
$m = new \MongoDB\Client(
    'mongodb://localhost:13000/?replicaSet=poiset'
);

$rc = new MongoDB\Driver\ReadConcern( MongoDB\Driver\ReadConcern::LINEARIZABLE );

$m->demo->test->find( $query, [ 'readConcern' => $rc, 'maxTimeMS' => 200 ] );
?>