PHP MongoDB inconsistent results with query on MongoDate - php

Question

I'm running a very basic script on a sharded MongoDb setup to select the number of messages on a given day.
However, running this multiple times, results in inconsistent results, sometimes it returns the number, sometimes it just returns 0.
The mongodb server has version 2.4.3
Am I missing something here?
This is the script:
<?php
$mongo = new MongoClient("mongodb://127.0.0.1:27017");
$db = $mongo->selectDB('database');
$messages = $db->selectCollection('messages');
$date1 = new MongoDate(strtotime('2013-10-20'));
$date2 = new MongoDate(strtotime('2013-10-21'));
var_dump($date1);
var_dump($date2);
$iterator = $messages->find(array('date_replied' => array('$gte' => $date1, '$lt' => $date2)));
$count = $iterator->count();
var_dump($count);
And this is the result, 2 times ran directly after each other:
~$ php -f mongo.php
object(MongoDate)#4 (2) {
["sec"]=>
int(1382220000)
["usec"]=>
int(0)
}
object(MongoDate)#5 (2) {
["sec"]=>
int(1382306400)
["usec"]=>
int(0)
}
int(494921)
~$ php -f mongo.php
object(MongoDate)#4 (2) {
["sec"]=>
int(1382220000)
["usec"]=>
int(0)
}
object(MongoDate)#5 (2) {
["sec"]=>
int(1382306400)
["usec"]=>
int(0)
}
int(0)

Answer 1

Your database might be corrupt. Can you do a db.repairDatabase() and try again? It this fails try to re-create the index, I had similar issues with distributed collections.
Please keep in mind that repairing will block the whole database operations and might throw away any corrupted data. Proceed with care!