I am developing a website using PHP and mongodb. I access the mongodb with PECL-mongo, and have run into an annoyance. Every now and then, I get an error like this (I've anonymized the paths)
Fatal error: Uncaught exception 'MongoCursorException' with message 'couldn't get response header' in
/PATH/index.php:38 Stack trace: #0
/PATH/index.php(38): MongoCursor->rewind() #1
/PATH/template.inc(29): get_sidebar() #2
/PATH/index.php(13):
require_once('PATH/...') #3 {main} thrown in PATH/index.php on line 38
According to the documentation, this means:
The driver could not fetch a reply header from the database, so it gave up. Check if the database is still up and the network is connected and try the query again.
But I know that the database is up because I am doing this locally on my own machine over loopback. No connection is made to the outside world.
Simply trying again often works. Is this a possibly a bug in PHP's driver for mongo? Could this be a "miscompile" issue (I compiled from source, but with very benign flags, -march=native -O2)?
Has anyone seen this before?
Searching around, I only see references to some stupid facebook game having the same error.
EDIT: I just downgraded my PECL driver to version 1.1.4 and so far, the problem seems have gone away. So this may simply be a bug in the 1.2.x series. If anyone can shed any light on it, that would be great.
EDIT: I am not doing anything complex here, the code that is having the issue litterally looks like this:
$m = new Mongo();
$collection = $m->my_db->collection;
$results = $collection->find(array("favorite"=>true))->limit(5);