From 4ecbd22c1907cd2adcbb83726ee9db36b9710ec0 Mon Sep 17 00:00:00 2001
From: Glenn Maynard <glenn@zewt.org>
Date: Sun, 10 Jun 2012 12:28:19 -0400
Subject: [PATCH] Initialize ObjectId._inc to a random value.

This is required to prevent collisions on very large clusters.  See
https://groups.google.com/forum/?fromgroups#!topic/mongodb-user/ajgO9wUxbos
for details.  Other drivers also initialize this field to a random value.
---
 bson/objectid.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bson/objectid.py b/bson/objectid.py
index ee1364ea0..36fac79bb 100644
--- a/bson/objectid.py
+++ b/bson/objectid.py
@@ -26,6 +26,7 @@ except ImportError:  # for Python < 2.5
     import md5
     _md5func = md5.new
 import os
+import random
 import socket
 import struct
 import threading
@@ -51,7 +52,7 @@ class ObjectId(object):
     """A MongoDB ObjectId.
     """
 
-    _inc = 0
+    _inc = random.randint(0, 0xFFFFFF)
     _inc_lock = threading.Lock()
 
     _machine_bytes = _machine_bytes()