From bc6ecb5b612ff2e12e99294699a0f11a86c5c23c Mon Sep 17 00:00:00 2001
From: Logan Hanks <logan@reddit.com>
Date: Thu, 10 Nov 2011 11:55:58 -0800
Subject: [PATCH] Add a separate sample rate for relatively spammy cache stats.

---
 r2/r2/lib/stats.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/r2/r2/lib/stats.py b/r2/r2/lib/stats.py
index c2db3ae8d..4b2d65606 100644
--- a/r2/r2/lib/stats.py
+++ b/r2/r2/lib/stats.py
@@ -1,9 +1,14 @@
+import random
 import time
 
 from r2.lib import cache
 from r2.lib import utils
 
 class Stats:
+    # Sample rate for recording cache hits/misses, relative to the global
+    # sample_rate.
+    CACHE_SAMPLE_RATE = 0.01
+
     def __init__(self, addr, sample_rate):
         if addr:
             import statsd
@@ -38,7 +43,7 @@ class Stats:
 
     def cache_count(self, name, delta=1):
         counter = self.get_counter('cache')
-        if counter:
+        if counter and random.random() < self.CACHE_SAMPLE_RATE:
             counter.increment(name, delta=delta)
 
     def amqp_processor(self, processor):