From b41e645ea3c3bfb03a7cc5e138ce4f727d7a3c2e Mon Sep 17 00:00:00 2001
From: Jonathan Ellis <jbellis@apache.org>
Date: Thu, 22 Dec 2011 20:41:30 +0000
Subject: [PATCH] avoid logging (harmless) exception when GC takes < 1ms patch
 by jbellis; reviewed by brandonwilliams for CASSANDRA-3656

git-svn-id: https://svn.apache.org/repos/asf/cassandra/branches/cassandra-1.0@1222437 13f79535-47bb-0310-9956-ffa450edef68
---
 CHANGES.txt                                            | 1 +
 src/java/org/apache/cassandra/service/GCInspector.java | 3 +--
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/CHANGES.txt b/CHANGES.txt
index 0d153434ed..c72bf69c28 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 1.0.7
+ * avoid logging (harmless) exception when GC takes < 1ms (CASSANDRA-3656)
  * add nodetool setstreamthroughput (CASSANDRA-3571)
  * fix assertion when dropping a columnfamily with no sstables (CASSANDRA-3614)
  * more efficient allocation of small bloom filters (CASSANDRA-3618)
diff --git a/src/java/org/apache/cassandra/service/GCInspector.java b/src/java/org/apache/cassandra/service/GCInspector.java
index 70fd99b440..46357ca1c4 100644
--- a/src/java/org/apache/cassandra/service/GCInspector.java
+++ b/src/java/org/apache/cassandra/service/GCInspector.java
@@ -99,8 +99,7 @@ public class GCInspector
             if (previousTotal.equals(total))
                 continue;
             gctimes.put(gc.getName(), total);
-            Long duration = total - previousTotal;
-            assert duration > 0;
+            Long duration = total - previousTotal; // may be zero for a really fast collection
 
             Long previousCount = gccounts.get(gc.getName());
             Long count = gc.getCollectionCount();