From a855db21705fcf2019193161452d2c041985963c Mon Sep 17 00:00:00 2001
From: fjy <fangjin@metamarkets.com>
Date: Fri, 8 Aug 2014 10:53:10 -0700
Subject: [PATCH] make things immutable

---
 .../main/java/io/druid/server/router/TieredBrokerConfig.java   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/server/src/main/java/io/druid/server/router/TieredBrokerConfig.java b/server/src/main/java/io/druid/server/router/TieredBrokerConfig.java
index 7d8d5bb17b7..11e8ac67181 100644
--- a/server/src/main/java/io/druid/server/router/TieredBrokerConfig.java
+++ b/server/src/main/java/io/druid/server/router/TieredBrokerConfig.java
@@ -20,6 +20,7 @@
 package io.druid.server.router;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import io.druid.client.DruidServer;
 import org.joda.time.Period;
@@ -100,6 +101,6 @@ public class TieredBrokerConfig
 
   public List<TieredBrokerSelectorStrategy> getStrategies()
   {
-    return strategies;
+    return ImmutableList.copyOf(strategies);
   }
 }