From e12e470d5fb51b420968a8b09daa24398abd4535 Mon Sep 17 00:00:00 2001
From: Zhihong Yu <tedyu@apache.org>
Date: Sun, 28 Apr 2013 03:12:19 +0000
Subject: [PATCH] HBASE-8451 MetricsMBeanBase has concurrency issues in init
 (Liang Xie)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1476713 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java   | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java
index cd5c48a84d4..372115baa68 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java
@@ -19,9 +19,9 @@
 package org.apache.hadoop.hbase.metrics;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 import javax.management.AttributeNotFoundException;
 import javax.management.MBeanAttributeInfo;
@@ -57,8 +57,8 @@ public class MetricsMBeanBase extends MetricsDynamicMBeanBase {
   /** HBase MetricsBase implementations that MetricsDynamicMBeanBase does
    * not understand
    */
-  protected Map<String,MetricsBase> extendedAttributes =
-      new HashMap<String,MetricsBase>();
+  protected Map<String, MetricsBase> extendedAttributes =
+      new ConcurrentHashMap<String, MetricsBase>();
   protected MBeanInfo extendedInfo;
 
   protected MetricsMBeanBase( MetricsRegistry mr, String description ) {