Index: hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java =================================================================== --- hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java (revision 1471284) +++ hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/MetricsMBeanBase.java (working copy) @@ -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 @@ /** HBase MetricsBase implementations that MetricsDynamicMBeanBase does * not understand */ - protected Map extendedAttributes = - new HashMap(); + protected Map extendedAttributes = + new ConcurrentHashMap(); protected MBeanInfo extendedInfo; protected MetricsMBeanBase( MetricsRegistry mr, String description ) {