Index: hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java =================================================================== --- hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java (revision 1556951) +++ hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java (working copy) @@ -421,9 +421,7 @@ */ public Map getOnlineServers() { // Presumption is that iterating the returned Map is OK. - synchronized (this.onlineServers) { - return Collections.unmodifiableMap(this.onlineServers); - } + return Collections.unmodifiableMap(this.onlineServers); }