From 0b081303b949508caace40218c1a16d8ba59885d Mon Sep 17 00:00:00 2001
From: tedyu <yuzhihong@gmail.com>
Date: Sat, 22 Aug 2015 14:50:57 -0700
Subject: [PATCH] HBASE-14291 NPE On StochasticLoadBalancer Balance Involving
 RS With No Regions

---
 .../hadoop/hbase/master/balancer/BaseLoadBalancer.java    | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java
index 8a7f7dcc6d2..7199ffee382 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java
@@ -858,7 +858,13 @@ public abstract class BaseLoadBalancer implements LoadBalancer {
         int leastLoadedServerIndex = -1;
         int load = Integer.MAX_VALUE;
         for (ServerName sn : topLocalServers) {
-          int index = serversToIndex.get(sn);
+          if (!serversToIndex.containsKey(sn.getHostAndPort())) {
+            continue;
+          }
+          int index = serversToIndex.get(sn.getHostAndPort());
+          if (regionsPerServer[index] == null) {
+            continue;
+          }
           int tempLoad = regionsPerServer[index].length;
           if (tempLoad <= load) {
             leastLoadedServerIndex = index;