From 92fdc8dd51156d1b21424f227fa19105a50b425b Mon Sep 17 00:00:00 2001
From: haxiaolin <linkaline11@gmail.com>
Date: Wed, 15 Aug 2018 11:15:46 +0800
Subject: [PATCH] HBASE-21055 NullPointerException when balanceOverall() but
 server balance info is null

Signed-off-by: huzheng <openinx@gmail.com>
---
 .../hadoop/hbase/master/balancer/SimpleLoadBalancer.java       | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.java
index b0d3f19ad18..89de13bb78d 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.java
@@ -479,6 +479,9 @@ public class SimpleLoadBalancer extends BaseLoadBalancer {
     for (int i = 0; i < serverLoadList.size(); i++) {
       ServerAndLoad serverload = serverLoadList.get(i);
       BalanceInfo balanceInfo = serverBalanceInfo.get(serverload.getServerName());
+      if (balanceInfo == null) {
+        continue;
+      }
       setLoad(serverLoadList, i, balanceInfo.getNumRegionsAdded());
       if (balanceInfo.getHriList().size() + balanceInfo.getNumRegionsAdded() == max) {
         RegionInfo hriToPlan;