From 89688d4a43f241a8e98d277f9cd7f1b20eaf68af Mon Sep 17 00:00:00 2001
From: tedyu <yuzhihong@gmail.com>
Date: Tue, 12 May 2015 09:04:56 -0700
Subject: [PATCH] HBASE-13663 HMaster fails to restart 'HMaster: Failed to
 become active master'

---
 .../java/org/apache/hadoop/hbase/master/AssignmentManager.java   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
index eae99991474..0fe59a632ad 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
@@ -1653,6 +1653,7 @@ public class AssignmentManager {
       HRegionLocation[] locations = rl.getRegionLocations();
       if (locations == null) continue;
       for (HRegionLocation hrl : locations) {
+        if (hrl == null) continue;
         HRegionInfo regionInfo = hrl.getRegionInfo();
         if (regionInfo == null) continue;
         int replicaId = regionInfo.getReplicaId();