From 4b7e256cc6072de1bb898314a58a0ca0c997df2f Mon Sep 17 00:00:00 2001
From: Puleya7 <liyong1214@gmail.com>
Date: Sat, 18 May 2019 17:17:38 +0800
Subject: [PATCH] HBASE-22440. Override getWalGroupsReplicationStatus to avoid
 NPE

Signed-off-by: Duo Zhang <zhangduo@apache.org>
---
 .../java/org/apache/hadoop/hbase/master/HMaster.java     | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
index 99e677b2c4c..58fd5df6feb 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
@@ -183,6 +183,7 @@ import org.apache.hadoop.hbase.replication.ReplicationUtils;
 import org.apache.hadoop.hbase.replication.master.ReplicationHFileCleaner;
 import org.apache.hadoop.hbase.replication.master.ReplicationLogCleaner;
 import org.apache.hadoop.hbase.replication.master.ReplicationPeerConfigUpgrader;
+import org.apache.hadoop.hbase.replication.regionserver.ReplicationStatus;
 import org.apache.hadoop.hbase.security.AccessDeniedException;
 import org.apache.hadoop.hbase.security.UserProvider;
 import org.apache.hadoop.hbase.trace.TraceUtil;
@@ -3851,4 +3852,12 @@ public class HMaster extends HRegionServer implements MasterServices {
       }
     }
   }
+
+  @Override
+  public Map<String, ReplicationStatus> getWalGroupsReplicationStatus() {
+    if (!this.isOnline() || !LoadBalancer.isMasterCanHostUserRegions(conf)) {
+      return new HashMap<>();
+    }
+    return super.getWalGroupsReplicationStatus();
+  }
 }