From b93c08d358392de7617d2ae5ed50671293fc2954 Mon Sep 17 00:00:00 2001
From: Jingcheng Du <jingcheng.du@intel.com>
Date: Wed, 29 Jun 2016 16:37:23 +0800
Subject: [PATCH] HBASE-15976 RegionServerMetricsWrapperRunnable will be
 failure  when disable blockcache. - Addendum

---
 .../hbase/regionserver/MetricsRegionServerWrapperImpl.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerWrapperImpl.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerWrapperImpl.java
index 7e6d87c4856..35fd1aeaafa 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerWrapperImpl.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerWrapperImpl.java
@@ -317,6 +317,9 @@ class MetricsRegionServerWrapperImpl
 
   @Override
   public long getBlockCacheFailedInsertions() {
+    if (this.cacheStats == null) {
+      return 0;
+    }
     return this.cacheStats.getFailedInserts();
   }