From ba650a8a1057dd5d77cd400cc22e717b478a5721 Mon Sep 17 00:00:00 2001
From: tedyu <yuzhihong@gmail.com>
Date: Thu, 22 Sep 2016 07:34:29 -0700
Subject: [PATCH] HBASE-16675 Average region size may be incorrect when there
 is region whose RegionLoad cannot be retrieved

---
 .../hbase/master/normalizer/SimpleRegionNormalizer.java       | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java
index acf12b4b92d..c18a49a228a 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java
@@ -124,16 +124,18 @@ public class SimpleRegionNormalizer implements RegionNormalizer {
       ", number of regions: " + tableRegions.size());
 
     long totalSizeMb = 0;
+    int acutalRegionCnt = 0;
 
     for (int i = 0; i < tableRegions.size(); i++) {
       HRegionInfo hri = tableRegions.get(i);
       long regionSize = getRegionSize(hri);
       if (regionSize > 0) {
+        acutalRegionCnt++;
         totalSizeMb += regionSize;
       }
     }
 
-    double avgRegionSize = totalSizeMb / (double) tableRegions.size();
+    double avgRegionSize = acutalRegionCnt == 0 ? 0 : totalSizeMb / (double) acutalRegionCnt;
 
     LOG.debug("Table " + table + ", total aggregated regions size: " + totalSizeMb);
     LOG.debug("Table " + table + ", average region size: " + avgRegionSize);