shahrs87 commented on a change in pull request #1962:
URL: https://github.com/apache/hbase/pull/1962#discussion_r454507461



##########
File path: 
hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableRangeHistogram.java
##########
@@ -80,7 +80,7 @@ public void updateSnapshotRangeMetrics(MetricsRecordBuilder 
metricsRecordBuilder
     long val = snapshot.getCount();
     if (val - cumNum > 0) {
       metricsRecordBuilder.addCounter(
-          Interns.info(name + "_" + rangeType + "_" + ranges[ranges.length - 
1] + "-inf", desc),
+          Interns.info(name + "_" + rangeType + "_" + priorRange + "-inf", 
desc),

Review comment:
       >  Is it possible that ranges[] can be empty?
   No. It is hardcoded in 
https://github.com/apache/hbase/blob/master/hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableSizeHistogram.java#L31
 and  
https://github.com/apache/hbase/blob/master/hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableTimeHistogram.java#L31

##########
File path: 
hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableRangeHistogram.java
##########
@@ -80,7 +80,7 @@ public void updateSnapshotRangeMetrics(MetricsRecordBuilder 
metricsRecordBuilder
     long val = snapshot.getCount();
     if (val - cumNum > 0) {
       metricsRecordBuilder.addCounter(
-          Interns.info(name + "_" + rangeType + "_" + ranges[ranges.length - 
1] + "-inf", desc),
+          Interns.info(name + "_" + rangeType + "_" + priorRange + "-inf", 
desc),

Review comment:
       >  Is it possible that ranges[] can be empty?
   
   No. It is hardcoded in 
https://github.com/apache/hbase/blob/master/hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableSizeHistogram.java#L31
 and  
https://github.com/apache/hbase/blob/master/hbase-hadoop-compat/src/main/java/org/apache/hadoop/metrics2/lib/MutableTimeHistogram.java#L31




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