HDFS-7890. Improve information on Top users for metrics in RollingWindowsManager and lower log level (Contributed by J.Andreina)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -353,6 +353,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-6408. Remove redundant definitions in log4j.properties.
     (Abhiraj Butala via aajisaka)
 
+    HDFS-7890. Improve information on Top users for metrics in
+    RollingWindowsManager and lower log level (J.Andreina via vinayakumarb)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/top/window/RollingWindowManager.java

@@ -245,7 +245,7 @@ public class RollingWindowManager {
           metricName, userName, windowSum);
       topN.offer(new NameValuePair(userName, windowSum));
     }
-    LOG.info("topN size for command {} is: {}", metricName, topN.size());
+    LOG.debug("topN users size for command {} is: {}", metricName, topN.size());
     return topN;
   }