From b61b48999530851da177db2e8998858ffc01f77e Mon Sep 17 00:00:00 2001
From: Xiaoyu Yao <xyao@apache.org>
Date: Sat, 6 Jun 2015 18:47:45 -0700
Subject: [PATCH] HDFS-8116. Cleanup uncessary if LOG.isDebugEnabled() from
 RollingWindowManager. Contributed by Brahma Reddy Battula.

---
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt               | 3 +++
 .../server/namenode/top/window/RollingWindowManager.java  | 8 +++-----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index f7f7f9810f7..21f587fd2d6 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -606,6 +606,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8432. Introduce a minimum compatible layout version to allow downgrade
     in more rolling upgrade use cases. (cnauroth)
 
+    HDFS-8116. Cleanup uncessary if LOG.isDebugEnabled() from
+    RollingWindowManager. (Brahma Reddy Battula via xyao)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/top/window/RollingWindowManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/top/window/RollingWindowManager.java
index 4759cc8ca5d..63438ff4156 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/top/window/RollingWindowManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/top/window/RollingWindowManager.java
@@ -187,11 +187,9 @@ public class RollingWindowManager {
    */
   public TopWindow snapshot(long time) {
     TopWindow window = new TopWindow(windowLenMs);
-    if (LOG.isDebugEnabled()) {
-      Set<String> metricNames = metricMap.keySet();
-      LOG.debug("iterating in reported metrics, size={} values={}",
-          metricNames.size(), metricNames);
-    }
+    Set<String> metricNames = metricMap.keySet();
+    LOG.debug("iterating in reported metrics, size={} values={}",
+        metricNames.size(), metricNames);
     for (Map.Entry<String, RollingWindowMap> entry : metricMap.entrySet()) {
       String metricName = entry.getKey();
       RollingWindowMap rollingWindows = entry.getValue();