From c6497949e866594050153b953a85c0a1db59d2f8 Mon Sep 17 00:00:00 2001
From: cnauroth <cnauroth@apache.org>
Date: Fri, 5 Feb 2016 15:07:43 -0800
Subject: [PATCH] HDFS-9761. Rebalancer sleeps too long between iterations.
 Contributed by Mingliang Liu.

---
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt                | 3 +++
 .../org/apache/hadoop/hdfs/server/balancer/Balancer.java   | 7 +++----
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 44cbcc5575..80be32399e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -2704,6 +2704,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9601. NNThroughputBenchmark.BlockReportStats should handle
     NotReplicatedYetException on adding block (iwasakims)
 
+    HDFS-9761. Rebalancer sleeps too long between iterations
+    (Mingliang Liu via cnauroth)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
index 2bd28ab83b..927fb7fbcc 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
@@ -674,14 +674,13 @@ static int run(Collection<URI> namenodes, final BalancerParameters p,
               // must be an error statue, return.
               return r.exitStatus.getExitCode();
             }
-
-            if (!done) {
-              Thread.sleep(sleeptime);
-            }
           } else {
             LOG.info("Skipping blockpool " + nnc.getBlockpoolID());
           }
         }
+        if (!done) {
+          Thread.sleep(sleeptime);
+        }
       }
     } finally {
       for(NameNodeConnector nnc : connectors) {