From 64e739e344ac474046d4f4ecf0865dd92be13762 Mon Sep 17 00:00:00 2001
From: Anu Engineer <aengineer@apache.org>
Date: Fri, 27 Jul 2018 06:11:56 -0700
Subject: [PATCH] HDFS-13727. Log full stack trace if DiskBalancer exits with
 an unhandled exception. Contributed by Gabor Bota.

---
 .../java/org/apache/hadoop/hdfs/tools/DiskBalancerCLI.java    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DiskBalancerCLI.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DiskBalancerCLI.java
index 00e6f0499a9..34bd68bc684 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DiskBalancerCLI.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DiskBalancerCLI.java
@@ -172,7 +172,9 @@ public class DiskBalancerCLI extends Configured implements Tool {
     try {
       res = ToolRunner.run(shell, argv);
     } catch (Exception ex) {
-      LOG.error(ex.toString());
+      String msg = String.format("Exception thrown while running %s.",
+          DiskBalancerCLI.class.getSimpleName());
+      LOG.error(msg, ex);
       res = 1;
     }
     System.exit(res);