From bf018e723777d8fa5851657dd6d395249509b90d Mon Sep 17 00:00:00 2001
From: He Xiaoqiao <hexiaoqiao@apache.org>
Date: Thu, 25 Mar 2021 12:24:14 +0800
Subject: [PATCH] HDFS-15919. BlockPoolManager should log stack trace if unable
 to get Namenode addresses. Contributed by Stephen O'Donnell.

---
 .../apache/hadoop/hdfs/server/datanode/BlockPoolManager.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
index 390577f8b5..95bc2d6c23 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
@@ -158,7 +158,7 @@ void refreshNamenodes(Configuration conf)
       newLifelineAddressMap =
           DFSUtil.getNNLifelineRpcAddressesForCluster(conf);
     } catch (IOException ioe) {
-      LOG.warn("Unable to get NameNode addresses.");
+      LOG.warn("Unable to get NameNode addresses.", ioe);
     }
 
     if (newAddressMap == null || newAddressMap.isEmpty()) {