HDFS-3612. Single namenode image directory config warning can be improved. Contributed by Andy Isaacson. (harsh)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1361059 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -316,6 +316,9 @@ Branch-2 ( Unreleased changes )
     HDFS-3306. fuse_dfs: don't lock release operations.
     (Colin Patrick McCabe via eli)
 
+    HDFS-3612. Single namenode image directory config warning can
+    be improved. (Andy Isaacson via harsh)
+
   OPTIMIZATIONS
 
     HDFS-2982. Startup performance suffers when there are many edit log

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -393,12 +393,14 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
       throws IOException {
 
     if (namespaceDirs.size() == 1) {
-      LOG.warn("Only one " + DFS_NAMENODE_NAME_DIR_KEY
-          + " directory configured , beware data loss!");
+      LOG.warn("Only one image storage directory ("
+          + DFS_NAMENODE_NAME_DIR_KEY + ") configured. Beware of dataloss"
+          + " due to lack of redundant storage directories!");
     }
     if (namespaceEditsDirs.size() == 1) {
-      LOG.warn("Only one " + DFS_NAMENODE_EDITS_DIR_KEY
-          + " directory configured , beware data loss!");
+      LOG.warn("Only one namespace edits storage directory ("
+          + DFS_NAMENODE_EDITS_DIR_KEY + ") configured. Beware of dataloss"
+          + " due to lack of redundant storage directories!");
     }
 
     FSImage fsImage = new FSImage(conf, namespaceDirs, namespaceEditsDirs);