HDFS-13239. Fix non-empty dir warning message when setting default EC policy. Contributed by Bharat Viswanadham.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/ECAdmin.java

@@ -358,17 +358,15 @@ public class ECAdmin extends Configured implements Tool {
       try {
         dfs.setErasureCodingPolicy(p, ecPolicyName);
         if (ecPolicyName == null){
-          System.out.println("Set default erasure coding policy" +
-              " on " + path);
-        } else {
-          System.out.println("Set erasure coding policy " + ecPolicyName +
-              " on " + path);
+          ecPolicyName = "default";
         }
+        System.out.println("Set " + ecPolicyName + " erasure coding policy on" +
+            " " + path);
         RemoteIterator<FileStatus> dirIt = dfs.listStatusIterator(p);
         if (dirIt.hasNext()) {
           System.out.println("Warning: setting erasure coding policy on a " +
-              "non-empty directory will not automatically convert existing" +
-              " files to " + ecPolicyName);
+              "non-empty directory will not automatically convert existing " +
+              "files to " + ecPolicyName + " erasure coding policy");
         }
       } catch (Exception e) {
         System.err.println(AdminHelper.prettifyException(e));

hadoop-hdfs-project/hadoop-hdfs/src/test/resources/testErasureCodingConf.xml

@@ -214,7 +214,7 @@
       <comparators>
         <comparator>
           <type>SubstringComparator</type>
-          <expected-output>Set erasure coding policy RS-6-3-1024k on /ecdir</expected-output>
+          <expected-output>Set RS-6-3-1024k erasure coding policy on /ecdir</expected-output>
         </comparator>
       </comparators>
     </test>
@@ -232,7 +232,7 @@
       <comparators>
         <comparator>
           <type>SubstringComparator</type>
-          <expected-output>Set erasure coding policy RS-6-3-1024k on /ecdir</expected-output>
+          <expected-output>Set RS-6-3-1024k erasure coding policy on /ecdir</expected-output>
         </comparator>
       </comparators>
     </test>
@@ -311,7 +311,7 @@
       <comparators>
         <comparator>
           <type>SubstringComparator</type>
-          <expected-output>Warning: setting erasure coding policy on a non-empty directory will not automatically convert existing files to RS-6-3-1024</expected-output>
+          <expected-output>Warning: setting erasure coding policy on a non-empty directory will not automatically convert existing files to RS-6-3-1024k erasure coding policy</expected-output>
         </comparator>
       </comparators>
     </test>
@@ -695,6 +695,28 @@
       </comparators>
     </test>
 
+    <test>
+      <description>setPolicy : set erasure coding policy without given a specific policy name on a non empty directory</description>
+      <test-commands>
+        <command>-fs NAMENODE -mkdir /ecdir</command>
+        <command>-fs NAMENODE -mkdir /ecdir/ecsubdir</command>
+        <ec-admin-command>-fs NAMENODE -setPolicy -path /ecdir</ec-admin-command>
+      </test-commands>
+      <cleanup-commands>
+        <command>-fs NAMENODE -rm -R /ecdir</command>
+      </cleanup-commands>
+      <comparators>
+        <comparator>
+          <type>SubstringComparator</type>
+          <expected-output>Set default erasure coding policy on /ecdir</expected-output>
+        </comparator>
+        <comparator>
+          <type>SubstringComparator</type>
+          <expected-output>Warning: setting erasure coding policy on a non-empty directory will not automatically convert existing files to default erasure coding policy</expected-output>
+        </comparator>
+      </comparators>
+    </test>
+
     <test>
       <description>getPolicy: get the default policy after setPolicy without given a specific policy name</description>
       <test-commands>