HDFS-6230. Expose upgrade status through NameNode web UI. Contributed by Mit Desai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1594040 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -348,6 +348,9 @@ Release 2.5.0 - UNRELEASED
 
     HDFS-6328. Clean up dead code in FSDirectory. (wheat9)
 
+    HDFS-6230. Expose upgrade status through NameNode web UI.
+    (Mit Desai via wheat9)
+
   OPTIMIZATIONS
 
     HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfshealth.html

@@ -72,7 +72,7 @@
 <script type="text/x-dust-template" id="tmpl-dfshealth">
 
 {#nn}
-{@if cond="{DistinctVersionCount} > 1 || '{RollingUpgradeStatus}'.length"}
+{@if cond="{DistinctVersionCount} > 1 || '{RollingUpgradeStatus}'.length || !'{UpgradeFinalized}'"}
 <div class="alert alert-dismissable alert-info">
   <button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>
 
@@ -92,6 +92,10 @@
     {key} ({value}) {@sep},{/sep}
     {/DistinctVersions}
   {/if}
+
+  {^UpgradeFinalized}
+     <p>Upgrade in progress. Not yet finalized.</p>
+  {/UpgradeFinalized}
 </div>
 {/if}