HDFS-6559: Merging r1603638 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1603639 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -407,6 +407,9 @@ Release 2.5.0 - UNRELEASED
     HDFS-6439. NFS should not reject NFS requests to the NULL procedure whether
     port monitoring is enabled or not. (brandonli)
 
+    HDFS-6559. Fix wrong option "dfsadmin -rollingUpgrade start" in the
+    document. (Akira Ajisaka via Arpit Agarwal)
+
   BREAKDOWN OF HDFS-2006 SUBTASKS AND RELATED JIRAS
 
     HDFS-6299. Protobuf for XAttr and client-side implementation. (Yi Liu via umamahesh)

hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml

@@ -217,7 +217,7 @@
     
   <subsection name="DFSAdmin Commands" id="dfsadminCommands">
   <h4><code>dfsadmin -rollingUpgrade</code></h4>
-  <source>hdfs dfsadmin -rollingUpgrade &lt;query|start|finalize&gt;</source>
+  <source>hdfs dfsadmin -rollingUpgrade &lt;query|prepare|finalize&gt;</source>
   <p>
     Execute a rolling upgrade action.
     <ul><li>Options:<table>