HDFS-6003. Add the new -rollingUpgrade startup option to the namenode usage message. Contributed by Vinayakumar B

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1571596 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES_HDFS-5535.txt

@@ -85,3 +85,6 @@ HDFS-5535 subtasks:
     HDFS-5583. Make DN send an OOB Ack on shutdown before restarting. (kihwal)
 
     HDFS-5778. Add rolling upgrade user document. (szetszwo)
+
+    HDFS-6003. Add the new -rollingUpgrade startup option to the namenode
+    usage message. (Vinayakumar B via szetszwo)

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

@@ -21,6 +21,7 @@ import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.HadoopIllegalArgumentException;
@@ -40,6 +41,7 @@ import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NamenodeRole;
+import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.RollingUpgradeStartupOption;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
 import org.apache.hadoop.hdfs.server.namenode.ha.*;
 import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
@@ -64,6 +66,7 @@ import org.apache.hadoop.util.ServicePlugin;
 import org.apache.hadoop.util.StringUtils;
 
 import javax.management.ObjectName;
+
 import java.io.IOException;
 import java.io.PrintStream;
 import java.net.InetSocketAddress;
@@ -205,6 +208,9 @@ public class NameNode implements NameNodeStatusMXBean {
         " [" + StartupOption.CLUSTERID.getName() + " cid]" +
         " [" + StartupOption.RENAMERESERVED.getName() + "<k-v pairs>] ] | ["
       + StartupOption.ROLLBACK.getName() + "] | ["
+      + StartupOption.ROLLINGUPGRADE.getName() + " <"
+      + RollingUpgradeStartupOption.DOWNGRADE.name().toLowerCase() + "|"
+      + RollingUpgradeStartupOption.ROLLBACK.name().toLowerCase() + "> ] | ["
       + StartupOption.FINALIZE.getName() + "] | ["
       + StartupOption.IMPORT.getName() + "] | ["
       + StartupOption.INITIALIZESHAREDEDITS.getName() + "] | ["