HDFS-12588. Use GenericOptionsParser for scm and ksm daemon. Contributed by Elek, Marton.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/ksm/KeySpaceManager.java

@@ -48,6 +48,7 @@
 import org.apache.hadoop.scm.protocolPB.ScmBlockLocationProtocolClientSideTranslatorPB;
 import org.apache.hadoop.scm.protocolPB.ScmBlockLocationProtocolPB;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.GenericOptionsParser;
 import org.apache.hadoop.util.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -89,6 +90,7 @@ public class KeySpaceManager extends ServiceRuntimeInfoImpl
   private final KSMMetrics metrics;
   private final KeySpaceManagerHttpServer httpServer;
   private ObjectName ksmInfoBeanName;
+  private static final String USAGE = "hdfs ksm [genericOptions]";
 
   public KeySpaceManager(OzoneConfiguration conf) throws IOException {
     final int handlerCount = conf.getInt(OZONE_KSM_HANDLER_COUNT_KEY,
@@ -191,14 +193,25 @@ public KSMMetrics getMetrics() {
    * @throws IOException if startup fails due to I/O error
    */
   public static void main(String[] argv) throws IOException {
-    StringUtils.startupShutdownMessage(KeySpaceManager.class, argv, LOG);
+    if (DFSUtil.parseHelpArgument(argv, USAGE,
+        System.out, true)) {
+      System.exit(0);
+    }
     try {
       OzoneConfiguration conf = new OzoneConfiguration();
+      GenericOptionsParser hParser = new GenericOptionsParser(conf, argv);
+      if (!hParser.isParseSuccessful()
+          || hParser.getRemainingArgs().length > 0) {
+        System.err.println("USAGE: " + USAGE + " \n");
+        hParser.printGenericCommandUsage(System.err);
+        System.exit(1);
+      }
       if (!DFSUtil.isOzoneEnabled(conf)) {
         System.out.println("KSM cannot be started in secure mode or when " +
             OZONE_ENABLED + " is set to false");
         System.exit(1);
       }
+      StringUtils.startupShutdownMessage(KeySpaceManager.class, argv, LOG);
       KeySpaceManager ksm = new KeySpaceManager(conf);
       ksm.start();
       ksm.join();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/scm/StorageContainerManager.java

@@ -91,6 +91,7 @@
 import org.apache.hadoop.ozone.common.Storage.StorageState;
 import org.apache.hadoop.ozone.scm.exceptions.SCMException.ResultCodes;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.GenericOptionsParser;
 import org.apache.hadoop.util.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -216,9 +217,12 @@ public String getName() {
 
 
   private static final String USAGE =
-      "Usage: \n hdfs scm [ " + StartupOption.INIT.getName() + " [ "
+      "Usage: \n hdfs scm [genericOptions] "
-          + StartupOption.CLUSTERID.getName() + " <cid> ] ]\n " + "hdfs scm [ "
+          + "[ " + StartupOption.INIT.getName() + " [ "
-          + StartupOption.GENCLUSTERID.getName() + " ]\n " + "hdfs scm [ "
+          + StartupOption.CLUSTERID.getName() + " <cid> ] ]\n "
+          + "hdfs scm [genericOptions] [ "
+          + StartupOption.GENCLUSTERID.getName() + " ]\n " +
+          "hdfs scm [ "
           + StartupOption.HELP.getName() + " ]\n";
   /**
    * Creates a new StorageContainerManager.  Configuration will be updated with
@@ -401,11 +405,21 @@ private void unregisterMXBean() {
    * @throws IOException if startup fails due to I/O error
    */
   public static void main(String[] argv) throws IOException {
+    if (DFSUtil.parseHelpArgument(argv, USAGE,
+        System.out, true)) {
+      System.exit(0);
+    }
+    try {
+      OzoneConfiguration conf = new OzoneConfiguration();
+      GenericOptionsParser hParser = new GenericOptionsParser(conf, argv);
+      if (!hParser.isParseSuccessful()) {
+        System.err.println("USAGE: " + USAGE + "\n");
+        hParser.printGenericCommandUsage(System.err);
+        System.exit(1);
+      }
       StringUtils.startupShutdownMessage(StorageContainerManager.class,
           argv, LOG);
-    OzoneConfiguration conf = new OzoneConfiguration();
+      StorageContainerManager scm = createSCM(hParser.getRemainingArgs(), conf);
-    try {
-      StorageContainerManager scm = createSCM(argv, conf);
       if (scm != null) {
         scm.start();
         scm.join();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/scm/cli/SCMCLI.java

@@ -162,7 +162,7 @@ protected void displayHelp() {
     HelpFormatter helpFormatter = new HelpFormatter();
     Options topLevelOptions = new Options();
     addTopLevelOptions(topLevelOptions);
-    helpFormatter.printHelp(CMD_WIDTH, "hdfs scm <commands> [<options>]",
+    helpFormatter.printHelp(CMD_WIDTH, "hdfs scmcli <commands> [<options>]",
         "where <commands> can be one of the following",
         topLevelOptions, "");
   }