HADOOP-2297 System.exit() Handling in hbase shell jar command

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk/src/contrib/hbase@599713 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -66,6 +66,7 @@ Trunk (unreleased changes)
                (Edward Yoon via Stack)
    HADOOP-2198 HTable should have method to return table metadata
    HADOOP-2296 hbase shell: phantom columns show up from select command
+   HADOOP-2297 System.exit() Handling in hbase shell jar command
 
 
 Release 0.15.1

src/java/org/apache/hadoop/hbase/Shell.java

@@ -27,6 +27,7 @@ import jline.ConsoleReader;
 
 import org.apache.hadoop.hbase.shell.Command;
 import org.apache.hadoop.hbase.shell.HelpCommand;
+import org.apache.hadoop.hbase.shell.ShellSecurityManager;
 import org.apache.hadoop.hbase.shell.ReturnMsg;
 import org.apache.hadoop.hbase.shell.TableFormatterFactory;
 import org.apache.hadoop.hbase.shell.generated.ParseException;
@@ -63,23 +64,22 @@ public class Shell {
         " sec)":
       "";
   }
-
  
   /**
    * Main method
    * @param args not used
    * @throws IOException
    */
-  public static void main(@SuppressWarnings("unused") String args[])
+  public static void main(String args[])  throws IOException {
-  throws IOException {
     HBaseConfiguration conf = new HBaseConfiguration();
     ConsoleReader reader = new ConsoleReader();
+    System.setSecurityManager(new ShellSecurityManager());
     reader.setBellEnabled(conf.getBoolean("hbaseshell.jline.bell.enabled",
       DEFAULT_BELL_ENABLED));
     Writer out = new OutputStreamWriter(System.out, "UTF-8");
     TableFormatterFactory tff = new TableFormatterFactory(out, conf);
     HelpCommand help = new HelpCommand(out, tff.get());
-    help.printVersion();
+    if(args.length == 0) help.printVersion();
     StringBuilder queryStr = new StringBuilder();
     String extendedLine;
     while ((extendedLine = reader.readLine(getPrompt(queryStr))) != null) {
@@ -91,16 +91,16 @@ public class Shell {
         try {
           Command cmd = parser.terminatedCommand();
           if (cmd != null) {
-            rs = cmd.execute(conf);
+              rs = cmd.execute(conf);
           }
-        } catch (ParseException pe) {
+        }  catch (ParseException pe) {
           String[] msg = pe.getMessage().split("[\n]");
           System.out.println("Syntax error : Type 'help;' for usage.\nMessage : " + msg[0]);
         } catch (TokenMgrError te) {
           String[] msg = te.getMessage().split("[\n]");
           System.out.println("Lexical error : Type 'help;' for usage.\nMessage : " + msg[0]);
-        }
+        } 
-
+        
         long end = System.currentTimeMillis();
         if (rs != null && rs.getType() > -1)
           System.out.println(rs.getMsg()

src/java/org/apache/hadoop/hbase/shell/AlterCommand.java

@@ -36,10 +36,12 @@ import org.apache.hadoop.io.Text;
  * Alters tables.
  */
 public class AlterCommand extends SchemaModificationCommand {
-  public enum OperationType {ADD, DROP, CHANGE, NOOP}
+  public enum OperationType {
+    ADD, DROP, CHANGE, NOOP
+  }
+
   private OperationType operationType = OperationType.NOOP;
-  private Map<String, Map<String, Object>> columnSpecMap =
+  private Map<String, Map<String, Object>> columnSpecMap = new HashMap<String, Map<String, Object>>();
-    new HashMap<String, Map<String, Object>>();
   private String tableName;
   private String column; // column to be dropped
 
@@ -51,37 +53,36 @@ public class AlterCommand extends SchemaModificationCommand {
     try {
       HConnection conn = HConnectionManager.getConnection(conf);
       if (!conn.tableExists(new Text(this.tableName))) {
-        return new ReturnMsg(0, "'" + this.tableName + "' Table not found");
+        return new ReturnMsg(0, "'" + this.tableName + "'" + TABLE_NOT_FOUND);
       }
-      
+
       HBaseAdmin admin = new HBaseAdmin(conf);
       Set<String> columns = null;
       HColumnDescriptor columnDesc = null;
       switch (operationType) {
-      case ADD:
+        case ADD:
-        disableTable(admin, tableName);
+          disableTable(admin, tableName);
-        columns = columnSpecMap.keySet();
+          columns = columnSpecMap.keySet();
-        for (String c : columns) {
+          for (String c : columns) {
-          columnDesc = getColumnDescriptor(c, columnSpecMap.get(c));
+            columnDesc = getColumnDescriptor(c, columnSpecMap.get(c));
-          println("Adding " + c + " to " + tableName +
+            println("Adding " + c + " to " + tableName + "... Please wait.");
-            "... Please wait.");
+            admin.addColumn(new Text(tableName), columnDesc);
-          admin.addColumn(new Text(tableName), columnDesc);
+          }
-        }
+          enableTable(admin, tableName);
-        enableTable(admin, tableName);
+          break;
-        break;
+        case DROP:
-      case DROP:
+          disableTable(admin, tableName);
-        disableTable(admin, tableName);
+          println("Dropping " + column + " from " + tableName
-        println("Dropping " + column + " from " + tableName +
+              + "... Please wait.");
-          "... Please wait.");
+          column = appendDelimiter(column);
-        column = appendDelimiter(column);
+          admin.deleteColumn(new Text(tableName), new Text(column));
-        admin.deleteColumn(new Text(tableName), new Text(column));
+          enableTable(admin, tableName);
-        enableTable(admin, tableName);
+          break;
-        break;
+        case CHANGE:
-      case CHANGE:
+          // Not yet supported
-        // Not yet supported
+          return new ReturnMsg(0, "" + operationType + " is not yet supported.");
-        return new ReturnMsg(0, "" + operationType + " is not yet supported.");
+        case NOOP:
-      case NOOP:
+          return new ReturnMsg(0, "Invalid operation type.");
-        return new ReturnMsg(0, "Invalid operation type.");
       }
       return new ReturnMsg(0, "Table altered successfully.");
     } catch (Exception e) {
@@ -135,9 +136,9 @@ public class AlterCommand extends SchemaModificationCommand {
   public void setOperationType(OperationType operationType) {
     this.operationType = operationType;
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.DDL;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/BasicCommand.java

@@ -25,20 +25,24 @@ import java.io.Writer;
 /**
  * Takes the lowest-common-denominator {@link Writer} doing its own printlns,
  * etc.
- * @see <a href="http://wiki.apache.org/lucene-hadoop/Hbase/HbaseShell">HBaseShell</a>
+ * 
+ * @see <a
+ *      href="http://wiki.apache.org/lucene-hadoop/Hbase/HbaseShell">HBaseShell</a>
  */
 public abstract class BasicCommand implements Command, CommandFactory {
   private final Writer out;
   public final String LINE_SEPARATOR = System.getProperty("line.separator");
+  public final String TABLE_NOT_FOUND = " is non-existant table.";
 
   // Shutdown constructor.
   @SuppressWarnings("unused")
   private BasicCommand() {
     this(null);
   }
-  
+
   /**
    * Constructor
+   * 
    * @param o A Writer.
    */
   public BasicCommand(final Writer o) {
@@ -48,29 +52,29 @@ public abstract class BasicCommand implements Command, CommandFactory {
   public BasicCommand getBasicCommand() {
     return this;
   }
-  
+
   /** basic commands are their own factories. */
   public Command getCommand() {
     return this;
   }
-  
+
   protected String extractErrMsg(String msg) {
     int index = msg.indexOf(":");
     int eofIndex = msg.indexOf("\n");
     return msg.substring(index + 1, eofIndex);
   }
-  
+
   protected String extractErrMsg(Exception e) {
     return extractErrMsg(e.getMessage());
   }
- 
+
   /**
-   * Appends, if it does not exist, a delimiter (colon) 
+   * Appends, if it does not exist, a delimiter (colon) at the end of the column
-   * at the end of the column name.
+   * name.
    */
   protected String appendDelimiter(String column) {
-    return (!column.endsWith(FAMILY_INDICATOR) && column.indexOf(FAMILY_INDICATOR) == -1)?
+    return (!column.endsWith(FAMILY_INDICATOR) && column
-      column + FAMILY_INDICATOR: column;
+        .indexOf(FAMILY_INDICATOR) == -1) ? column + FAMILY_INDICATOR : column;
   }
 
   /**
@@ -79,18 +83,18 @@ public abstract class BasicCommand implements Command, CommandFactory {
   public Writer getOut() {
     return this.out;
   }
-  
+
   public void print(final String msg) throws IOException {
     this.out.write(msg);
   }
-  
+
   public void println(final String msg) throws IOException {
     print(msg);
     print(LINE_SEPARATOR);
     this.out.flush();
   }
-  
+
   public CommandType getCommandType() {
     return CommandType.SELECT;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/ClearCommand.java

@@ -25,14 +25,15 @@ import java.io.Writer;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 
 /**
- * Clears the console screen. 
+ * Clears the console screen.
  */
 public class ClearCommand extends BasicCommand {
   public ClearCommand(Writer o) {
     super(o);
   }
 
-  public ReturnMsg execute(@SuppressWarnings("unused") HBaseConfiguration conf) {
+  public ReturnMsg execute(@SuppressWarnings("unused")
+  HBaseConfiguration conf) {
     clear();
     return null;
   }
@@ -57,9 +58,9 @@ public class ClearCommand extends BasicCommand {
       }
     }
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.SHELL;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/Command.java

@@ -24,10 +24,14 @@ import org.apache.hadoop.hbase.HBaseConfiguration;
 public interface Command {
   /** family indicator */
   public static final String FAMILY_INDICATOR = ":";
-  
-  public enum CommandType {DDL, UPDATE, SELECT, INSERT, DELETE, SHELL}
 
-  /** Execute a command
+  public enum CommandType {
+    DDL, UPDATE, SELECT, INSERT, DELETE, SHELL
+  }
+
+  /**
+   * Execute a command
+   * 
    * @param conf Configuration
    * @return Result of command execution
    */
@@ -35,7 +39,7 @@ public interface Command {
 
   /**
    * @return Type of this command whether DDL, SELECT, INSERT, UPDATE, DELETE,
-   * or SHELL.
+   *         or SHELL.
    */
   public CommandType getCommandType();
-}
+}

src/java/org/apache/hadoop/hbase/shell/CreateCommand.java

@@ -37,20 +37,19 @@ import org.apache.hadoop.io.Text;
  */
 public class CreateCommand extends SchemaModificationCommand {
   private Text tableName;
-  private Map<String, Map<String, Object>> columnSpecMap =
+  private Map<String, Map<String, Object>> columnSpecMap = new HashMap<String, Map<String, Object>>();
-    new HashMap<String, Map<String, Object>>();
+
-  
   public CreateCommand(Writer o) {
     super(o);
   }
-  
+
   public ReturnMsg execute(HBaseConfiguration conf) {
     try {
       HConnection conn = HConnectionManager.getConnection(conf);
       if (conn.tableExists(this.tableName)) {
-        return new ReturnMsg(0, "'" + this.tableName + "' Table already exist");
+        return new ReturnMsg(0, "'" + this.tableName + "' table already exist.");
       }
-      
+
       HBaseAdmin admin = new HBaseAdmin(conf);
       HTableDescriptor tableDesc = new HTableDescriptor(tableName.toString());
       HColumnDescriptor columnDesc = null;
@@ -59,19 +58,19 @@ public class CreateCommand extends SchemaModificationCommand {
         columnDesc = getColumnDescriptor(column, columnSpecMap.get(column));
         tableDesc.addFamily(columnDesc);
       }
-      
+
       println("Creating table... Please wait.");
-      
+
       admin.createTable(tableDesc);
       return new ReturnMsg(0, "Table created successfully.");
-    }
+    } catch (Exception e) {
-    catch (Exception e) {
       return new ReturnMsg(0, extractErrMsg(e));
     }
   }
 
   /**
    * Sets the table to be created.
+   * 
    * @param tableName Table to be created
    */
   public void setTable(String tableName) {
@@ -79,13 +78,14 @@ public class CreateCommand extends SchemaModificationCommand {
   }
 
   /**
-   * Adds a column specification.  
+   * Adds a column specification.
+   * 
    * @param columnSpec Column specification
    */
   public void addColumnSpec(String column, Map<String, Object> columnSpec) {
     columnSpecMap.put(column, columnSpec);
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.DDL;

src/java/org/apache/hadoop/hbase/shell/DeleteCommand.java

@@ -50,9 +50,9 @@ public class DeleteCommand extends BasicCommand {
     try {
       HConnection conn = HConnectionManager.getConnection(conf);
       if (!conn.tableExists(new Text(this.tableName))) {
-        return new ReturnMsg(0, "'" + this.tableName + "' Table not found");
+        return new ReturnMsg(0, "'" + this.tableName + "'" + TABLE_NOT_FOUND);
       }
-      
+
       HBaseAdmin admin = new HBaseAdmin(conf);
       HTable hTable = new HTable(conf, new Text(tableName));
       long lockID = hTable.startUpdate(new Text(rowKey));
@@ -77,6 +77,7 @@ public class DeleteCommand extends BasicCommand {
 
   /**
    * Sets the column list.
+   * 
    * @param columnList
    */
   public void setColumnList(List<String> columnList) {
@@ -92,7 +93,8 @@ public class DeleteCommand extends BasicCommand {
     Text[] columns = null;
     try {
       if (this.columnList.contains("*")) {
-        columns = hTable.getRow(new Text(this.rowKey)).keySet().toArray(new Text[] {});
+        columns = hTable.getRow(new Text(this.rowKey)).keySet().toArray(
+            new Text[] {});
       } else {
         List<Text> tmpList = new ArrayList<Text>();
         for (int i = 0; i < this.columnList.size(); i++) {
@@ -111,9 +113,9 @@ public class DeleteCommand extends BasicCommand {
     }
     return columns;
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.DELETE;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/DescCommand.java

@@ -33,42 +33,41 @@ import org.apache.hadoop.io.Text;
  * Prints information about tables.
  */
 public class DescCommand extends BasicCommand {
-  private static final String [] HEADER =
+  private static final String[] HEADER = new String[] { "Column Family Descriptor" };
-    new String [] {"Column Family Descriptor"};
   private Text tableName;
   private final TableFormatter formatter;
-  
+
   // Not instantiable
   @SuppressWarnings("unused")
   private DescCommand() {
     this(null, null);
   }
-  
+
   public DescCommand(final Writer o, final TableFormatter f) {
     super(o);
     this.formatter = f;
   }
-  
+
   public ReturnMsg execute(final HBaseConfiguration conf) {
-    if (this.tableName == null) 
+    if (this.tableName == null)
-      return new ReturnMsg(0, "Syntax error : Please check 'Describe' syntax");
+      return new ReturnMsg(0, "Syntax error : Please check 'Describe' syntax.");
     try {
       HConnection conn = HConnectionManager.getConnection(conf);
       if (!conn.tableExists(this.tableName)) {
-        return new ReturnMsg(0, "Table not found");
+        return new ReturnMsg(0, "Table not found.");
       }
-      HTableDescriptor [] tables = conn.listTables();
+      HTableDescriptor[] tables = conn.listTables();
-      HColumnDescriptor [] columns = null;
+      HColumnDescriptor[] columns = null;
       for (int i = 0; i < tables.length; i++) {
         if (tables[i].getName().equals(this.tableName)) {
-          columns = tables[i].getFamilies().values().
+          columns = tables[i].getFamilies().values().toArray(
-            toArray(new HColumnDescriptor [] {});
+              new HColumnDescriptor[] {});
           break;
         }
       }
       formatter.header(HEADER);
       // Do a toString on the HColumnDescriptors
-      String [] columnStrs = new String[columns.length];
+      String[] columnStrs = new String[columns.length];
       for (int i = 0; i < columns.length; i++) {
         String tmp = columns[i].toString();
         // Strip the curly-brackets if present.
@@ -76,10 +75,10 @@ public class DescCommand extends BasicCommand {
           tmp = tmp.substring(1, tmp.length() - 1);
         }
         columnStrs[i] = tmp;
-        formatter.row(new String [] {columnStrs[i]});
+        formatter.row(new String[] { columnStrs[i] });
       }
       formatter.footer();
-      return new ReturnMsg(1, columns.length + " columnfamily(s) in set");
+      return new ReturnMsg(1, columns.length + " columnfamily(s) in set.");
     } catch (IOException e) {
       return new ReturnMsg(0, "error msg : " + e.toString());
     }
@@ -88,4 +87,4 @@ public class DescCommand extends BasicCommand {
   public void setArgument(String table) {
     this.tableName = new Text(table);
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/DisableCommand.java

@@ -24,6 +24,8 @@ import java.io.Writer;
 
 import org.apache.hadoop.hbase.HBaseAdmin;
 import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HConnection;
+import org.apache.hadoop.hbase.HConnectionManager;
 import org.apache.hadoop.io.Text;
 
 /**
@@ -31,18 +33,23 @@ import org.apache.hadoop.io.Text;
  */
 public class DisableCommand extends BasicCommand {
   private String tableName;
-  
+
   public DisableCommand(Writer o) {
     super(o);
   }
- 
+
   public ReturnMsg execute(HBaseConfiguration conf) {
     assert tableName != null;
-    
+
     try {
+      HConnection conn = HConnectionManager.getConnection(conf);
+      if (!conn.tableExists(new Text(this.tableName))) {
+        return new ReturnMsg(0, "'" + this.tableName + "'" + TABLE_NOT_FOUND);
+      }
+
       HBaseAdmin admin = new HBaseAdmin(conf);
       admin.disableTable(new Text(tableName));
-      
+
       return new ReturnMsg(1, "Table disabled successfully.");
     } catch (IOException e) {
       String[] msg = e.getMessage().split("[\n]");
@@ -53,9 +60,9 @@ public class DisableCommand extends BasicCommand {
   public void setTable(String table) {
     this.tableName = table;
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.DDL;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/DropCommand.java

@@ -25,6 +25,8 @@ import java.util.List;
 
 import org.apache.hadoop.hbase.HBaseAdmin;
 import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HConnection;
+import org.apache.hadoop.hbase.HConnectionManager;
 import org.apache.hadoop.io.Text;
 
 /**
@@ -32,25 +34,36 @@ import org.apache.hadoop.io.Text;
  */
 public class DropCommand extends BasicCommand {
   private List<String> tableList;
-  
+
   public DropCommand(Writer o) {
     super(o);
   }
 
   public ReturnMsg execute(HBaseConfiguration conf) {
     if (tableList == null) {
-      throw new IllegalArgumentException("List of tables is null");
+      throw new IllegalArgumentException("List of tables is null.");
     }
- 
+
     try {
       HBaseAdmin admin = new HBaseAdmin(conf);
-      
+      HConnection conn = HConnectionManager.getConnection(conf);
+
+      int count = 0;
       for (String table : tableList) {
-        println("Dropping " + table + "... Please wait.");
+        if (!conn.tableExists(new Text(table))) {
-        admin.deleteTable(new Text(table));
+          println("'" + table + "' table not found.");
+        } else {
+          println("Dropping " + table + "... Please wait.");
+          admin.deleteTable(new Text(table));
+          count++;
+        }
+      }
+
+      if (count > 0) {
+        return new ReturnMsg(1, count + " table(s) dropped successfully.");
+      } else {
+        return new ReturnMsg(0, count + " table(s) dropped.");
       }
-      
-      return new ReturnMsg(1, "Table(s) dropped successfully.");
     } catch (IOException e) {
       return new ReturnMsg(0, extractErrMsg(e));
     }
@@ -59,9 +72,9 @@ public class DropCommand extends BasicCommand {
   public void setTableList(List<String> tableList) {
     this.tableList = tableList;
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.DDL;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/EnableCommand.java

@@ -33,19 +33,19 @@ import org.apache.hadoop.io.Text;
  */
 public class EnableCommand extends BasicCommand {
   private String tableName;
-  
+
   public EnableCommand(Writer o) {
     super(o);
   }
- 
+
   public ReturnMsg execute(HBaseConfiguration conf) {
     assert tableName != null;
     try {
       HConnection conn = HConnectionManager.getConnection(conf);
       if (!conn.tableExists(new Text(this.tableName))) {
-        return new ReturnMsg(0, "'" + this.tableName + "' Table not found");
+        return new ReturnMsg(0, "'" + this.tableName + "'" + TABLE_NOT_FOUND);
       }
-      
+
       HBaseAdmin admin = new HBaseAdmin(conf);
       admin.enableTable(new Text(tableName));
       return new ReturnMsg(1, "Table enabled successfully.");
@@ -58,9 +58,9 @@ public class EnableCommand extends BasicCommand {
   public void setTable(String table) {
     this.tableName = table;
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.DDL;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/ExitCommand.java

@@ -28,13 +28,14 @@ public class ExitCommand extends BasicCommand {
     super(o);
   }
 
-  public ReturnMsg execute(@SuppressWarnings("unused") HBaseConfiguration conf) {
+  public ReturnMsg execute(@SuppressWarnings("unused")
-    // TOD: Is this the best way to exit?  Would be a problem if shell is run
+  HBaseConfiguration conf) {
+    // TOD: Is this the best way to exit? Would be a problem if shell is run
     // inside another program -- St.Ack 09/11/2007
-    System.exit(1);
+    System.exit(9999);
     return null;
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.SHELL;

src/java/org/apache/hadoop/hbase/shell/FsCommand.java

@@ -31,13 +31,14 @@ import org.apache.hadoop.util.ToolRunner;
  */
 public class FsCommand extends BasicCommand {
   private List<String> query;
-  
+
   public FsCommand(Writer o) {
     super(o);
   }
 
-  public ReturnMsg execute(@SuppressWarnings("unused") HBaseConfiguration conf) {
+  public ReturnMsg execute(@SuppressWarnings("unused")
-    // This commmand will write the 
+  HBaseConfiguration conf) {
+    // This commmand will write the
     FsShell shell = new FsShell();
     try {
       ToolRunner.run(shell, getQuery());
@@ -55,7 +56,7 @@ public class FsCommand extends BasicCommand {
   private String[] getQuery() {
     return query.toArray(new String[] {});
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.SHELL;

src/java/org/apache/hadoop/hbase/shell/HelpCommand.java

@@ -30,8 +30,8 @@ import org.apache.hadoop.hbase.HBaseConfiguration;
 
 public class HelpCommand extends BasicCommand {
   private String argument;
-  private static final String[] HEADER = new String[] { "Command",
+  private static final String[] HEADER = new String[] { "Command", "Description",
-      "Description", "Example" };
+      "Example" };
 
   /** application name */
   public static final String APP_NAME = "Hbase Shell";
@@ -74,10 +74,10 @@ public class HelpCommand extends BasicCommand {
 
     load.put("FS", new String[] {
         "Hadoop FsShell; entering a lone 'FS;' " + "will emit usage",
-        "FS -copyFromLocal /home/user/backup.dat fs/user/backup;" });
+        "FS [-option] arguments..;" });
 
     load.put("JAR", new String[] { "Hadoop RunJar util",
-        "JAR ./build/hadoop-examples.jar pi 10 10;" });
+        "JAR jarFile [mainClass] arguments...;" });
     load.put("CLEAR", new String[] { "Clear the screen", "CLEAR;" });
 
     load.put("DESCRIBE", new String[] { "Print table information",
@@ -125,11 +125,12 @@ public class HelpCommand extends BasicCommand {
     // model of
     // data.
 
-    load.put("TABLE",
+    load
-        new String[] { "Load a table", "A = table('table_name');" });
+        .put("TABLE", new String[] { "Load a table", "A = table('table_name');" });
     load.put("SUBSTITUTE", new String[] { "Substitute expression to [A~Z]",
         "D = A.projection('cf_name1'[, 'cf_name2']);" });
-    load.put("SAVE", new String[] { "Save results into specified table (It runs a mapreduce job)",
+    load.put("SAVE", new String[] {
+        "Save results into specified table (It runs a mapreduce job)",
         "SAVE A INTO table('table_name');" });
 
     // Relational Operations
@@ -146,14 +147,11 @@ public class HelpCommand extends BasicCommand {
                     + " B = A.Selection(cf_name1 > 100 [AND cf_name2 = 'string_value']);" });
 
     // Aggregation Functions
-    //TODO : and apply aggregate function independently to each group of rows 
+    // TODO : and apply aggregate function independently to each group of rows
-    load
+    load.put("GROUP", new String[] {
-        .put(
+        "Group rows by value of an attribute",
-            "GROUP",
+        "A = Table('table_name');"
-            new String[] {
+            + " B = Group A by ('cf_name1'[, 'cf_name2']);" });
-                "Group rows by value of an attribute",
-                "A = Table('table_name');"
-                    + " B = Group A by ('cf_name1'[, 'cf_name2']);" });
 
     return load;
   }

src/java/org/apache/hadoop/hbase/shell/InsertCommand.java

@@ -48,12 +48,12 @@ public class InsertCommand extends BasicCommand {
 
     HConnection conn = HConnectionManager.getConnection(conf);
     if (!conn.tableExists(this.tableName)) {
-      return new ReturnMsg(0, "'" + this.tableName + "' Table not found");
+      return new ReturnMsg(0, "'" + this.tableName + "'" + TABLE_NOT_FOUND);
     }
-    
+
     if (this.columnfamilies.size() != this.values.size())
       return new ReturnMsg(0,
-          "Mismatch between values list and columnfamilies list");
+          "Mismatch between values list and columnfamilies list.");
 
     try {
       HTable table = new HTable(conf, this.tableName);
@@ -61,7 +61,7 @@ public class InsertCommand extends BasicCommand {
 
       for (int i = 0; i < this.values.size(); i++) {
         Text column = null;
-        if(getColumn(i).toString().contains(":"))
+        if (getColumn(i).toString().contains(":"))
           column = getColumn(i);
         else
           column = new Text(getColumn(i) + ":");
@@ -103,7 +103,7 @@ public class InsertCommand extends BasicCommand {
   public byte[] getValue(int i) {
     return this.values.get(i).getBytes();
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.INSERT;

src/java/org/apache/hadoop/hbase/shell/JarCommand.java

@@ -43,14 +43,15 @@ import org.apache.hadoop.util.RunJar;
  */
 public class JarCommand extends BasicCommand {
   private List<String> query;
-  
+
   public JarCommand(Writer o) {
     super(o);
   }
 
   @SuppressWarnings("deprecation")
-  public ReturnMsg execute(@SuppressWarnings("unused") HBaseConfiguration conf) {
+  public ReturnMsg execute(@SuppressWarnings("unused")
-    
+  HBaseConfiguration conf) {
+
     try {
       String[] args = getQuery();
       String usage = "JAR jarFile [mainClass] args...;\n";
@@ -67,9 +68,9 @@ public class JarCommand extends BasicCommand {
       JarFile jarFile;
       try {
         jarFile = new JarFile(fileName);
-      } catch(IOException io) {
+      } catch (IOException io) {
         throw new IOException("Error opening job jar: " + fileName + "\n")
-          .initCause(io);
+            .initCause(io);
       }
 
       Manifest manifest = jarFile.getManifest();
@@ -88,7 +89,7 @@ public class JarCommand extends BasicCommand {
 
       File tmpDir = new File(new Configuration().get("hadoop.tmp.dir"));
       tmpDir.mkdirs();
-      if (!tmpDir.isDirectory()) { 
+      if (!tmpDir.isDirectory()) {
         return new ReturnMsg(0, "Mkdirs failed to create " + tmpDir + "\n");
       }
       final File workDir = File.createTempFile("hadoop-unjar", "", tmpDir);
@@ -99,19 +100,19 @@ public class JarCommand extends BasicCommand {
       }
 
       Runtime.getRuntime().addShutdownHook(new Thread() {
-          public void run() {
+        public void run() {
-            try {
+          try {
-              FileUtil.fullyDelete(workDir);
+            FileUtil.fullyDelete(workDir);
-            } catch (IOException e) {
+          } catch (IOException e) {
-              e.printStackTrace();
+            e.printStackTrace();
-            }
           }
-        });
+        }
+      });
 
       RunJar.unJar(file, workDir);
-      
+
       ArrayList<URL> classPath = new ArrayList<URL>();
-      classPath.add(new File(workDir+"/").toURL());
+      classPath.add(new File(workDir + "/").toURL());
       classPath.add(file.toURL());
       classPath.add(new File(workDir, "classes/").toURL());
       File[] libs = new File(workDir, "lib").listFiles();
@@ -120,29 +121,26 @@ public class JarCommand extends BasicCommand {
           classPath.add(libs[i].toURL());
         }
       }
-      ClassLoader loader =
+      ClassLoader loader = new URLClassLoader(classPath.toArray(new URL[0]));
-        new URLClassLoader(classPath.toArray(new URL[0]));
 
       Thread.currentThread().setContextClassLoader(loader);
       Class<?> mainClass = Class.forName(mainClassName, true, loader);
-      Method main = mainClass.getMethod("main", new Class[] {
+      Method main = mainClass.getMethod("main", new Class[] { Array.newInstance(
-        Array.newInstance(String.class, 0).getClass()
+          String.class, 0).getClass() });
-      });
+      String[] newArgs = Arrays.asList(args).subList(firstArg, args.length)
-      String[] newArgs = Arrays.asList(args)
+          .toArray(new String[0]);
-        .subList(firstArg, args.length).toArray(new String[0]);
       try {
         main.invoke(null, new Object[] { newArgs });
       } catch (InvocationTargetException e) {
         throw e.getTargetException();
       }
-
     } catch (Throwable e) {
       e.printStackTrace();
     }
-    
+
     return null;
   }
-  
+
   public void setQuery(List<String> query) {
     this.query = query;
   }
@@ -150,7 +148,7 @@ public class JarCommand extends BasicCommand {
   private String[] getQuery() {
     return query.toArray(new String[] {});
   }
-  
+
   @Override
   public CommandType getCommandType() {
     return CommandType.SHELL;

src/java/org/apache/hadoop/hbase/shell/ReturnMsg.java

@@ -46,7 +46,7 @@ public class ReturnMsg {
   public int getType() {
     return this.type;
   }
-  
+
   @Override
   public String toString() {
     return this.msg;

src/java/org/apache/hadoop/hbase/shell/SchemaModificationCommand.java

@@ -42,7 +42,7 @@ public abstract class SchemaModificationCommand extends BasicCommand {
   private int vectorSize;
   private int numHash;
   private int numEntries;
-  
+
   public SchemaModificationCommand(Writer o) {
     super(o);
   }
@@ -77,8 +77,8 @@ public abstract class SchemaModificationCommand extends BasicCommand {
       } else if (spec.equals("IN_MEMORY")) {
         inMemory = (Boolean) columnSpec.get(spec);
       } else if (spec.equals("BLOOMFILTER")) {
-        bloomFilterType = BloomFilterType.valueOf(((String) columnSpec
+        bloomFilterType = BloomFilterType.valueOf(((String) columnSpec.get(spec))
-            .get(spec)).toUpperCase());
+            .toUpperCase());
       } else if (spec.equals("VECTOR_SIZE")) {
         vectorSize = (Integer) columnSpec.get(spec);
       } else if (spec.equals("NUM_HASH")) {
@@ -95,8 +95,8 @@ public abstract class SchemaModificationCommand extends BasicCommand {
       if (specs.contains("NUM_ENTRIES")) {
         bloomFilterDesc = new BloomFilterDescriptor(bloomFilterType, numEntries);
       } else {
-        bloomFilterDesc = new BloomFilterDescriptor(bloomFilterType,
+        bloomFilterDesc = new BloomFilterDescriptor(bloomFilterType, vectorSize,
-            vectorSize, numHash);
+            numHash);
       }
     }
 
@@ -107,4 +107,4 @@ public abstract class SchemaModificationCommand extends BasicCommand {
 
     return columnDesc;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/SelectCommand.java

@@ -55,38 +55,36 @@ public class SelectCommand extends BasicCommand {
   // Count of versions to return.
   private int version;
   private boolean whereClause = false;
-  private static final String [] HEADER_ROW_CELL =
+  private static final String[] HEADER_ROW_CELL = new String[] { "Row", "Cell" };
-    new String [] {"Row", "Cell"};
+  private static final String[] HEADER_COLUMN_CELL = new String[] { "Column",
-  private static final String [] HEADER_COLUMN_CELL =
+      "Cell" };
-    new String [] {"Column", "Cell"};
+  private static final String[] HEADER = new String[] { "Row", "Column", "Cell" };
-  private static final String [] HEADER =
-    new String [] {"Row", "Column", "Cell"};
   private static final String STAR = "*";
-  
+
   private final TableFormatter formatter;
-  
+
   // Not instantiable
   @SuppressWarnings("unused")
   private SelectCommand() {
     this(null, null);
   }
-  
+
   public SelectCommand(final Writer o, final TableFormatter f) {
     super(o);
     this.formatter = f;
   }
 
   public ReturnMsg execute(final HBaseConfiguration conf) {
-    if (this.tableName.equals("") || this.rowKey == null ||
+    if (this.tableName.equals("") || this.rowKey == null
-        this.columns.size() == 0) {
+        || this.columns.size() == 0) {
       return new ReturnMsg(0, "Syntax error : Please check 'Select' syntax.");
-    } 
+    }
     try {
       HConnection conn = HConnectionManager.getConnection(conf);
       if (!conn.tableExists(this.tableName)) {
-        return new ReturnMsg(0, "'" + this.tableName + "' Table not found");
+        return new ReturnMsg(0, "'" + this.tableName + "'" + TABLE_NOT_FOUND);
       }
-      
+
       HTable table = new HTable(conf, this.tableName);
       HBaseAdmin admin = new HBaseAdmin(conf);
       int count = 0;
@@ -95,7 +93,7 @@ public class SelectCommand extends BasicCommand {
       } else {
         count = scanPrint(table, admin);
       }
-      return new ReturnMsg(1, Integer.toString(count) + " row(s) in set");
+      return new ReturnMsg(1, Integer.toString(count) + " row(s) in set.");
     } catch (IOException e) {
       String[] msg = e.getMessage().split("[,]");
       return new ReturnMsg(0, msg[0]);
@@ -110,27 +108,26 @@ public class SelectCommand extends BasicCommand {
         byte[][] result = null;
         ParsedColumns parsedColumns = getColumns(admin, false);
         boolean multiple = parsedColumns.isMultiple() || this.version > 1;
-        formatter.header(multiple? HEADER_COLUMN_CELL: null);
+        formatter.header(multiple ? HEADER_COLUMN_CELL : null);
-        for (Text column: parsedColumns.getColumns()) {
+        for (Text column : parsedColumns.getColumns()) {
           if (this.timestamp != 0) {
-            result = table.get(this.rowKey, column, this.timestamp,
+            result = table.get(this.rowKey, column, this.timestamp, this.version);
-              this.version);
           } else {
             result = table.get(this.rowKey, column, this.version);
           }
           for (int ii = 0; result != null && ii < result.length; ii++) {
             if (multiple) {
-              formatter.row(new String [] {column.toString(),
+              formatter.row(new String[] { column.toString(),
-                toString(column, result[ii])});
+                  toString(column, result[ii]) });
             } else {
-              formatter.row(new String [] {toString(column, result[ii])});
+              formatter.row(new String[] { toString(column, result[ii]) });
             }
             count++;
           }
         }
       } else {
-        formatter.header(isMultiple()? HEADER_COLUMN_CELL: null);
+        formatter.header(isMultiple() ? HEADER_COLUMN_CELL : null);
-        for (Map.Entry<Text, byte[]> e: table.getRow(this.rowKey).entrySet()) {
+        for (Map.Entry<Text, byte[]> e : table.getRow(this.rowKey).entrySet()) {
           Text key = e.getKey();
           String keyStr = key.toString();
           if (!this.columns.contains(STAR) && !this.columns.contains(keyStr)) {
@@ -138,9 +135,9 @@ public class SelectCommand extends BasicCommand {
           }
           String cellData = toString(key, e.getValue());
           if (isMultiple()) {
-            formatter.row(new String [] {key.toString(), cellData});
+            formatter.row(new String[] { key.toString(), cellData });
           } else {
-            formatter.row(new String [] {cellData});
+            formatter.row(new String[] { cellData });
           }
           count++;
         }
@@ -151,13 +148,13 @@ public class SelectCommand extends BasicCommand {
     }
     return count;
   }
-  
+
-  private String toString(final Text columnName, final byte [] cell)
+  private String toString(final Text columnName, final byte[] cell)
-  throws IOException {
+      throws IOException {
     String result = null;
-    if (columnName.equals(HConstants.COL_REGIONINFO) ||
+    if (columnName.equals(HConstants.COL_REGIONINFO)
-        columnName.equals(HConstants.COL_SPLITA) ||
+        || columnName.equals(HConstants.COL_SPLITA)
-        columnName.equals(HConstants.COL_SPLITA)) {
+        || columnName.equals(HConstants.COL_SPLITA)) {
       result = Writables.getHRegionInfoOrNull(cell).toString();
     } else if (columnName.equals(HConstants.COL_STARTCODE)) {
       result = Long.toString(Writables.bytesToLong(cell));
@@ -166,40 +163,39 @@ public class SelectCommand extends BasicCommand {
     }
     return result;
   }
-  
+
   /**
-   * Data structure with columns to use scanning and whether or not the
+   * Data structure with columns to use scanning and whether or not the scan
-   * scan could return more than one column.
+   * could return more than one column.
    */
   class ParsedColumns {
     private final List<Text> cols;
     private final boolean isMultiple;
-    
+
     ParsedColumns(final List<Text> columns) {
       this(columns, true);
     }
-    
+
     ParsedColumns(final List<Text> columns, final boolean isMultiple) {
       this.cols = columns;
       this.isMultiple = isMultiple;
     }
-    
+
     public List<Text> getColumns() {
       return this.cols;
     }
-    
+
     public boolean isMultiple() {
       return this.isMultiple;
     }
   }
-  
+
-  private int scanPrint(HTable table,
+  private int scanPrint(HTable table, HBaseAdmin admin) {
-      HBaseAdmin admin) {
     int count = 0;
     HScannerInterface scan = null;
     try {
       ParsedColumns parsedColumns = getColumns(admin, true);
-      Text [] cols = parsedColumns.getColumns().toArray(new Text [] {});
+      Text[] cols = parsedColumns.getColumns().toArray(new Text[] {});
       if (this.timestamp == 0) {
         scan = table.obtainScanner(cols, this.rowKey);
       } else {
@@ -208,17 +204,17 @@ public class SelectCommand extends BasicCommand {
       HStoreKey key = new HStoreKey();
       TreeMap<Text, byte[]> results = new TreeMap<Text, byte[]>();
       // If only one column in query, then don't print out the column.
-      formatter.header((parsedColumns.isMultiple())? HEADER: HEADER_ROW_CELL);
+      formatter.header((parsedColumns.isMultiple()) ? HEADER : HEADER_ROW_CELL);
       while (scan.next(key, results) && checkLimit(count)) {
         Text r = key.getRow();
         for (Text columnKey : results.keySet()) {
           String cellData = toString(columnKey, results.get(columnKey));
           if (parsedColumns.isMultiple()) {
-            formatter.row(new String [] {r.toString(), columnKey.toString(),
+            formatter.row(new String[] { r.toString(), columnKey.toString(),
-              cellData});
+                cellData });
           } else {
             // Don't print out the column since only one specified in query.
-            formatter.row(new String [] {r.toString(), cellData});
+            formatter.row(new String[] { r.toString(), cellData });
           }
           count++;
           if (this.limit > 0 && count >= this.limit) {
@@ -238,24 +234,24 @@ public class SelectCommand extends BasicCommand {
 
   /**
    * Make sense of the supplied list of columns.
+   * 
    * @param admin Admin to use.
    * @return Interpretation of supplied list of columns.
    */
-  public ParsedColumns getColumns(final HBaseAdmin admin,
+  public ParsedColumns getColumns(final HBaseAdmin admin, final boolean scanning) {
-      final boolean scanning) {
     ParsedColumns result = null;
     try {
       if (this.columns.contains("*")) {
         if (this.tableName.equals(HConstants.ROOT_TABLE_NAME)
             || this.tableName.equals(HConstants.META_TABLE_NAME)) {
-          result =
+          result = new ParsedColumns(Arrays
-            new ParsedColumns(Arrays.asList(HConstants.COLUMN_FAMILY_ARRAY));
+              .asList(HConstants.COLUMN_FAMILY_ARRAY));
         } else {
           HTableDescriptor[] tables = admin.listTables();
           for (int i = 0; i < tables.length; i++) {
             if (tables[i].getName().equals(this.tableName)) {
-              result = new ParsedColumns(new ArrayList<Text>(tables[i].
+              result = new ParsedColumns(new ArrayList<Text>(tables[i].families()
-                families().keySet()));
+                  .keySet()));
               break;
             }
           }
@@ -264,15 +260,16 @@ public class SelectCommand extends BasicCommand {
         List<Text> tmpList = new ArrayList<Text>();
         for (int i = 0; i < this.columns.size(); i++) {
           Text column = null;
-          // Add '$' to column name if we are scanning.  Scanners support
+          // Add '$' to column name if we are scanning. Scanners support
-          // regex column names.  Adding '$', the column becomes a
+          // regex column names. Adding '$', the column becomes a
           // regex that does an explicit match on the supplied column name.
           // Otherwise, if the specified column is a column family, then
           // default behavior is to fetch all columns that have a matching
           // column family.
-          column = (this.columns.get(i).contains(":"))?
+          column = (this.columns.get(i).contains(":")) ? new Text(this.columns
-            new Text(this.columns.get(i) + (scanning? "$": "")):
+              .get(i)
-            new Text(this.columns.get(i) + ":" + (scanning? "$": ""));
+              + (scanning ? "$" : "")) : new Text(this.columns.get(i) + ":"
+              + (scanning ? "$" : ""));
           tmpList.add(column);
         }
         result = new ParsedColumns(tmpList, tmpList.size() > 1);
@@ -282,7 +279,7 @@ public class SelectCommand extends BasicCommand {
     }
     return result;
   }
-  
+
   /*
    * @return True if query contains multiple columns.
    */
@@ -291,7 +288,7 @@ public class SelectCommand extends BasicCommand {
   }
 
   private boolean checkLimit(int count) {
-    return (this.limit == 0)? true: (this.limit > count) ? true : false;
+    return (this.limit == 0) ? true : (this.limit > count) ? true : false;
   }
 
   public void setTable(String table) {
@@ -316,8 +313,8 @@ public class SelectCommand extends BasicCommand {
   }
 
   public void setRowKey(String rowKey) {
-    if(rowKey == null) 
+    if (rowKey == null)
-      this.rowKey = null; 
+      this.rowKey = null;
     else
       this.rowKey = new Text(rowKey);
   }
@@ -328,18 +325,17 @@ public class SelectCommand extends BasicCommand {
   public void setVersion(int version) {
     this.version = version;
   }
-  
+
   public static void main(String[] args) throws Exception {
     Writer out = new OutputStreamWriter(System.out, "UTF-8");
     HBaseConfiguration c = new HBaseConfiguration();
     // For debugging
-    TableFormatterFactory tff =
+    TableFormatterFactory tff = new TableFormatterFactory(out, c);
-      new TableFormatterFactory(out, c);
+    Parser parser = new Parser("select * from 'x' where row='x';", out, tff.get());
-    Parser parser = new Parser("select * from 'x' where row='x';", out,  tff.get());
     Command cmd = parser.terminatedCommand();
-    
+
     ReturnMsg rm = cmd.execute(c);
-    out.write(rm == null? "": rm.toString());
+    out.write(rm == null ? "" : rm.toString());
     out.flush();
   }
 }

src/java/org/apache/hadoop/hbase/shell/ShowCommand.java

@@ -45,8 +45,7 @@ public class ShowCommand extends BasicCommand {
     this(o, f, null);
   }
 
-  public ShowCommand(final Writer o, final TableFormatter f,
+  public ShowCommand(final Writer o, final TableFormatter f, final String argument) {
-      final String argument) {
     super(o);
     this.formatter = f;
     this.command = argument;
@@ -54,7 +53,7 @@ public class ShowCommand extends BasicCommand {
 
   public ReturnMsg execute(final HBaseConfiguration conf) {
     if (this.command == null) {
-      return new ReturnMsg(0, "Syntax error : Please check 'Show' syntax");
+      return new ReturnMsg(0, "Syntax error : Please check 'Show' syntax.");
     }
     try {
       HBaseAdmin admin = new HBaseAdmin(conf);
@@ -63,7 +62,7 @@ public class ShowCommand extends BasicCommand {
         HTableDescriptor[] tables = admin.listTables();
         tableLength = tables.length;
         if (tableLength == 0) {
-          return new ReturnMsg(0, "No tables found");
+          return new ReturnMsg(0, "No tables found.");
         }
         formatter.header(HEADER);
         for (int i = 0; i < tableLength; i++) {
@@ -71,7 +70,7 @@ public class ShowCommand extends BasicCommand {
           formatter.row(new String[] { tableName, tables[i].toString() });
         }
         formatter.footer();
-        return new ReturnMsg(1, tableLength + " table(s) in set");
+        return new ReturnMsg(1, tableLength + " table(s) in set.");
       } else {
         Map<String, VariableRef> refer = VariablesPool.get(command);
         if (refer == null) {

src/java/org/apache/hadoop/hbase/shell/SubstituteCommand.java

@@ -67,7 +67,8 @@ public class SubstituteCommand extends BasicCommand {
   public void resetVariableRelation(String r1, String r2) {
     setChainKey(r1);
     String tableName = VariablesPool.get(r1).get(null).getArgument();
-    VariableRef formula = new VariableRef(Constants.JOIN_SECOND_RELATION, tableName);
+    VariableRef formula = new VariableRef(Constants.JOIN_SECOND_RELATION,
+        tableName);
     VariablesPool.put(r1, r2, formula);
   }
 

src/java/org/apache/hadoop/hbase/shell/TableFormatter.java

@@ -27,33 +27,37 @@ import org.apache.hadoop.hbase.shell.formatter.AsciiTableFormatter;
 /**
  * Interface implemented by table formatters outputting select results.
  * Implementations must have a constructor that takes a Writer.
+ * 
  * @see AsciiTableFormatter
  */
 public interface TableFormatter {
   /**
    * Output header.
+   * 
    * @param titles Titles to emit.
    * @throws IOException
    */
-  public void header(final String [] titles) throws IOException;
+  public void header(final String[] titles) throws IOException;
-  
+
   /**
    * Output footer.
+   * 
    * @throws IOException
    */
   public void footer() throws IOException;
-  
+
   /**
    * Output a row.
+   * 
    * @param cells
    * @throws IOException
    */
-  public void row(final String [] cells) throws IOException;
+  public void row(final String[] cells) throws IOException;
 
   /**
-   * @return Output stream being used (This is in interface to enforce fact
+   * @return Output stream being used (This is in interface to enforce fact that
-   * that formatters use Writers -- that they operate on character streams
+   *         formatters use Writers -- that they operate on character streams
-   * rather than on byte streams).
+   *         rather than on byte streams).
    */
   public Writer getOut();
-}
+}

src/java/org/apache/hadoop/hbase/shell/TableFormatterFactory.java

@@ -28,34 +28,34 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.shell.formatter.AsciiTableFormatter;
 
 /**
- * Table formatter.
+ * Table formatter. Specify formatter by setting "hbaseshell.formatter" property
- * Specify formatter by setting "hbaseshell.formatter" property in
+ * in <code>hbase-site.xml</code> or by setting system property
- * <code>hbase-site.xml</code> or by setting system property
+ * <code>hbaseshell.formatter</code>. System property setting prevails over
- * <code>hbaseshell.formatter</code>. System property setting prevails over all
+ * all other configurations. Outputs UTF-8 encoded Strings even if original data
- * other configurations.  Outputs UTF-8 encoded Strings even if
+ * is binary. On static initialization, changes System.out to be a UTF-8 output
- * original data is binary.  On static initialization, changes System.out to be
+ * stream. .
- * a UTF-8 output stream.
+ * <p>
- * .
+ * TODO: Mysql has --skip-column-names and --silent which inserts a tab as
- * <p>TODO: Mysql has --skip-column-names and --silent which inserts a tab as
+ * separator. Also has --html and --xml.
- * separator.  Also has --html and --xml.
+ * <p>
- * <p>To use the html formatter, currently set HBASE_OPTS as in:
+ * To use the html formatter, currently set HBASE_OPTS as in:
  * <code>$ HBASE_OPTS="-Dhbaseshell.formatter=org.apache.hadoop.hbase.shell.formatter.HtmlTableFormatter" ./bin/hbase shell</code>
  * </p>
  */
 public class TableFormatterFactory {
-  private static final Log LOG =
+  private static final Log LOG = LogFactory.getLog(TableFormatterFactory.class
-    LogFactory.getLog(TableFormatterFactory.class.getName());
+      .getName());
   private static final String FORMATTER_KEY = "hbaseshell.formatter";
   private final TableFormatter formatter;
-  
+
   /**
    * Not instantiable
    */
-  @SuppressWarnings({ "unchecked", "unused" })
+  @SuppressWarnings( { "unchecked", "unused" })
   private TableFormatterFactory() {
     this(null, null);
   }
-  
+
   @SuppressWarnings("unchecked")
   public TableFormatterFactory(final Writer out, final Configuration c) {
     String className = System.getProperty(FORMATTER_KEY);
@@ -64,10 +64,10 @@ public class TableFormatterFactory {
     }
     LOG.debug("Table formatter class: " + className);
     try {
-      Class<TableFormatter> clazz =
+      Class<TableFormatter> clazz = (Class<TableFormatter>) Class
-        (Class<TableFormatter>) Class.forName(className);
+          .forName(className);
       Constructor<?> constructor = clazz.getConstructor(Writer.class);
-      this.formatter =  (TableFormatter)constructor.newInstance(out);
+      this.formatter = (TableFormatter) constructor.newInstance(out);
     } catch (Exception e) {
       throw new RuntimeException("Failed instantiation of " + className, e);
     }
@@ -80,4 +80,4 @@ public class TableFormatterFactory {
   public TableFormatter get() {
     return this.formatter;
   }
-}
+}

src/java/org/apache/hadoop/hbase/shell/VariableRef.java

@@ -34,6 +34,7 @@ public class VariableRef {
 
   /**
    * Return argument of an operation
+   * 
    * @return argument
    */
   public String getArgument() {
@@ -42,6 +43,7 @@ public class VariableRef {
 
   /**
    * Return operation
+   * 
    * @return operation
    */
   public String getOperation() {