HBASE-16191 Add stop_regionserver and stop_master to shell

Amending-Author: Peter Somogyi <psomogyi@apache.org>

hbase-shell/src/main/ruby/.rubocop.yml

@@ -0,0 +1,5 @@
+Naming/HeredocDelimiterNaming:
+  Enabled: false
+
+Layout/IndentHeredoc:
+  Enabled: false

hbase-shell/src/main/ruby/hbase/admin.rb

@@ -1309,6 +1309,16 @@ module Hbase
                               TableName.valueOf(new_table_name),
                               preserve_splits)
     end
+
+    # Stop the active Master
+    def stop_master
+      @admin.stopMaster
+    end
+
+    # Stop the given RegionServer
+    def stop_regionserver(hostport)
+      @admin.stopRegionServer(hostport)
+    end
   end
   # rubocop:enable Metrics/ClassLength
 end

hbase-shell/src/main/ruby/shell.rb

@@ -357,6 +357,8 @@ Shell.load_command_group(
     list_deadservers
     clear_deadservers
     clear_block_cache
+    stop_master
+    stop_regionserver
   ],
   # TODO: remove older hlog_roll command
   aliases: {

hbase-shell/src/main/ruby/shell/commands/stop_master.rb

@@ -0,0 +1,38 @@
+#
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+module Shell
+  module Commands
+    # Stop active Master
+    class StopMaster < Command
+      def help
+        <<-EOF
+Stop active Master. For experts only.
+Examples:
+
+  hbase> stop_master
+EOF
+      end
+
+      def command
+        admin.stop_master
+      end
+    end
+  end
+end

hbase-shell/src/main/ruby/shell/commands/stop_regionserver.rb

@@ -0,0 +1,40 @@
+#
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+module Shell
+  module Commands
+    # Stop a RegionServer
+    class StopRegionserver < Command
+      def help
+        <<-EOF
+Stop a RegionServer. For experts only.
+Consider using graceful_stop.sh script instead!
+
+Examples:
+
+  hbase> stop_regionserver 'hostname:port'
+EOF
+      end
+
+      def command(hostport)
+        admin.stop_regionserver(hostport)
+      end
+    end
+  end
+end