/**
    *
    * 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.
   */
  package org.apache.hadoop.hbase.client;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.nio.file.FileSystems;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.StandardCopyOption;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category({MediumTests.class})
  public class TestUpdateConfiguration {
    private static final Log LOG = LogFactory.getLog(TestUpdateConfiguration.class);
    private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
  
    @BeforeClass
    public static void setup() throws Exception {
      TEST_UTIL.startMiniCluster(2, 1);
    }
  
    @Test
    public void testOnlineConfigChange() throws IOException {
      LOG.debug("Starting the test");
      Admin admin = TEST_UTIL.getHBaseAdmin();
      ServerName server = TEST_UTIL.getHBaseCluster().getRegionServer(0).getServerName();
      admin.updateConfiguration(server);
    }
  
    @Test
    public void testMasterOnlineConfigChange() throws IOException {
      LOG.debug("Starting the test");
      Path cnfPath = FileSystems.getDefault().getPath("target/test-classes/hbase-site.xml");
      Path cnf2Path = FileSystems.getDefault().getPath("target/test-classes/hbase-site2.xml");
      Path cnf3Path = FileSystems.getDefault().getPath("target/test-classes/hbase-site3.xml");
      // make a backup of hbase-site.xml
      Files.copy(cnfPath, cnf3Path, StandardCopyOption.REPLACE_EXISTING);
      // update hbase-site.xml by overwriting it
      Files.copy(cnf2Path, cnfPath, StandardCopyOption.REPLACE_EXISTING);
  
      Admin admin = TEST_UTIL.getHBaseAdmin();
      ServerName server = TEST_UTIL.getHBaseCluster().getMaster().getServerName();
      admin.updateConfiguration(server);
      Configuration conf = TEST_UTIL.getMiniHBaseCluster().getMaster().getConfiguration();
      int custom = conf.getInt("hbase.custom.config", 0);
      assertEquals(custom, 1000);
      // restore hbase-site.xml
      Files.copy(cnf3Path, cnfPath, StandardCopyOption.REPLACE_EXISTING);
    }
  
    @Test
    public void testAllOnlineConfigChange() throws IOException {
      LOG.debug("Starting the test");
      Admin admin = TEST_UTIL.getHBaseAdmin();
      admin.updateConfiguration();
    }
  
    @Test
    public void testAllCustomOnlineConfigChange() throws IOException {
      LOG.debug("Starting the test");
      Path cnfPath = FileSystems.getDefault().getPath("target/test-classes/hbase-site.xml");
      Path cnf2Path = FileSystems.getDefault().getPath("target/test-classes/hbase-site2.xml");
      Path cnf3Path = FileSystems.getDefault().getPath("target/test-classes/hbase-site3.xml");
      // make a backup of hbase-site.xml
      Files.copy(cnfPath, cnf3Path, StandardCopyOption.REPLACE_EXISTING);
      // update hbase-site.xml by overwriting it
      Files.copy(cnf2Path, cnfPath, StandardCopyOption.REPLACE_EXISTING);
  
      Admin admin = TEST_UTIL.getHBaseAdmin();
      admin.updateConfiguration();
  
      // Check the configuration of the Masters
     Configuration masterConfiguration = TEST_UTIL.getMiniHBaseCluster().getMaster(0).getConfiguration();
     int custom = masterConfiguration.getInt("hbase.custom.config", 0);
     assertEquals(custom, 1000);
     Configuration backupMasterConfiguration = TEST_UTIL.getMiniHBaseCluster().getMaster(1).getConfiguration();
     custom = backupMasterConfiguration.getInt("hbase.custom.config", 0);
     assertEquals(custom, 1000);
 
     // Check the configuration of the RegionServer
     Configuration regionServerConfiguration = TEST_UTIL.getMiniHBaseCluster().getRegionServer(0).getConfiguration();
     custom = regionServerConfiguration.getInt("hbase.custom.config", 0);
     assertEquals(custom, 1000);
 
     // restore hbase-site.xml
     Files.copy(cnf3Path, cnfPath, StandardCopyOption.REPLACE_EXISTING);
   }
 }