/*
 * 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.master;

import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

import org.apache.hadoop.hbase.HBaseTestingUtil;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.StartTestingClusterOption;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.RegionLocator;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Tag(LargeTests.TAG)
public class TestMetaAssignmentWithStopMaster {

  private static final Logger LOG = LoggerFactory.getLogger(TestMetaAssignmentWithStopMaster.class);

  private static final HBaseTestingUtil UTIL = new HBaseTestingUtil();

  private static final long WAIT_TIMEOUT = 120000;

  @BeforeAll
  public static void setUpBeforeClass() throws Exception {
    StartTestingClusterOption option =
      StartTestingClusterOption.builder().numMasters(2).numRegionServers(3).numDataNodes(3).build();
    UTIL.startMiniCluster(option);
  }

  @AfterAll
  public static void tearDownAfterClass() throws Exception {
    UTIL.shutdownMiniCluster();
  }

  @Test
  public void testStopActiveMaster() throws Exception {
    try (Connection conn = ConnectionFactory.createConnection(UTIL.getConfiguration());
      RegionLocator locator = conn.getRegionLocator(TableName.META_TABLE_NAME)) {
      ServerName oldMetaServer = locator.getAllRegionLocations().get(0).getServerName();
      ServerName oldMaster = UTIL.getMiniHBaseCluster().getMaster().getServerName();

      UTIL.getMiniHBaseCluster().getMaster().stop("Stop master for test");
      long startTime = EnvironmentEdgeManager.currentTime();
      while (
        UTIL.getMiniHBaseCluster().getMaster() == null
          || UTIL.getMiniHBaseCluster().getMaster().getServerName().equals(oldMaster)
      ) {
        LOG.info("Wait the standby master become active");
        Thread.sleep(3000);
        if (EnvironmentEdgeManager.currentTime() - startTime > WAIT_TIMEOUT) {
          fail("Wait too long for standby master become active");
        }
      }
      startTime = EnvironmentEdgeManager.currentTime();
      while (!UTIL.getMiniHBaseCluster().getMaster().isInitialized()) {
        LOG.info("Wait the new active master to be initialized");
        Thread.sleep(3000);
        if (EnvironmentEdgeManager.currentTime() - startTime > WAIT_TIMEOUT) {
          fail("Wait too long for the new active master to be initialized");
        }
      }

      ServerName newMetaServer = locator.getAllRegionLocations().get(0).getServerName();
      assertTrue(newMetaServer.equals(oldMetaServer), "The new meta server " + newMetaServer
        + " should be same with" + " the old meta server " + oldMetaServer);
    }
  }
}
