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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.distributed.upgrade;
  
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Constants;
  import org.apache.cassandra.distributed.api.Feature;
  import org.apache.cassandra.distributed.api.IInstanceConfig;
  import org.apache.cassandra.distributed.api.IUpgradeableInstance;
  import org.apache.cassandra.distributed.api.TokenSupplier;
  import org.apache.cassandra.distributed.impl.AbstractCluster;
  import org.apache.cassandra.distributed.shared.NetworkTopology;
  
  public class ClusterMetadataUpgradeChangeIPTest extends UpgradeTestBase
  {
      @Test
      public void gossipModeIPChangeTest() throws Throwable
      {
          // all nodes upgraded, bouncing node3 to new ip while in gossip mode
          ipChangeTestHelper(1, 2, 3);
      }
  
      @Test
      public void upgradeChangeIPTest() throws Throwable
      {
          // changing IP while upgrading node 3
          ipChangeTestHelper(1, 2);
      }
  
      private void ipChangeTestHelper(int ... toUpgrade) throws Throwable
      {
          TokenSupplier ts = TokenSupplier.evenlyDistributedTokens(3);
          new TestCase()
          .nodesToUpgrade(toUpgrade)
          .withConfig((cfg) -> cfg.with(Feature.NETWORK, Feature.GOSSIP)
                                  .set(Constants.KEY_DTEST_FULL_STARTUP, true))
          .withBuilder(builder -> builder.withNodeIdTopology(NetworkTopology.singleDcNetworkTopology(4, "dc0", "rack0"))
                                         .withTokenSupplier((TokenSupplier) i -> i == 4 ? ts.tokens(3) : ts.tokens(i)))
          .nodes(3)
          .upgradesToCurrentFrom(v50)
          .setup((cluster) -> {})
          .runAfterClusterUpgrade((cluster) -> {
              cluster.get(3).shutdown().get();
              IInstanceConfig nodeConfig = cluster.newInstanceConfig();
              nodeConfig.set("data_file_directories", cluster.get(3).config().get("data_file_directories"));
              IUpgradeableInstance newInstance = cluster.bootstrap(nodeConfig, AbstractCluster.CURRENT_VERSION);
              newInstance.startup();
              cluster.get(1).nodetoolResult("cms", "initialize").asserts().success();
  
              cluster.get(2).shutdown().get();
              cluster.get(2).startup();
  
              cluster.get(2).nodetoolResult("cms", "reconfigure", "3").asserts().success();
          }).run();
      }
  }
  