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   * distributed with this work for additional information
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   * 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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  package org.apache.cassandra.distributed.upgrade;
  
  import com.google.common.collect.Streams;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.api.Feature;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.distributed.api.IUpgradeableInstance;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.tcm.ClusterMetadata;
  
  public class ClusterMetadataUpgradeAssassinateTest extends UpgradeTestBase
  {
      @Test
      public void simpleUpgradeTest() throws Throwable
      {
          new TestCase()
          .nodes(3)
          .nodesToUpgrade(1, 2)
          .withConfig((cfg) -> cfg.with(Feature.NETWORK, Feature.GOSSIP))
          .upgradesToCurrentFrom(v50)
          .setup((cluster) -> {
              cluster.schemaChange("CREATE TABLE " + KEYSPACE + ".tbl (pk int, ck int, v int, PRIMARY KEY (pk, ck))");
              cluster.get(3).shutdown().get();
              cluster.get(1).nodetoolResult("assassinate", "127.0.0.3").asserts().success();
          })
          .runAfterClusterUpgrade((cluster) -> {
              checkPlacements(cluster.get(1), false);
              checkPlacements(cluster.get(2), false);
              cluster.get(1).nodetoolResult("cms", "initialize").asserts().success();
              checkPlacements(cluster.get(1), false);
              checkPlacements(cluster.get(2), false);
          }).run();
      }
      static void checkPlacements(IUpgradeableInstance i, boolean shouldExist)
      {
          checkPlacements(i, "127.0.0.3", shouldExist);
      }
      static void checkPlacements(IUpgradeableInstance i, String host, boolean shouldExist)
      {
          ((IInvokableInstance) i).runOnInstance(() -> {
              ClusterMetadata metadata = ClusterMetadata.current();
              InetAddressAndPort ep = InetAddressAndPort.getByNameUnchecked(host);
              metadata.placements.asMap().forEach((key, value) -> {
                  if (key.isMeta())
                      return;
                  boolean existsInPlacements = Streams.concat(value.reads.endpoints.stream(),
                                                              value.writes.endpoints.stream())
                                                      .anyMatch(fr -> fr.endpoints().contains(ep));
                  if (shouldExist != existsInPlacements)
                      throw new IllegalStateException(ep + " should" + (shouldExist ? "" : " not")+ " be in placements " + key + " : " + value);
  
              });
          });
      }
  }
  