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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
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  package org.apache.cassandra.distributed.upgrade;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.UUID;
  import java.util.concurrent.TimeUnit;
  
  import com.google.common.util.concurrent.Uninterruptibles;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Constants;
  import org.apache.cassandra.distributed.UpgradeableCluster;
  import org.apache.cassandra.distributed.api.Feature;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.tcm.membership.NodeId;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.psjava.util.AssertStatus.assertTrue;
  
  public class ClusterMetadataUpgradeHostIdTest extends UpgradeTestBase
  {
      @Test
      public void upgradeHostIdUpdateTest() throws Throwable
      {
          Map<InetAddressAndPort, UUID> expectedUUIDs = new HashMap<>();
          new TestCase()
          .nodes(3)
          .nodesToUpgrade(1, 2, 3)
          .withConfig((cfg) -> cfg.with(Feature.NETWORK, Feature.GOSSIP)
                                  .set(Constants.KEY_DTEST_FULL_STARTUP, true))
          .upgradesToCurrentFrom(v41)
          .setup((cluster) -> {
              cluster.schemaChange(withKeyspace("ALTER KEYSPACE %s WITH replication = {'class': 'SimpleStrategy', 'replication_factor':2}"));
              cluster.schemaChange("CREATE TABLE " + KEYSPACE + ".tbl (pk int, ck int, v int, PRIMARY KEY (pk, ck))");
              expectedUUIDs.putAll(getHostIds(cluster, 1));
              for (UUID hostId : expectedUUIDs.values())
                  assertFalse(NodeId.isValidNodeId(hostId));
          })
          .runAfterClusterUpgrade((cluster) -> {
              for (int i = 1; i <= 3; i++)
                  assertEquals(expectedUUIDs, getHostIds(cluster, i));
  
              cluster.get(1).nodetoolResult("cms", "initialize").asserts().success();
  
              Map<InetAddressAndPort, UUID> postUpgradeUUIDs = new HashMap<>(getHostIds(cluster, 1));
              boolean found = false;
              for (int i = 0; i < 20; i++)
              {
                  if (postUpgradeUUIDs.values().stream().allMatch(NodeId::isValidNodeId))
                  {
                      found = true;
                      break;
                  }
                  System.out.println("NOT ALL VALID: "+postUpgradeUUIDs);
                  Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
                  postUpgradeUUIDs = new HashMap<>(getHostIds(cluster, 1));
              }
              assertTrue(found);
  
              for (int i = 2; i <= 3; i++)
                  while(!getHostIds(cluster, i).equals(postUpgradeUUIDs))
                      Uninterruptibles.sleepUninterruptibly(100, TimeUnit.MILLISECONDS);
          }).run();
      }
  
      private static Map<InetAddressAndPort, UUID> getHostIds(UpgradeableCluster cluster, int instance)
      {
          String gossipInfo = cluster.get(instance).nodetoolResult("gossipinfo").getStdout();
          InetAddressAndPort host = null;
          Map<InetAddressAndPort, UUID> hostIds = new HashMap<>();
          for (String l : gossipInfo.split("\n"))
          {
              if (l.startsWith("/"))
                  host = InetAddressAndPort.getByNameUnchecked(l.replace("/", ""));
  
              if (l.contains("HOST_ID"))
              {
                  String hostIdStr = l.split(":")[2];
                  hostIds.put(host, UUID.fromString(hostIdStr));
              }
          }
          return hostIds;
      }
  }
  