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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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   *
   *     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.test.ring;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.locks.LockSupport;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.shared.ClusterUtils;
  import org.apache.cassandra.distributed.test.TestBaseImpl;
  
  import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
  import static org.apache.cassandra.distributed.api.Feature.NATIVE_PROTOCOL;
  import static org.apache.cassandra.distributed.api.Feature.NETWORK;
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  
  public class CommunicationDuringDecommissionTest extends TestBaseImpl
  {
      @Test
      public void internodeConnectionsDuringDecom() throws Throwable
      {
          try (Cluster cluster = builder().withNodes(4)
                                          .withConfig(config -> config.with(NETWORK, GOSSIP, NATIVE_PROTOCOL))
                                          .start())
          {
              BootstrapTest.populate(cluster, 0, 100);
  
              int decomissioningNode = 4;
              cluster.get(decomissioningNode).nodetoolResult("decommission").asserts().success();
              cluster.filters().allVerbs().from(decomissioningNode).messagesMatching((i, i1, iMessage) -> {
                  throw new AssertionError("Decomissioned node should not send any messages");
              }).drop();
  
              ClusterUtils.waitForCMSToQuiesce(cluster, cluster.get(1), decomissioningNode);
              Map<Integer, Long> connectionAttempts = new HashMap<>();
              long deadline = currentTimeMillis() + TimeUnit.SECONDS.toMillis(10);
  
              // Wait 10 seconds and check if there are any new connection attempts to the decomissioned node
              while (currentTimeMillis() <= deadline)
              {
                  for (int i = 1; i <= 3; i++)
                  {
                      Object[][] res = cluster.get(i).executeInternal("SELECT active_connections, connection_attempts FROM system_views.internode_outbound WHERE address = '127.0.0.4' AND port = 7012");
                      Assert.assertEquals(1, res.length);
                      Assert.assertEquals(0L, ((Long) res[0][0]).longValue());
                      long attempts = ((Long) res[0][1]).longValue();
                      if (connectionAttempts.get(i) == null)
                          connectionAttempts.put(i, attempts);
                      else
                          Assert.assertEquals(String.format("Number of connection attempts from %d to %d should have been stable but changed from %d to %d",
                                                            i, decomissioningNode, connectionAttempts.get(i), attempts),
                                              connectionAttempts.get(i), (Long) attempts);
                  }
                  LockSupport.parkNanos(TimeUnit.MILLISECONDS.toNanos(100));
              }
          }
      }
  }
  