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   * 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.cassandra.distributed.test.streaming;
  
  import java.io.IOException;
  import java.util.Set;
  
  import org.junit.Test;
  
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.ConsistencyLevel;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.distributed.test.TestBaseImpl;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  
  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.junit.Assert.assertTrue;
  
  public class LCSStreamingKeepLevelTest extends TestBaseImpl
  {
      @Test
      public void testDecom() throws IOException
      {
          try (Cluster cluster = builder().withNodes(4)
                                          .withConfig(config -> config.with(NETWORK, GOSSIP, NATIVE_PROTOCOL))
                                          .withoutVNodes()
                                          .withDataDirCount(1)
                                          .start())
          {
              populate(cluster);
  
              cluster.get(4).nodetoolResult("decommission").asserts().success();
  
              assertEmptyL0(cluster);
          }
      }
  
      @Test
      public void testMove() throws IOException
      {
          try (Cluster cluster = builder().withNodes(4)
                                          .withConfig(config -> config.with(NETWORK, GOSSIP, NATIVE_PROTOCOL))
                                          .withoutVNodes()
                                          .withDataDirCount(1)
                                          .start())
          {
              populate(cluster);
  
              long tokenVal = ((Murmur3Partitioner.LongToken)cluster.tokens().get(3).getToken()).token;
              long prevTokenVal = ((Murmur3Partitioner.LongToken)cluster.tokens().get(2).getToken()).token;
              // move node 4 to the middle point between its current position and the previous node
              long newToken = (tokenVal + prevTokenVal) / 2;
              cluster.get(4).nodetoolResult("move", String.valueOf(newToken)).asserts().success();
  
              assertEmptyL0(cluster);
          }
      }
  
      private static void populate(Cluster cluster)
      {
          cluster.schemaChange(withKeyspace("CREATE KEYSPACE %s WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 2}"));
          cluster.schemaChange(withKeyspace("CREATE TABLE %s.decom_test (id int PRIMARY KEY, value int) with compaction = { 'class':'LeveledCompactionStrategy', 'enabled':'false' }"));
  
          for (int i = 0; i < 500; i++)
          {
              cluster.coordinator(1).execute(withKeyspace("insert into %s.decom_test (id, value) VALUES (?, ?)"), ConsistencyLevel.ALL, i, i);
              if (i % 100 == 0)
                  cluster.forEach((inst) -> inst.flush(KEYSPACE));
          }
          cluster.forEach((i) -> i.flush(KEYSPACE));
          relevel(cluster);
      }
  
      private static void relevel(Cluster cluster)
      {
          for (IInvokableInstance i : cluster)
          {
              i.runOnInstance(() -> {
                  Set<SSTableReader> sstables = Keyspace.open(KEYSPACE).getColumnFamilyStore("decom_test").getLiveSSTables();
                  int lvl = 1;
                  for (SSTableReader sstable : sstables)
                  {
                      try
                      {
                          sstable.mutateLevelAndReload(lvl++);
                      }
                      catch (IOException e)
                      {
                          throw new RuntimeException(e);
                      }
                  }
              });
          }
  
          assertEmptyL0(cluster);
      }
  
      private static void assertEmptyL0(Cluster cluster)
      {
          for (IInvokableInstance i : cluster)
          {
              i.runOnInstance(() -> {
                  for (SSTableReader sstable : Keyspace.open(KEYSPACE).getColumnFamilyStore("decom_test").getLiveSSTables())
                      assertTrue(sstable.getSSTableLevel() > 0);
              });
          }
      }
  }
  