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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
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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
   * distributed under the License is distributed on an "AS IS" BASIS,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.db.compaction;
  
  import java.util.Random;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import com.google.common.util.concurrent.Uninterruptibles;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.utils.Hex;
  
  import static org.apache.cassandra.config.CassandraRelevantProperties.TEST_STRICT_LCS_CHECKS;
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  
  public class LongLeveledCompactionStrategyCQLTest extends CQLTester
  {
  
      @Test
      public void stressTestCompactionStrategyManager() throws ExecutionException, InterruptedException
      {
          TEST_STRICT_LCS_CHECKS.setBoolean(true);
          // flush/compact tons of sstables, invalidate token metadata in a loop to make CSM reload the strategies
          createTable("create table %s (id int primary key, i text) with compaction = {'class':'LeveledCompactionStrategy', 'sstable_size_in_mb':1}");
          ExecutorService es = Executors.newSingleThreadExecutor();
          DatabaseDescriptor.setConcurrentCompactors(8);
          AtomicBoolean stop = new AtomicBoolean(false);
          long start = currentTimeMillis();
          try
          {
              Random r = new Random();
              Future<?> writes = es.submit(() -> {
  
                  byte[] b = new byte[1024];
                  while (!stop.get())
                  {
  
                      for (int i = 0 ; i < 100; i++)
                      {
                          try
                          {
                              r.nextBytes(b);
                              String s = Hex.bytesToHex(b);
                              execute("insert into %s (id, i) values (?,?)", r.nextInt(), s);
                          }
                          catch (Throwable throwable)
                          {
                              throw new RuntimeException(throwable);
                          }
                      }
                      getCurrentColumnFamilyStore().forceBlockingFlush(ColumnFamilyStore.FlushReason.UNIT_TESTS);
                      Uninterruptibles.sleepUninterruptibly(r.nextInt(200), TimeUnit.MILLISECONDS);
                  }
              });
  
              while(currentTimeMillis() - start < TimeUnit.MILLISECONDS.convert(5, TimeUnit.MINUTES))
              {
  //                StorageService.instance.getTokenMetadata().invalidateCachedRings();
                  Uninterruptibles.sleepUninterruptibly(r.nextInt(1000), TimeUnit.MILLISECONDS);
              }
  
              stop.set(true);
              writes.get();
          }
          finally
          {
              es.shutdown();
          }
      }
  }
  