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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;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.Callable;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import com.google.common.util.concurrent.Uninterruptibles;
  import org.junit.Test;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import net.bytebuddy.ByteBuddy;
  import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
  import net.bytebuddy.implementation.MethodDelegation;
  import net.bytebuddy.implementation.bind.annotation.SuperCall;
  import org.apache.cassandra.db.Directories;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.ConsistencyLevel;
  import org.apache.cassandra.service.ActiveRepairService;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static org.apache.cassandra.distributed.api.Feature.GOSSIP;
  import static org.apache.cassandra.distributed.api.Feature.NETWORK;
  import static org.junit.Assert.assertFalse;
  
  public class ClearSnapshotTest extends TestBaseImpl
  {
      private static final Logger logger = LoggerFactory.getLogger(ClearSnapshotTest.class);
  
      @Test
      public void clearSnapshotSlowTest() throws IOException, InterruptedException, ExecutionException
      {
          try (Cluster cluster = init(Cluster.build(3).withConfig(config ->
                                                                  config.with(GOSSIP)
                                                                        .with(NETWORK))
                                            .withInstanceInitializer(BB::install)
                                            .start()))
          {
              int tableCount = 20;
              for (int i = 0; i < tableCount; i++)
              {
                  String ksname = "ks"+i;
                  cluster.schemaChange("create keyspace "+ksname+" with replication = {'class': 'SimpleStrategy', 'replication_factor': 3}");
                  cluster.schemaChange("create table "+ksname+".tbl (id int primary key, t int)");
                  cluster.get(1).executeInternal("insert into "+ksname+".tbl (id , t) values (?, ?)", i, i);
                  cluster.forEach((node) -> node.flush(ksname));
              }
              List<Thread> repairThreads = new ArrayList<>();
              for (int i = 0; i < tableCount; i++)
              {
                  String ksname = "ks"+i;
                  Thread t = new Thread(() -> cluster.get(1).nodetoolResult("repair", "-full", ksname).asserts().success());
                  t.start();
                  repairThreads.add(t);
              }
              AtomicBoolean gotExc = new AtomicBoolean(false);
              AtomicBoolean exit = new AtomicBoolean(false);
              Thread reads = new Thread(() -> {
                  while (!exit.get())
                  {
                      try
                      {
                          cluster.coordinator(1).execute("select * from ks1.tbl where id = 5", ConsistencyLevel.QUORUM);
                          Uninterruptibles.sleepUninterruptibly(10, TimeUnit.MILLISECONDS);
                      }
                      catch (Exception e)
                      {
                          if (!gotExc.get())
                              logger.error("Unexpected exception querying table ks1.tbl", e);
                          gotExc.set(true);
                      }
                  }
              });
  
              reads.start();
              long activeRepairs;
              do
              {
                  activeRepairs = cluster.get(1).callOnInstance(() -> ActiveRepairService.instance().parentRepairSessionCount());
                  Thread.sleep(50);
              }
              while (activeRepairs < 10);
  
              cluster.setUncaughtExceptionsFilter((t) -> t.getMessage() != null && t.getMessage().contains("Parent repair session with id") );
              cluster.get(2).shutdown().get();
              repairThreads.forEach(t -> {
                  try
                  {
                      t.join();
                  }
                  catch (InterruptedException e)
                  {
                      throw new RuntimeException(e);
                  }
              });
              exit.set(true);
              reads.join();
  
              assertFalse(gotExc.get());
          }
      }
  
      public static class BB
      {
          public static void install(ClassLoader classLoader, Integer num)
          {
              new ByteBuddy().rebase(Directories.class)
                             .method(named("snapshotExists"))
                             .intercept(MethodDelegation.to(BB.class))
                             .make()
                             .load(classLoader, ClassLoadingStrategy.Default.INJECTION);
  
          }
  
          @SuppressWarnings("unused")
          public static boolean snapshotExists(String name, @SuperCall Callable<Boolean> zuper)
          {
              Uninterruptibles.sleepUninterruptibly(1, TimeUnit.SECONDS);
              try
              {
                  return zuper.call();
              }
              catch (Exception e)
              {
                  throw new RuntimeException(e);
              }
          }
      }
  
      @Test
      public void testSeqClearsSnapshot() throws IOException, TimeoutException
      {
          try(Cluster cluster = init(Cluster.build(3).withConfig(config ->
                                                                 config.with(GOSSIP)
                                                                       .with(NETWORK))
                                            .start()))
          {
              cluster.schemaChange(withKeyspace("create table %s.tbl (id int primary key, x int)"));
              for (int i = 0; i < 10; i++)
                  cluster.get(1).executeInternal(withKeyspace("insert into %s.tbl (id, x) values (?, ?)"), i, i);
              cluster.get(1).nodetoolResult("repair", "-seq", "-full", KEYSPACE).asserts().success();
              cluster.get(1).logs().watchFor("Clearing snapshot");
          }
      }
  }
  