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   * "License"); you may not use this file except in compliance
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   *
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  package org.apache.cassandra.repair;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  import java.util.stream.LongStream;
  
  import org.junit.Test;
  
  import accord.utils.Gen;
  import accord.utils.Gens;
  import org.agrona.collections.LongArrayList;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.config.RetrySpec;
  import org.apache.cassandra.utils.Closeable;
  
  import static accord.utils.Property.qt;
  
  public class HappyPathFuzzTest extends FuzzTestBase
  {
      @Test
      public void happyPath()
      {
          // disable all retries, no delays/drops are possible
          DatabaseDescriptor.getRepairRetrySpec().maxAttempts = RetrySpec.MaxAttempt.DISABLED;
          Map<String, LongArrayList> repairTypeRuntimes = new HashMap<>();
          long realStartNanos = System.nanoTime();
          qt().withPure(false).withExamples(10).check(rs -> {
              Cluster cluster = new Cluster(rs);
              Gen<Cluster.Node> coordinatorGen = Gens.pick(cluster.nodes.keySet()).map(cluster.nodes::get);
  
              List<Closeable> closeables = new ArrayList<>();
              for (int example = 0; example < 100; example++)
              {
                  Cluster.Node coordinator = coordinatorGen.next(rs);
  
                  long nowNanos = System.nanoTime();
                  RepairCoordinator repair = coordinator.repair(KEYSPACE, repairOption(rs, coordinator, KEYSPACE, TABLES));
                  repair.run();
                  boolean shouldSync = rs.nextBoolean();
                  if (shouldSync)
                      closeables.add(cluster.nodes.get(pickParticipant(rs, coordinator, repair)).doValidation((cfs, validator) -> addMismatch(rs, cfs, validator)));
  
                  runAndAssertSuccess(cluster, example, shouldSync, repair);
                  repairTypeRuntimes.computeIfAbsent(repair.state.getType(), ignore -> new LongArrayList()).addLong(System.nanoTime() - nowNanos);
                  closeables.forEach(Closeable::close);
                  closeables.clear();
              }
          });
          long realDurationNanos = System.nanoTime() - realStartNanos;
          long repairDurationsNanos = 0;
          StringBuilder sb = new StringBuilder();
          for (Map.Entry<String, LongArrayList> e : repairTypeRuntimes.entrySet())
          {
              sb.append(e.getKey());
              long[] times = e.getValue().toLongArray();
              repairDurationsNanos += LongStream.of(times).sum();
              Arrays.sort(times);
              long min = times[0];
              long median = times[times.length / 2];
              long max = times[times.length - 1];
              sb.append(": min=").append(TimeUnit.NANOSECONDS.toMillis(min))
                .append(", median=").append(TimeUnit.NANOSECONDS.toMillis(median))
                .append(", max=").append(TimeUnit.NANOSECONDS.toMillis(max))
                .append(", count=").append(times.length)
                .append('\n');
          }
          logger.info("Repair runtimes (in millis):\nTest Duration {}\nRepair Duration {}\n{}", TimeUnit.NANOSECONDS.toMillis(realDurationNanos), TimeUnit.NANOSECONDS.toMillis(repairDurationsNanos), sb);
      }
  }
  