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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.repair;
  
  import java.io.IOException;
  import java.util.concurrent.TimeUnit;
  
  import com.google.common.collect.ImmutableMap;
  
  import org.apache.cassandra.Util;
  import org.apache.cassandra.metrics.AutoRepairMetrics;
  import org.apache.cassandra.metrics.AutoRepairMetricsManager;
  
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.test.TestBaseImpl;
  import org.apache.cassandra.repair.autorepair.AutoRepair;
  import org.apache.cassandra.repair.autorepair.AutoRepairConfig;
  import org.apache.cassandra.service.AutoRepairService;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static org.hamcrest.Matchers.greaterThan;
  import static org.junit.Assert.assertEquals;
  
  /**
   * Distributed tests for {@link org.apache.cassandra.repair.autorepair.AutoRepair} scheduler's
   * allow_parallel_replica_repair_across_schedules feature.
   */
  public class AutoRepairSchedulerDisallowParallelReplicaRepairAcrossSchedulesTest extends TestBaseImpl
  {
      private static Cluster cluster;
  
      @BeforeClass
      public static void init() throws IOException
      {
          // Configure a cluster with preview and incremental repair enabled in a way that preview repair can be
          // run on all three nodes concurrently, but incremental repair can only be run when there are no parallel
          // repairs.  We should detect contention in the incremental repair scheduler but not preview repaired
          // scheduler as a result.
          cluster = Cluster.build(3)
                           .withConfig(config -> config
                                                 .set("auto_repair",
                                                      ImmutableMap.of(
                                                      "repair_type_overrides",
                                                      ImmutableMap.of(AutoRepairConfig.RepairType.PREVIEW_REPAIRED.getConfigName(),
                                                                      ImmutableMap.of(
                                                                      // Configure preview repair to run frequently to
                                                                      // provoke contention with incremental scheduler.
                                                                      "initial_scheduler_delay", "5s",
                                                                      "enabled", "true",
                                                                      "parallel_repair_count", "3",
                                                                      "allow_parallel_replica_repair", "true",
                                                                      "min_repair_interval", "5s"),
                                                                      AutoRepairConfig.RepairType.INCREMENTAL.getConfigName(),
                                                                      ImmutableMap.of(
                                                                      "initial_scheduler_delay", "5s",
                                                                      "enabled", "true",
                                                                      "parallel_repair_count", "3",
                                                                      // Don't allow parallel replica repair across
                                                                      // schedules
                                                                      "allow_parallel_replica_repair", "false",
                                                                      "allow_parallel_replica_repair_across_schedules", "false",
                                                                      "min_repair_interval", "5s"))))
                                                 .set("auto_repair.enabled", "true")
                                                 .set("auto_repair.global_settings.repair_retry_backoff", "5s")
                                                 .set("auto_repair.repair_task_min_duration", "0s")
                                                 .set("auto_repair.repair_check_interval", "5s"))
                           .start();
  
          cluster.schemaChange("CREATE KEYSPACE IF NOT EXISTS " + KEYSPACE + " WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 3};");
          cluster.schemaChange(withKeyspace("CREATE TABLE %s.tbl (pk int, ck text, v1 int, v2 int, PRIMARY KEY (pk, ck)) WITH read_repair='NONE'"));
      }
  
      @AfterClass
      public static void tearDown()
      {
          cluster.close();
      }
  
      @Test
      public void testScheduler()
      {
          cluster.forEach(i -> i.runOnInstance(() -> {
              try
              {
                  AutoRepairService.setup();
                  AutoRepair.instance.setup();
              }
              catch (Exception e)
              {
                  throw new RuntimeException(e);
              }
          }));
  
          // validate that the repair ran on all nodes
          cluster.forEach(i -> i.runOnInstance(() -> {
              // Expect contention on incremental repair across schedules
              AutoRepairMetrics incrementalMetrics = AutoRepairMetricsManager.getMetrics(AutoRepairConfig.RepairType.INCREMENTAL);
              Util.spinAssert(String.format("%s: AutoRepair has not observed any replica contention in INCREMENTAL repair",
                                            FBUtilities.getJustBroadcastAddress().toString()),
                              greaterThan(0L),
                              incrementalMetrics.repairDelayedBySchedule::getCount,
                              5,
                              TimeUnit.MINUTES);
  
              // No repair contention should be observed for preview repaired since allow_parallel_replica_repair was true
              AutoRepairMetrics previewMetrics = AutoRepairMetricsManager.getMetrics(AutoRepairConfig.RepairType.PREVIEW_REPAIRED);
              assertEquals(0L, previewMetrics.repairDelayedByReplica.getCount());
              assertEquals(0L, previewMetrics.repairDelayedBySchedule.getCount());
          }));
      }
  }
  