content: /*
   * 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.accord;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.BitSet;
  import java.util.Comparator;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  import java.util.Random;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.RejectedExecutionException;
  import java.util.concurrent.Semaphore;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import com.google.common.util.concurrent.RateLimiter;
  import org.junit.BeforeClass;
  import org.junit.Ignore;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.config.CassandraRelevantProperties;
  import org.apache.cassandra.db.commitlog.CommitLog;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.ConsistencyLevel;
  import org.apache.cassandra.distributed.api.Feature;
  import org.apache.cassandra.distributed.api.ICoordinator;
  import org.apache.cassandra.distributed.api.IMessage;
  import org.apache.cassandra.distributed.api.IMessageFilters;
  import org.apache.cassandra.distributed.shared.DistributedTestBase;
  import org.apache.cassandra.net.Verb;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.service.accord.AccordKeyspace;
  import org.apache.cassandra.service.accord.AccordService;
  import org.apache.cassandra.utils.EstimatedHistogram;
  
  import static java.lang.System.currentTimeMillis;
  import static java.util.concurrent.TimeUnit.MILLISECONDS;
  import static java.util.concurrent.TimeUnit.NANOSECONDS;
  import static java.util.concurrent.TimeUnit.SECONDS;
  import static org.apache.cassandra.db.ColumnFamilyStore.FlushReason.UNIT_TESTS;
  
  public class AccordLoadTest extends AccordTestBase
  {
      private static final Logger logger = LoggerFactory.getLogger(AccordLoadTest.class);
  
      @BeforeClass
      public static void setUp() throws IOException
      {
          CassandraRelevantProperties.SIMULATOR_STARTED.setString(Long.toString(MILLISECONDS.toSeconds(currentTimeMillis())));
  //        AccordTestBase.setupCluster(builder -> builder, 3);
          AccordTestBase.setupCluster(builder -> builder.withConfig(config -> config
                                                                              .with(Feature.NETWORK, Feature.GOSSIP)
                                                                              .set("accord.shard_durability_target_splits", "8")
                                                                              .set("accord.shard_durability_max_splits", "16")
                                                                              .set("accord.shard_durability_cycle", "1m")
  //                                                                            .set("accord.ephemeral_read_enabled", "true")
                                                                               ), 3);
      }
  
      @Ignore
      @Test
      public void testLoad() throws Exception
      {
          Cluster cluster = SHARED_CLUSTER;
          cluster.schemaChange("CREATE TABLE " + qualifiedAccordTableName + " (k int, v int, PRIMARY KEY(k)) WITH transactional_mode = 'full'");
  
          try
          {
  
              final ConcurrentHashMap<Verb, AtomicInteger> verbs = new ConcurrentHashMap<>();
              cluster.filters().outbound().messagesMatching(new IMessageFilters.Matcher()
              {
                  @Override
                  public boolean matches(int i, int i1, IMessage iMessage)
                  {
                      verbs.computeIfAbsent(Verb.fromId(iMessage.verb()), ignore -> new AtomicInteger()).incrementAndGet();
                      return false;
                  }
              }).drop();
  
              ICoordinator coordinator = cluster.coordinator(1);
              final int repairInterval = Integer.MAX_VALUE;
              final int compactionInterval = 20_000;
  //            final int flushInterval = 50_000;
              final int journalFlushInterval = 2_000;
              final int cfkFlushInterval = 10_000;
              final int dataFlushInterval = 10_000;
              final int compactionPeriodSeconds = 0;
              int restartInterval = 30_000;
              final int restartDecay = 2;
  //            final int restartInterval = Integer.MAX_VALUE;
              final int batchSizeLimit = 200;
              final long batchTime = TimeUnit.SECONDS.toNanos(10);
              final int concurrency = 100;
              final int ratePerSecond = 1000;
  //            final int keyCount = 10_000;
              final int keyCount = 10;
              final float readChance = 0.33f;
              long nextRepairAt = repairInterval;
              long nextCompactionAt = compactionInterval;
              long nextJournalFlushAt = journalFlushInterval;
              long nextDataFlushAt = dataFlushInterval;
              long nextCfkFlushAt = cfkFlushInterval;
              long nextRestartAt = restartInterval;
              final ExecutorService restartExecutor = Executors.newSingleThreadExecutor();
              final BitSet initialised = new BitSet();
  
              cluster.get(1).nodetoolResult("cms", "reconfigure", "3").asserts().success();
              cluster.forEach(i -> i.runOnInstance(() -> {
                  if (compactionPeriodSeconds > 0)
                      ((AccordService) AccordService.instance()).journal().compactor().updateCompactionPeriod(1, SECONDS);
  //                  ((AccordSpec.JournalSpec)((AccordService) AccordService.instance()).journal().configuration()).segmentSize = 128 << 10;
              }));
  
              Random random = new Random();
              final Semaphore inFlight = new Semaphore(concurrency);
              final RateLimiter rateLimiter = RateLimiter.create(ratePerSecond);
              while (true)
              {
                  final EstimatedHistogram histogram = new EstimatedHistogram(200);
                  long batchStart = System.nanoTime();
                  long batchEnd = batchStart + batchTime;
                  int batchSize = 0;
                  while (batchSize < batchSizeLimit)
                  {
                      inFlight.acquire();
                      rateLimiter.acquire();
                      try
                      {
                          long commandStart = System.nanoTime();
                          int k = random.nextInt(keyCount);
                          if (random.nextFloat() < readChance)
                          {
                              coordinator.executeWithResult((success, fail) -> {
                                  inFlight.release();
                                  if (fail == null) histogram.add(NANOSECONDS.toMicros(System.nanoTime() - commandStart));
                              }, "SELECT * FROM " + qualifiedAccordTableName + " WHERE k = ?;", ConsistencyLevel.SERIAL, k);
                          }
                          else if (initialised.get(k))
                          {
                              coordinator.executeWithResult((success, fail) -> {
                                  inFlight.release();
                                  if (fail == null) histogram.add(NANOSECONDS.toMicros(System.nanoTime() - commandStart));
                              }, "UPDATE " + qualifiedAccordTableName + " SET v += 1 WHERE k = ? IF EXISTS;", ConsistencyLevel.SERIAL, ConsistencyLevel.QUORUM, k);
                          }
                          else
                          {
                              initialised.set(k);
                              coordinator.executeWithResult((success, fail) -> {
                                  inFlight.release();
                                  if (fail == null) histogram.add(NANOSECONDS.toMicros(System.nanoTime() - commandStart));
                                  //                             else exceptions.add(fail);
                              }, "UPDATE " + qualifiedAccordTableName + " SET v = 0 WHERE k = ? IF NOT EXISTS;", ConsistencyLevel.SERIAL, ConsistencyLevel.QUORUM, k);
                          }
                      }
                      catch (RejectedExecutionException e)
                      {
                          inFlight.release();
                          while (true)
                          {
                              try
                              {
                                  int index = 1 + random.nextInt(cluster.size());
                                  logger.info("Picking new coordinator ... {}", index);
                                  coordinator = cluster.coordinator(index);
                                  if (cluster.get(index).callOnInstance(() -> AccordService.started()))
                                      break;
                              }
                              catch (Throwable t) { logger.info("Failed to select coordinator", t); }
                          }
                      }
                      batchSize++;
                      if (System.nanoTime() >= batchEnd)
                          break;
                  }
  
                  if ((nextRepairAt -= batchSize) <= 0)
                  {
                      nextRepairAt += repairInterval;
                      System.out.println("repairing...");
                      cluster.coordinator(1).instance().nodetool("repair", qualifiedAccordTableName);
                  }
  
                  if ((nextCompactionAt -= batchSize) <= 0)
                  {
                      nextCompactionAt += compactionInterval;
                      System.out.println("compacting accord...");
                      cluster.forEach(i -> {
                          try { i.nodetool("compact", "system_accord.journal"); }
                          catch (Throwable t) { logger.error("", t); }
                      });
                  }
  
                  if ((nextJournalFlushAt -= batchSize) <= 0)
                  {
                      nextJournalFlushAt += journalFlushInterval;
                      System.out.println("flushing journal...");
                      cluster.forEach(i -> {
                          try
                          {
                              i.runOnInstance(() -> {
                                  if (AccordService.started())
                                      ((AccordService) AccordService.instance()).journal().closeCurrentSegmentForTestingIfNonEmpty();
                              });
                          }
                          catch (Throwable t)
                          {
                              logger.error("", t);
                          }
                      });
                  }
  
                  if ((nextDataFlushAt -= batchSize) <= 0)
                  {
                      nextDataFlushAt += dataFlushInterval;
                      System.out.println("flushing data...");
                      cluster.forEach(i -> {
                          try
                          {
                              i.acceptOnInstance(name -> {
                                  Schema.instance.getColumnFamilyStoreInstance(Schema.instance.getTableMetadata(KEYSPACE, name).id).forceFlush(UNIT_TESTS);
                              }, accordTableName);
                          }
                          catch (Throwable t)
                          {
                              logger.error("", t);
                          }
                      });
                  }
  
                  if ((nextCfkFlushAt -= batchSize) <= 0)
                  {
                      nextCfkFlushAt += cfkFlushInterval;
                      System.out.println("flushing data...");
                      cluster.forEach(i -> {
                          try
                          {
                              i.acceptOnInstance(name -> {
                                  if (CommitLog.instance.isStarted())
                                      AccordKeyspace.AccordColumnFamilyStores.commandsForKey.forceFlush(UNIT_TESTS);
                              }, accordTableName);
                          }
                          catch (Throwable t)
                          {
                              logger.error("", t);
                          }
                      });
                  }
  
                  if ((nextRestartAt -= batchSize) <= 0)
                  {
                      nextRestartAt += restartInterval;
                      restartInterval = Math.max(restartInterval, restartInterval * restartDecay);
                      int nodeIdx = 1 + random.nextInt(cluster.size());
                      restartExecutor.submit(() -> {
                          System.out.printf("restarting node %d...\n", nodeIdx);
                          try
                          {
                              cluster.get(nodeIdx).shutdown().get();
                              cluster.get(nodeIdx).startup();
                              while (!cluster.get(nodeIdx).callOnInstance(() -> AccordService.started()))
                                  Thread.sleep(1000);
                              return null;
                          }
                          catch (InterruptedException | ExecutionException e)
                          {
                              throw new RuntimeException(e);
                          }
                      });
                  }
  
                  final Date date = new Date();
                  System.out.printf("%tT rate: %.2f/s (%d total)\n", date, (((float)batchSizeLimit * 1000) / NANOSECONDS.toMillis(System.nanoTime() - batchStart)), batchSize);
                  System.out.printf("%tT percentiles: %d %d %d %d\n", date, histogram.percentile(.25)/1000, histogram.percentile(.5)/1000, histogram.percentile(.75)/1000, histogram.percentile(1)/1000);
  
                  class VerbCount
                  {
                      final Verb verb;
                      final int count;
  
                      VerbCount(Verb verb, int count)
                      {
                          this.verb = verb;
                          this.count = count;
                      }
                  }
                  List<VerbCount> verbCounts = new ArrayList<>();
                  for (Map.Entry<Verb, AtomicInteger> e : verbs.entrySet())
                  {
                      int count = e.getValue().getAndSet(0);
                      if (count != 0) verbCounts.add(new VerbCount(e.getKey(), count));
                  }
                  verbCounts.sort(Comparator.comparing(v -> -v.count));
  
                  StringBuilder verbSummary = new StringBuilder();
                  for (VerbCount vs : verbCounts)
                  {
                      {
                          if (verbSummary.length() > 0)
                              verbSummary.append(", ");
                          verbSummary.append(vs.verb);
                          verbSummary.append(": ");
                          verbSummary.append(vs.count);
                      }
                  }
                  System.out.printf("%tT verbs: %s\n", date, verbSummary);
              }
          }
          catch (Throwable t)
          {
              t.printStackTrace();
              System.exit(1);
          }
      }
  
      @Override
      protected Logger logger()
      {
          return logger;
      }
  
      public static void main(String[] args) throws Throwable
      {
          DistributedTestBase.beforeClass();
          AccordLoadTest.setUp();
          AccordLoadTest test = new AccordLoadTest();
          test.setup();
          test.testLoad();
      }
  }
  