content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.job.plan.stress;
  
  import alluxio.collections.Pair;
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.job.RunTaskContext;
  import alluxio.job.SelectExecutorsContext;
  import alluxio.job.plan.PlanDefinition;
  import alluxio.job.util.SerializationUtils;
  import alluxio.resource.CloseableResource;
  import alluxio.stress.BaseParameters;
  import alluxio.stress.TaskResult;
  import alluxio.stress.job.StressBenchConfig;
  import alluxio.stress.worker.UfsIOParameters;
  import alluxio.underfs.UnderFileSystem;
  import alluxio.underfs.UnderFileSystemConfiguration;
  import alluxio.util.JsonSerializable;
  import alluxio.util.ShellUtils;
  import alluxio.wire.MountPointInfo;
  import alluxio.wire.WorkerInfo;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.Lists;
  import com.google.common.collect.Sets;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.atomic.AtomicReference;
  import java.util.stream.Collectors;
  
  /**
   * The definition for the stress bench job, which runs distributed benchmarks.
   *
   * {@link StressBenchConfig} is the configuration class, each task takes a List&lt;String&gt; as a
   * list of command-line arguments to the benchmark command, and each task returns the string output.
   */
  public final class StressBenchDefinition
      implements PlanDefinition<StressBenchConfig, ArrayList<String>, String> {
    private static final Logger LOG = LoggerFactory.getLogger(StressBenchDefinition.class);
  
    /**
     * Constructs a new instance.
     */
    public StressBenchDefinition() {
    }
  
    @Override
    public Class<StressBenchConfig> getJobConfigClass() {
      return StressBenchConfig.class;
    }
  
    @Override
    public Set<Pair<WorkerInfo, ArrayList<String>>> selectExecutors(StressBenchConfig config,
        List<WorkerInfo> jobWorkerInfoList, SelectExecutorsContext context) {
      Set<Pair<WorkerInfo, ArrayList<String>>> result = Sets.newHashSet();
  
      // sort copy of workers by hashcode
      List<WorkerInfo> workerList = Lists.newArrayList(jobWorkerInfoList);
      workerList.sort(Comparator.comparing(w -> w.getAddress().getHost()));
      // take the first subset, according to cluster limit
      int clusterLimit = config.getClusterLimit();
      if (clusterLimit == 0) {
        clusterLimit = workerList.size();
      }
      if (clusterLimit < 0) {
        // if negative, reverse the list
        clusterLimit = -clusterLimit;
        Collections.reverse(workerList);
      }
      workerList = workerList.subList(0, clusterLimit);
  
      for (WorkerInfo worker : workerList) {
        LOG.info("Generating job for worker {}", worker.getId());
        ArrayList<String> args = new ArrayList<>(2);
        // Add the worker hostname + worker id as the unique task id for each distributed task.
        // The worker id is used since there may be multiple workers on a single host.
        args.add(BaseParameters.ID_FLAG);
        args.add(worker.getAddress().getHost() + "-" + worker.getId());
        result.add(new Pair<>(worker, args));
      }
      return result;
    }
  
    private Map<String, Object> getUfsConf(String ufsUri, RunTaskContext runTaskContext)
        throws Exception {
      Map<String, MountPointInfo> mountTable = runTaskContext.getFileSystem().getMountTable();
      for (Map.Entry<String, MountPointInfo> entry : mountTable.entrySet()) {
        if (ufsUri.startsWith(entry.getValue().getUfsUri())) {
          try (CloseableResource<UnderFileSystem> resource = runTaskContext.getUfsManager()
              .get(entry.getValue().getMountId()).acquireUfsResource()) {
            AlluxioConfiguration configuration = resource.get().getConfiguration();
            if (configuration instanceof UnderFileSystemConfiguration) {
              return ((UnderFileSystemConfiguration) configuration).getMountSpecificConf();
            }
          }
        }
      }
      return ImmutableMap.of();
    }
  
    @Override
    public String runTask(StressBenchConfig config, ArrayList<String> args,
        RunTaskContext runTaskContext) throws Exception {
      List<String> command = new ArrayList<>(3 + config.getArgs().size());
      command.add(Configuration.get(PropertyKey.HOME) + "/bin/alluxio");
      command.add("runClass");
      command.add(config.getClassName());
  
      // the cluster will run distributed tasks
      command.add(BaseParameters.DISTRIBUTED_FLAG);
      command.add(BaseParameters.IN_PROCESS_FLAG);
  
      List<String> commandArgs = config.getArgs();
      List<String> newArgs = new ArrayList<>();
      if (commandArgs.stream().anyMatch(
          (s) -> s.equals(UfsIOParameters.USE_MOUNT_CONF))) {
        boolean nextElem = false;
        boolean removeNext = false;
        String ufsUri = "";
        for (String elem : commandArgs) {
          if (elem.equals(UfsIOParameters.CONF)) {
            removeNext = true;
          } else {
            if (!removeNext) {
              newArgs.add(elem);
            }
            removeNext = false;
          }
          if (elem.equals(UfsIOParameters.PATH)) {
            nextElem = true;
          } else {
            if (nextElem) {
              ufsUri = elem;
              break;
            }
            nextElem = false;
          }
        }
        commandArgs = newArgs;
  
        List<String> properties = getUfsConf(ufsUri, runTaskContext).entrySet().stream()
            .map(entry -> "--conf" + entry.getKey() + "=" + entry.getValue())
            .collect(Collectors.toList());
        commandArgs.addAll(properties);
      }
  
      if (config.getArgs().stream().noneMatch((s) -> s.equals(BaseParameters.START_MS_FLAG))) {
        command.add(BaseParameters.START_MS_FLAG);
        command.add(Long.toString((System.currentTimeMillis() + config.getStartDelayMs())));
      }
  
      command.addAll(commandArgs);
      command.addAll(args);
      return ShellUtils.execCommand(command.toArray(new String[0]));
    }
  
    @Override
    public String join(StressBenchConfig config, Map<WorkerInfo, String> taskResults)
        throws Exception {
      if (taskResults.isEmpty()) {
        throw new IOException("No results from any workers.");
      }
  
      AtomicReference<IOException> error = new AtomicReference<>(null);
  
      List<TaskResult> results = taskResults.entrySet().stream().map(
          entry -> {
            try {
              String result = SerializationUtils.parseBenchmarkResult(entry.getValue().trim());
              return JsonSerializable.fromJson(result, new TaskResult[0]);
            } catch (IOException | ClassNotFoundException e) {
              // add log here because the exception details are lost at the client side
              LOG.warn("Failed to parse result into class {}", TaskResult.class, e);
              error.set(new IOException(
                  String.format("Failed to parse task output from %s into result class %s: %s",
                      entry.getKey().getAddress().getHost(), TaskResult.class,
                      entry.getValue().trim()),
                  e));
            }
            return null;
          }).collect(Collectors.toList());
  
      if (error.get() != null) {
        throw error.get();
      }
  
      return results.get(0).aggregator().aggregate(results).toJson();
    }
  }
  