DistributedWorkerProgramRunner.java

/*
 * Copyright © 2015 Cask Data, Inc.
 *
 * Licensed 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 co.cask.cdap.internal.app.runtime.distributed;

import co.cask.cdap.api.Resources;
import co.cask.cdap.api.app.ApplicationSpecification;
import co.cask.cdap.api.worker.WorkerSpecification;
import co.cask.cdap.app.program.Program;
import co.cask.cdap.app.runtime.ProgramController;
import co.cask.cdap.app.runtime.ProgramOptions;
import co.cask.cdap.common.app.RunIds;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.conf.Constants;
import co.cask.cdap.common.twill.AbortOnTimeoutEventHandler;
import co.cask.cdap.internal.app.runtime.ProgramOptionConstants;
import co.cask.cdap.proto.ProgramType;
import co.cask.cdap.security.TokenSecureStoreUpdater;
import com.google.common.base.Preconditions;
import com.google.gson.Gson;
import com.google.inject.Inject;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.twill.api.EventHandler;
import org.apache.twill.api.RunId;
import org.apache.twill.api.TwillController;
import org.apache.twill.api.TwillRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.util.Map;

/**
 * Distributed ProgramRunner for Worker.
 */
public class DistributedWorkerProgramRunner extends AbstractDistributedProgramRunner {

  private static final Logger LOG = LoggerFactory.getLogger(DistributedWorkerProgramRunner.class);
  private static final Gson GSON = new Gson();

  @Inject
  DistributedWorkerProgramRunner(TwillRunner twillRunner, YarnConfiguration hConf, CConfiguration cConf,
                                 TokenSecureStoreUpdater tokenSecureStoreUpdater) {
    super(twillRunner, hConf, cConf, tokenSecureStoreUpdater);
  }

  @Override
  protected ProgramController launch(Program program, ProgramOptions options,
                                     Map<String, LocalizeResource> localizeResources,
                                     File tempDir, ApplicationLauncher launcher) {
    ApplicationSpecification appSpec = program.getApplicationSpecification();
    Preconditions.checkNotNull(appSpec, "Missing application specification.");

    ProgramType processorType = program.getType();
    Preconditions.checkNotNull(processorType, "Missing processor type.");
    Preconditions.checkArgument(processorType == ProgramType.WORKER, "Only WORKER process type is supported.");

    WorkerSpecification workerSpec = appSpec.getWorkers().get(program.getName());
    Preconditions.checkNotNull(workerSpec, "Missing WorkerSpecification for %s", program.getName());

    String instances = options.getArguments().getOption(ProgramOptionConstants.INSTANCES,
                                                        String.valueOf(workerSpec.getInstances()));
    String resourceString = options.getArguments().getOption(ProgramOptionConstants.RESOURCES, null);
    Resources newResources = (resourceString != null) ? GSON.fromJson(resourceString, Resources.class) :
      workerSpec.getResources();

    WorkerSpecification newWorkerSpec = new WorkerSpecification(workerSpec.getClassName(), workerSpec.getName(),
                                                                workerSpec.getDescription(), workerSpec.getProperties(),
                                                                workerSpec.getDatasets(), newResources,
                                                                Integer.valueOf(instances));

    LOG.info("Launching distributed worker {}", program.getName());

    TwillController controller = launcher.launch(new WorkerTwillApplication(program, newWorkerSpec,
                                                                            localizeResources, eventHandler));
    RunId runId = RunIds.fromString(options.getArguments().getOption(ProgramOptionConstants.RUN_ID));
    return new WorkerTwillProgramController(program.getId(), controller, runId).startListen();
  }

  @Override
  protected EventHandler createEventHandler(CConfiguration cConf) {
    return new AbortOnTimeoutEventHandler(
      cConf.getLong(Constants.CFG_TWILL_NO_CONTAINER_TIMEOUT, Long.MAX_VALUE), true);
  }
}