io.druid.indexing.overlord.ZkWorker Maven / Gradle / Ivy

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group 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 io.druid.indexing.overlord;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import io.druid.indexing.worker.TaskAnnouncement;
import io.druid.indexing.worker.Worker;
import org.apache.curator.framework.recipes.cache.ChildData;
import org.apache.curator.framework.recipes.cache.PathChildrenCache;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;
import org.joda.time.DateTime;

import java.io.Closeable;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

/**
 * Holds information about a worker and a listener for task status changes associated with the worker.
 */
public class ZkWorker implements Closeable
{
  private final PathChildrenCache statusCache;
  private final Function cacheConverter;

  private AtomicReference worker;
  private AtomicReference lastCompletedTaskTime = new AtomicReference(new DateTime());

  public ZkWorker(Worker worker, PathChildrenCache statusCache, final ObjectMapper jsonMapper)
  {
    this.worker = new AtomicReference<>(worker);
    this.statusCache = statusCache;
    this.cacheConverter = new Function()
    {
      @Override
      public TaskAnnouncement apply(ChildData input)
      {
        try {
          return jsonMapper.readValue(input.getData(), TaskAnnouncement.class);
        }
        catch (Exception e) {
          throw Throwables.propagate(e);
        }
      }
    };
  }

  public void start() throws Exception
  {
    statusCache.start(PathChildrenCache.StartMode.POST_INITIALIZED_EVENT);
  }

  public void addListener(PathChildrenCacheListener listener)
  {
    statusCache.getListenable().addListener(listener);
  }

  @JsonProperty("worker")
  public Worker getWorker()
  {
    return worker.get();
  }

  @JsonProperty("runningTasks")
  public Collection getRunningTaskIds()
  {
    return getRunningTasks().keySet();
  }

  public Map getRunningTasks()
  {
    Map retVal = Maps.newHashMap();
    for (TaskAnnouncement taskAnnouncement : Lists.transform(
        statusCache.getCurrentData(),
        cacheConverter
    )) {
      retVal.put(taskAnnouncement.getTaskStatus().getId(), taskAnnouncement);
    }

    return retVal;
  }

  @JsonProperty("currCapacityUsed")
  public int getCurrCapacityUsed()
  {
    int currCapacity = 0;
    for (TaskAnnouncement taskAnnouncement : getRunningTasks().values()) {
      currCapacity += taskAnnouncement.getTaskResource().getRequiredCapacity();
    }
    return currCapacity;
  }

  @JsonProperty("availabilityGroups")
  public Set getAvailabilityGroups()
  {
    Set retVal = Sets.newHashSet();
    for (TaskAnnouncement taskAnnouncement : getRunningTasks().values()) {
      retVal.add(taskAnnouncement.getTaskResource().getAvailabilityGroup());
    }
    return retVal;
  }

  @JsonProperty
  public DateTime getLastCompletedTaskTime()
  {
    return lastCompletedTaskTime.get();
  }

  public boolean isRunningTask(String taskId)
  {
    return getRunningTasks().containsKey(taskId);
  }

  public boolean isValidVersion(String minVersion)
  {
    return worker.get().getVersion().compareTo(minVersion) >= 0;
  }

  public void setWorker(Worker newWorker)
  {
    final Worker oldWorker = worker.get();
    Preconditions.checkArgument(newWorker.getHost().equals(oldWorker.getHost()), "Cannot change Worker host");
    Preconditions.checkArgument(newWorker.getIp().equals(oldWorker.getIp()), "Cannot change Worker ip");

    worker.set(newWorker);
  }

  public void setLastCompletedTaskTime(DateTime completedTaskTime)
  {
    lastCompletedTaskTime.set(completedTaskTime);
  }

  public ImmutableZkWorker toImmutable()
  {
    return new ImmutableZkWorker(worker.get(), getCurrCapacityUsed(), getAvailabilityGroups());
  }

  @Override
  public void close() throws IOException
  {
    statusCache.close();
  }

  @Override
  public String toString()
  {
    return "ZkWorker{" +
           "worker=" + worker +
           ", lastCompletedTaskTime=" + lastCompletedTaskTime +
           '}';
  }
}