io.druid.indexing.overlord.setup.EqualDistributionWorkerSelectStrategy 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.setup;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import com.google.common.primitives.Ints;
import io.druid.indexing.common.task.Task;
import io.druid.indexing.overlord.ImmutableZkWorker;
import io.druid.indexing.overlord.config.RemoteTaskRunnerConfig;

import java.util.Comparator;
import java.util.TreeSet;

/**
 */
public class EqualDistributionWorkerSelectStrategy implements WorkerSelectStrategy
{
  @Override
  public Optional findWorkerForTask(
      RemoteTaskRunnerConfig config, ImmutableMap zkWorkers, Task task
  )
  {
    final TreeSet sortedWorkers = Sets.newTreeSet(
        new Comparator()
        {
          @Override
          public int compare(
              ImmutableZkWorker zkWorker, ImmutableZkWorker zkWorker2
          )
          {
            return -Ints.compare(zkWorker2.getCurrCapacityUsed(), zkWorker.getCurrCapacityUsed());
          }
        }
    );
    sortedWorkers.addAll(zkWorkers.values());
    final String minWorkerVer = config.getMinWorkerVersion();

    for (ImmutableZkWorker zkWorker : sortedWorkers) {
      if (zkWorker.canRunTask(task) && zkWorker.isValidVersion(minWorkerVer)) {
        return Optional.of(zkWorker);
      }
    }

    return Optional.absent();
  }
}