io.druid.indexing.overlord.setup.EqualDistributionWorkerSelectStrategy.java Source code

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Here is the source code for io.druid.indexing.overlord.setup.EqualDistributionWorkerSelectStrategy.java

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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<ImmutableZkWorker> findWorkerForTask(RemoteTaskRunnerConfig config,
            ImmutableMap<String, ImmutableZkWorker> zkWorkers, Task task) {
        final TreeSet<ImmutableZkWorker> sortedWorkers = Sets.newTreeSet(new Comparator<ImmutableZkWorker>() {
            @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();
    }
}