org.apache.aurora.scheduler.async.preemptor.LiveClusterState.java Source code

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Here is the source code for org.apache.aurora.scheduler.async.preemptor.LiveClusterState.java

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/**
 * 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 org.apache.aurora.scheduler.async.preemptor;

import java.util.EnumSet;

import javax.inject.Inject;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Multimap;
import com.google.common.collect.Sets;

import org.apache.aurora.scheduler.base.Query;
import org.apache.aurora.scheduler.base.Tasks;
import org.apache.aurora.scheduler.storage.Storage;
import org.apache.aurora.scheduler.storage.entities.IAssignedTask;

import static java.util.Objects.requireNonNull;

import static org.apache.aurora.gen.ScheduleStatus.PREEMPTING;
import static org.apache.aurora.scheduler.base.Tasks.SCHEDULED_TO_ASSIGNED;

class LiveClusterState implements ClusterState {

    @VisibleForTesting
    static final Query.Builder CANDIDATE_QUERY = Query
            .statusScoped(EnumSet.copyOf(Sets.difference(Tasks.SLAVE_ASSIGNED_STATES, EnumSet.of(PREEMPTING))));

    private final Storage storage;

    @Inject
    LiveClusterState(Storage storage) {
        this.storage = requireNonNull(storage);
    }

    @Override
    public Multimap<String, PreemptionVictim> getSlavesToActiveTasks() {
        // Only non-pending active tasks may be preempted.
        Iterable<IAssignedTask> activeTasks = Iterables.transform(Storage.Util.fetchTasks(storage, CANDIDATE_QUERY),
                SCHEDULED_TO_ASSIGNED);

        // Group the tasks by slave id so they can be paired with offers from the same slave.
        // Choosing to do this iteratively instead of using Multimaps.index/transform to avoid
        // generating a very large intermediate map.
        ImmutableMultimap.Builder<String, PreemptionVictim> tasksBySlave = ImmutableMultimap.builder();
        for (IAssignedTask task : activeTasks) {
            tasksBySlave.put(task.getSlaveId(), PreemptionVictim.fromTask(task));
        }
        return tasksBySlave.build();
    }
}