io.druid.indexing.common.actions.TaskActionToolbox.java Source code

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Here is the source code for io.druid.indexing.common.actions.TaskActionToolbox.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.common.actions;

import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Inject;
import com.metamx.common.ISE;
import com.metamx.emitter.service.ServiceEmitter;
import io.druid.indexing.common.TaskLock;
import io.druid.indexing.common.task.Task;
import io.druid.indexing.overlord.IndexerMetadataStorageCoordinator;
import io.druid.indexing.overlord.TaskLockbox;
import io.druid.timeline.DataSegment;

import java.util.List;
import java.util.Set;

public class TaskActionToolbox {
    private final TaskLockbox taskLockbox;
    private final IndexerMetadataStorageCoordinator indexerMetadataStorageCoordinator;
    private final ServiceEmitter emitter;

    @Inject
    public TaskActionToolbox(TaskLockbox taskLockbox,
            IndexerMetadataStorageCoordinator indexerMetadataStorageCoordinator, ServiceEmitter emitter) {
        this.taskLockbox = taskLockbox;
        this.indexerMetadataStorageCoordinator = indexerMetadataStorageCoordinator;
        this.emitter = emitter;
    }

    public TaskLockbox getTaskLockbox() {
        return taskLockbox;
    }

    public IndexerMetadataStorageCoordinator getIndexerMetadataStorageCoordinator() {
        return indexerMetadataStorageCoordinator;
    }

    public ServiceEmitter getEmitter() {
        return emitter;
    }

    public boolean segmentsAreFromSamePartitionSet(final Set<DataSegment> segments) {
        // Verify that these segments are all in the same partition set

        Preconditions.checkArgument(!segments.isEmpty(), "segments nonempty");
        final DataSegment firstSegment = segments.iterator().next();
        for (final DataSegment segment : segments) {
            if (!segment.getDataSource().equals(firstSegment.getDataSource())
                    || !segment.getInterval().equals(firstSegment.getInterval())
                    || !segment.getVersion().equals(firstSegment.getVersion())) {
                return false;
            }
        }
        return true;
    }

    public void verifyTaskLocks(final Task task, final Set<DataSegment> segments) {
        if (!taskLockCoversSegments(task, segments)) {
            throw new ISE("Segments not covered by locks for task: %s", task.getId());
        }
    }

    public boolean taskLockCoversSegments(final Task task, final Set<DataSegment> segments) {
        // Verify that each of these segments falls under some lock

        // NOTE: It is possible for our lock to be revoked (if the task has failed and given up its locks) after we check
        // NOTE: it and before we perform the segment insert, but, that should be OK since the worst that happens is we
        // NOTE: insert some segments from the task but not others.

        final List<TaskLock> taskLocks = getTaskLockbox().findLocksForTask(task);
        for (final DataSegment segment : segments) {
            final boolean ok = Iterables.any(taskLocks, new Predicate<TaskLock>() {
                @Override
                public boolean apply(TaskLock taskLock) {
                    return taskLock.getDataSource().equals(segment.getDataSource())
                            && taskLock.getInterval().contains(segment.getInterval())
                            && taskLock.getVersion().compareTo(segment.getVersion()) >= 0;
                }
            });

            if (!ok) {
                return false;
            }
        }

        return true;
    }
}