com.metamx.druid.merger.common.task.IndexTask.java Source code

Introduction

Here is the source code for com.metamx.druid.merger.common.task.IndexTask.java

Source

/*
 * Druid - a distributed column store.
 * Copyright (C) 2012  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package com.metamx.druid.merger.common.task;

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.metamx.common.logger.Logger;
import com.metamx.druid.QueryGranularity;
import com.metamx.druid.aggregation.AggregatorFactory;
import com.metamx.druid.indexer.granularity.GranularitySpec;
import com.metamx.druid.merger.common.TaskStatus;
import com.metamx.druid.merger.common.TaskToolbox;
import com.metamx.druid.merger.coordinator.TaskContext;
import com.metamx.druid.realtime.FirehoseFactory;
import com.metamx.druid.realtime.Schema;
import com.metamx.druid.shard.NoneShardSpec;
import org.codehaus.jackson.annotate.JsonCreator;
import org.codehaus.jackson.annotate.JsonProperty;
import org.joda.time.DateTime;
import org.joda.time.Interval;

import java.util.List;

public class IndexTask extends AbstractTask {
    @JsonProperty
    private final GranularitySpec granularitySpec;
    @JsonProperty
    private final AggregatorFactory[] aggregators;
    @JsonProperty
    private final QueryGranularity indexGranularity;
    @JsonProperty
    private final long targetPartitionSize;
    @JsonProperty
    private final FirehoseFactory firehoseFactory;

    private static final Logger log = new Logger(IndexTask.class);

    @JsonCreator
    public IndexTask(@JsonProperty("dataSource") String dataSource,
            @JsonProperty("granularitySpec") GranularitySpec granularitySpec,
            @JsonProperty("aggregators") AggregatorFactory[] aggregators,
            @JsonProperty("indexGranularity") QueryGranularity indexGranularity,
            @JsonProperty("targetPartitionSize") long targetPartitionSize,
            @JsonProperty("firehose") FirehoseFactory firehoseFactory) {
        super(
                // _not_ the version, just something uniqueish
                String.format("index_%s_%s", dataSource, new DateTime().toString()), dataSource,
                new Interval(granularitySpec.bucketIntervals().first().getStart(),
                        granularitySpec.bucketIntervals().last().getEnd()));

        this.granularitySpec = Preconditions.checkNotNull(granularitySpec, "granularitySpec");
        this.aggregators = aggregators;
        this.indexGranularity = indexGranularity;
        this.targetPartitionSize = targetPartitionSize;
        this.firehoseFactory = firehoseFactory;
    }

    public List<Task> toSubtasks() {
        final List<Task> retVal = Lists.newArrayList();

        for (final Interval interval : granularitySpec.bucketIntervals()) {
            if (targetPartitionSize > 0) {
                // Need to do one pass over the data before indexing in order to determine good partitions
                retVal.add(new IndexDeterminePartitionsTask(getGroupId(), interval, firehoseFactory,
                        new Schema(getDataSource(), aggregators, indexGranularity, new NoneShardSpec()),
                        targetPartitionSize));
            } else {
                // Jump straight into indexing
                retVal.add(new IndexGeneratorTask(getGroupId(), interval, firehoseFactory,
                        new Schema(getDataSource(), aggregators, indexGranularity, new NoneShardSpec())));
            }
        }

        return retVal;
    }

    @Override
    public Type getType() {
        return Type.INDEX;
    }

    @Override
    public TaskStatus preflight(TaskContext context) throws Exception {
        return TaskStatus.continued(getId(), toSubtasks());
    }

    @Override
    public TaskStatus run(TaskContext context, TaskToolbox toolbox) throws Exception {
        throw new IllegalStateException("IndexTasks should not be run!");
    }
}