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Automatically determine numShards for parallel ingestion hash partiti…
…oning (apache#10419) * Automatically determine numShards for parallel ingestion hash partitioning * Fix inspection, tests, coverage * Docs and some PR comments * Adjust locking * Use HllSketch instead of HyperLogLogCollector * Fix tests * Address some PR comments * Fix granularity bug * Small doc fix
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...java/org/apache/druid/indexing/common/task/batch/parallel/DimensionCardinalityReport.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
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| package org.apache.druid.indexing.common.task.batch.parallel; | ||
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| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
| import org.apache.datasketches.hll.HllSketch; | ||
| import org.joda.time.Interval; | ||
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| import java.util.Map; | ||
| import java.util.Objects; | ||
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| public class DimensionCardinalityReport implements SubTaskReport | ||
| { | ||
| // We choose logK=11 because the following link shows that HllSketch with K=2048 has roughly the same | ||
| // serialized size as HyperLogLogCollector. | ||
| // http://datasketches.apache.org/docs/HLL/HllSketchVsDruidHyperLogLogCollector.html | ||
| public static final int HLL_SKETCH_LOG_K = 11; | ||
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| static final String TYPE = "dimension_cardinality"; | ||
| private static final String PROP_CARDINALITIES = "cardinalities"; | ||
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| private final String taskId; | ||
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| /** | ||
| * A map of intervals to byte arrays, representing {@link HllSketch} objects, | ||
| * serialized using {@link HllSketch#toCompactByteArray()}. | ||
| * | ||
| * The HllSketch objects should be created with the HLL_SKETCH_LOG_K constant defined in this class. | ||
| * | ||
| * The collector is used to determine cardinality estimates for each interval. | ||
| */ | ||
| private final Map<Interval, byte[]> intervalToCardinalities; | ||
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| @JsonCreator | ||
| public DimensionCardinalityReport( | ||
| @JsonProperty("taskId") String taskId, | ||
| @JsonProperty(PROP_CARDINALITIES) Map<Interval, byte[]> intervalToCardinalities | ||
| ) | ||
| { | ||
| this.taskId = taskId; | ||
| this.intervalToCardinalities = intervalToCardinalities; | ||
| } | ||
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| @Override | ||
| @JsonProperty | ||
| public String getTaskId() | ||
| { | ||
| return taskId; | ||
| } | ||
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| @JsonProperty(PROP_CARDINALITIES) | ||
| public Map<Interval, byte[]> getIntervalToCardinalities() | ||
| { | ||
| return intervalToCardinalities; | ||
| } | ||
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| @Override | ||
| public String toString() | ||
| { | ||
| return "DimensionCardinalityReport{" + | ||
| "taskId='" + taskId + '\'' + | ||
| ", intervalToCardinalities=" + intervalToCardinalities + | ||
| '}'; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) | ||
| { | ||
| if (this == o) { | ||
| return true; | ||
| } | ||
| if (o == null || getClass() != o.getClass()) { | ||
| return false; | ||
| } | ||
| DimensionCardinalityReport that = (DimensionCardinalityReport) o; | ||
| return Objects.equals(getTaskId(), that.getTaskId()) && | ||
| Objects.equals(getIntervalToCardinalities(), that.getIntervalToCardinalities()); | ||
| } | ||
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| @Override | ||
| public int hashCode() | ||
| { | ||
| return Objects.hash(getTaskId(), getIntervalToCardinalities()); | ||
| } | ||
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| public static HllSketch createHllSketchForReport() | ||
| { | ||
| return new HllSketch(HLL_SKETCH_LOG_K); | ||
| } | ||
| } |
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