adarshsanjeev commented on code in PR #13205: URL: https://github.com/apache/druid/pull/13205#discussion_r1022519900
########## extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/WorkerSketchFetcher.java: ########## @@ -0,0 +1,253 @@ +/* + * 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. + */ + +package org.apache.druid.msq.exec; + +import org.apache.druid.frame.key.ClusterBy; +import org.apache.druid.frame.key.ClusterByPartition; +import org.apache.druid.frame.key.ClusterByPartitions; +import org.apache.druid.java.util.common.Either; +import org.apache.druid.msq.kernel.StageDefinition; +import org.apache.druid.msq.statistics.ClusterByStatisticsCollector; +import org.apache.druid.msq.statistics.ClusterByStatisticsSnapshot; +import org.apache.druid.msq.statistics.WorkerAggregatedKeyStatistics; + +import java.util.ArrayList; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; + +/** + * Queues up fetching sketches from workers and progressively generates partitions boundaries. + */ +public class WorkerSketchFetcher +{ + private static final int DEFAULT_THREAD_COUNT = 10; + private static final long BYTES_THRESHOLD = 1_000_000_000L; + private static final long WORKER_THRESHOLD = 100; + + private final ClusterStatisticsMergeMode clusterStatisticsMergeMode; + private final WorkerClient workerClient; + private final ExecutorService executorService; + + public WorkerSketchFetcher(WorkerClient workerClient, ClusterStatisticsMergeMode clusterStatisticsMergeMode) + { + this.workerClient = workerClient; + this.clusterStatisticsMergeMode = clusterStatisticsMergeMode; + this.executorService = Executors.newFixedThreadPool(DEFAULT_THREAD_COUNT); + } + + /** + * Submits a request to fetch and generate partitions for the given worker statistics and returns a future for it. It + * decides based on the statistics if it should fetch sketches one by one or together. + */ + public CompletableFuture<Either<Long, ClusterByPartitions>> submitFetcherTask( + WorkerAggregatedKeyStatistics aggregatedKeyStatistics, + List<String> workerTaskIds, + StageDefinition stageDefinition + ) + { + ClusterBy clusterBy = stageDefinition.getClusterBy(); + + switch (clusterStatisticsMergeMode) { + case SEQUENTIAL: + return sequentialTimeChunkMerging(aggregatedKeyStatistics, stageDefinition, workerTaskIds); + case PARALLEL: + return inMemoryFullSketchMerging(stageDefinition, workerTaskIds); + case AUTO: + if (clusterBy.getBucketByCount() == 0) { Review Comment: This case happens when clusterBy is none(), for partitioning by all time https://github.com/apache/druid/blob/master/processing/src/main/java/org/apache/druid/frame/key/ClusterBy.java#L66 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
