jtao15 commented on a change in pull request #7178: URL: https://github.com/apache/pinot/pull/7178#discussion_r682319568
########## File path: pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/merge_rollup/MergeRollupTaskGenerator.java ########## @@ -0,0 +1,450 @@ +/** + * 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.pinot.plugin.minion.tasks.merge_rollup; + +import com.google.common.base.Preconditions; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Comparator; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.TreeMap; +import java.util.TreeSet; +import java.util.stream.Collectors; +import org.apache.commons.lang3.StringUtils; +import org.apache.helix.task.TaskState; +import org.apache.pinot.common.lineage.SegmentLineage; +import org.apache.pinot.common.lineage.SegmentLineageUtils; +import org.apache.pinot.common.metadata.segment.OfflineSegmentZKMetadata; +import org.apache.pinot.common.metadata.segment.SegmentZKMetadata; +import org.apache.pinot.common.minion.MergeRollupTaskMetadata; +import org.apache.pinot.controller.helix.core.minion.ClusterInfoAccessor; +import org.apache.pinot.controller.helix.core.minion.generator.PinotTaskGenerator; +import org.apache.pinot.controller.helix.core.minion.generator.TaskGeneratorUtils; +import org.apache.pinot.core.common.MinionConstants; +import org.apache.pinot.core.common.MinionConstants.MergeRollupTask; +import org.apache.pinot.core.minion.PinotTaskConfig; +import org.apache.pinot.spi.annotations.minion.TaskGenerator; +import org.apache.pinot.spi.config.table.ColumnPartitionConfig; +import org.apache.pinot.spi.config.table.SegmentPartitionConfig; +import org.apache.pinot.spi.config.table.TableConfig; +import org.apache.pinot.spi.config.table.TableTaskConfig; +import org.apache.pinot.spi.config.table.TableType; +import org.apache.pinot.spi.config.table.ingestion.IngestionConfig; +import org.apache.pinot.spi.utils.TimeUtils; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * A {@link PinotTaskGenerator} implementation for generating tasks of type {@link MergeRollupTask} + * + * TODO: Add the support for realtime table + * + * Steps: + * + * - Pre-select segments: + * - Fetch all segments, select segments based on segment lineage (removing segmentsFrom for COMPLETED lineage entry and + * segmentsTo for IN_PROGRESS lineage entry) + * - Filter out segments already scheduled by checking zk minion task configs + * - Sort segments based on startTime and endTime in ascending order + * + * For each mergeLevel (from lowest to highest, e.g. Hourly -> Daily -> Monthly -> Yearly): + * - Calculate merge/rollup window: + * - Read watermarkMs from the {@link MergeRollupTaskMetadata} ZNode + * found at MINION_TASK_METADATA/MergeRollupTaskMetadata/tableNameWithType + * In case of cold-start, no ZNode will exist. + * A new ZNode will be created, with watermarkMs as the smallest time found in all segments truncated to the + * closest bucket start time. + * - The execution window for the task is calculated as, + * windowStartMs = watermarkMs, windowEndMs = windowStartMs + bucketTimeMs + * - Skip scheduling if the window is invalid: + * - If the execution window is not older than bufferTimeMs, no task will be generated + * - The windowEndMs for higher granularity should be less or equal than the waterMarkMs for lower granularity + * - Bump up target window and watermark if needed. + * - If there's no unmerged segments (by checking egment zk metadata {mergeRollupTask.mergeLevel: level}) for current window, + * keep bumping up the watermark and target window until unmerged segments are found. Else skip the scheduling. + * - Select all segments for the target window + * - Create tasks (per partition for partitioned table) based on maxNumRecordsPerTask + */ +@TaskGenerator +public class MergeRollupTaskGenerator implements PinotTaskGenerator { + private static final int DEFAULT_MAX_NUM_RECORDS_PER_TASK = 50_000_000; + private static final Logger LOGGER = LoggerFactory.getLogger(MergeRollupTaskGenerator.class); + + private ClusterInfoAccessor _clusterInfoAccessor; + + @Override + public void init(ClusterInfoAccessor clusterInfoAccessor) { + _clusterInfoAccessor = clusterInfoAccessor; + } + + @Override + public String getTaskType() { + return MergeRollupTask.TASK_TYPE; + } + + @Override + public List<PinotTaskConfig> generateTasks(List<TableConfig> tableConfigs) { + String taskType = MergeRollupTask.TASK_TYPE; + List<PinotTaskConfig> pinotTaskConfigs = new ArrayList<>(); + + for (TableConfig tableConfig : tableConfigs) { + String offlineTableName = tableConfig.getTableName(); + + if (tableConfig.getTableType() != TableType.OFFLINE) { + LOGGER.warn("Skip generating task: {} for non-OFFLINE table: {}, REALTIME table is not supported yet", taskType, + offlineTableName); + continue; + } + + IngestionConfig ingestionConfig = tableConfig.getIngestionConfig(); + if (ingestionConfig != null && ingestionConfig.getBatchIngestionConfig() != null && "REFRESH".equalsIgnoreCase( + ingestionConfig.getBatchIngestionConfig().getSegmentIngestionType())) { + LOGGER.warn("Skip generating task: {} for non-APPEND table: {}, REFRESH table is not supported", taskType, + offlineTableName); + continue; + } + + LOGGER.info("Start generating task configs for table: {} for task: {}", offlineTableName, taskType); + + TableTaskConfig tableTaskConfig = tableConfig.getTaskConfig(); + Preconditions.checkState(tableTaskConfig != null); + Map<String, String> taskConfigs = tableTaskConfig.getConfigsForTaskType(taskType); + Preconditions.checkState(taskConfigs != null, "Task config shouldn't be null for table: {}", offlineTableName); + + // Get all segment metadata + Set<OfflineSegmentZKMetadata> allSegmentsForOfflineTable = + new HashSet<>(_clusterInfoAccessor.getOfflineSegmentsMetadata(offlineTableName)); + + // Select current segment snapshot based on lineage + SegmentLineage segmentLineageForTable = _clusterInfoAccessor.getSegmentLineage(offlineTableName); + Set<String> selectedSegmentsBasedOnLineage = SegmentLineageUtils.filterSegmentsBasedOnLineage( + allSegmentsForOfflineTable.stream().map(SegmentZKMetadata::getSegmentName).collect(Collectors.toSet()), + segmentLineageForTable); + + // Filter out segments that are already scheduled + Map<String, List<PinotTaskConfig>> inCompleteMergeLevelToTaskConfig = new HashMap<>(); + Set<String> segmentsScheduled = new HashSet<>(); + for (Map.Entry<String, TaskState> entry : TaskGeneratorUtils.getIncompleteTasks(taskType, offlineTableName, + _clusterInfoAccessor).entrySet()) { + for (PinotTaskConfig taskConfig : _clusterInfoAccessor.getTaskConfigs(entry.getKey())) { + inCompleteMergeLevelToTaskConfig.computeIfAbsent(taskConfig.getConfigs().get(MergeRollupTask.MERGE_LEVEL_KEY), + k -> new ArrayList<>()).add(taskConfig); + segmentsScheduled.addAll(Arrays.asList(taskConfig.getConfigs() + .get(MinionConstants.SEGMENT_NAME_KEY) + .split(MinionConstants.SEGMENT_NAME_SEPARATOR))); + } + } + + // Sort segments based on startTimeMs and endTimeMs in ascending order + TreeSet<OfflineSegmentZKMetadata> preSelectedSegmentsForOfflineTable = allSegmentsForOfflineTable.stream() + .filter(m -> selectedSegmentsBasedOnLineage.contains(m.getSegmentName()) && !segmentsScheduled.contains( + m.getSegmentName())) + .collect(Collectors.toCollection(() -> new TreeSet<>((a, b) -> { + long aStartTime = a.getStartTimeMs(); + long bStartTime = b.getStartTimeMs(); + return aStartTime != bStartTime ? Long.compare(aStartTime, bStartTime) + : Long.compare(a.getEndTimeMs(), b.getEndTimeMs()); + }))); + + if (preSelectedSegmentsForOfflineTable.isEmpty()) { + LOGGER.warn("Skip generating task: {} for table: {}, no segment is found to merge.", taskType, + offlineTableName); + continue; + } + + // Sort merge levels based on bucket time period + Map<String, Map<String, String>> mergeLevelToConfigs = MergeRollupTaskUtils.getLevelToConfigMap(taskConfigs); + List<Map.Entry<String, Map<String, String>>> sortedMergeLevelConfigs = mergeLevelToConfigs.entrySet() + .stream() + .sorted(Comparator.comparingLong( + e -> TimeUtils.convertPeriodToMillis(e.getValue().get(MinionConstants.MergeTask.BUCKET_TIME_PERIOD_KEY)))) + .collect(Collectors.toList()); + + // Schedule tasks from lowest to highest merge level + String lowerMergeLevel = null; + long lowerMergeLevelWatermarkMs = -1; + + for (Map.Entry<String, Map<String, String>> entry : sortedMergeLevelConfigs) { + String mergeLevel = entry.getKey(); + Map<String, String> mergeConfig = entry.getValue(); + + // Get the bucket size and buffer + long bucketMs = + TimeUtils.convertPeriodToMillis(mergeConfig.get(MinionConstants.MergeTask.BUCKET_TIME_PERIOD_KEY)); + long bufferMs = + TimeUtils.convertPeriodToMillis(mergeConfig.get(MinionConstants.MergeTask.BUFFER_TIME_PERIOD_KEY)); + + // Get watermark from MergeRollupTaskMetadata ZNode. + // windowStartMs = watermarkMs, windowEndMs = windowStartMs + bucketTimeMs + long waterMarkMs = + getWatermarkMs(offlineTableName, preSelectedSegmentsForOfflineTable.first().getStartTimeMs(), bucketMs, + mergeLevel); + long windowStartMs = waterMarkMs; + long windowEndMs = windowStartMs + bucketMs; + + // Skip scheduling if there's incomplete task for current mergeLevel + if (inCompleteMergeLevelToTaskConfig.containsKey(mergeLevel)) { + LOGGER.info( + "Found incomplete tasks: {} of merge level: {} for the same table: {}, Skipping task generation: {}", + inCompleteMergeLevelToTaskConfig.get(mergeLevel), mergeLevel, offlineTableName, taskType); + lowerMergeLevel = mergeLevel; + lowerMergeLevelWatermarkMs = waterMarkMs; + continue; + } + + if (!isValidMergeWindowEndTime(windowEndMs, bufferMs, lowerMergeLevel, lowerMergeLevelWatermarkMs)) { + LOGGER.warn( + "Window with start: {} and end: {} of mergeLevel: {} is not a valid merge window, Skipping task generation: {}", + windowStartMs, windowEndMs, mergeLevel, taskType); + lowerMergeLevel = mergeLevel; + lowerMergeLevelWatermarkMs = waterMarkMs; + continue; + } + + // Find all segments overlapping with the merge window, if all overlapping segments are merged, bump up the target window + List<OfflineSegmentZKMetadata> selectedSegments = new ArrayList<>(); + boolean hasUnMergedSegments = false; + boolean isValidMergeWindow = true; + + for (OfflineSegmentZKMetadata preSelectedSegment : preSelectedSegmentsForOfflineTable) { + if (windowStartMs <= preSelectedSegment.getEndTimeMs() && preSelectedSegment.getStartTimeMs() < windowEndMs) { + // For segments overlapping with current window, add to the result list + selectedSegments.add(preSelectedSegment); + if (!isMergedSegment(preSelectedSegment, mergeLevel)) { + hasUnMergedSegments = true; + } + } else if (windowEndMs <= preSelectedSegment.getStartTimeMs()) { + // Has gone through all overlapping segments for current window + if (hasUnMergedSegments) { + // Found unmerged segments, schedule merge task for current window + break; + } else { + // No unmerged segments found, clean up selected segments and bump up the merge window + selectedSegments = new ArrayList<>(); + selectedSegments.add(preSelectedSegment); + if (!isMergedSegment(preSelectedSegment, mergeLevel)) { + hasUnMergedSegments = true; + } + while (windowEndMs <= preSelectedSegment.getStartTimeMs()) { + LOGGER.debug("No unmerged segments found for window [{}, {}), Update window to: [{}. {})", + windowStartMs, windowEndMs, windowStartMs + bucketMs, windowEndMs + bucketMs); + windowStartMs += bucketMs; + windowEndMs += bucketMs; + if (!isValidMergeWindowEndTime(windowEndMs, bufferMs, lowerMergeLevel, lowerMergeLevelWatermarkMs)) { + isValidMergeWindow = false; + break; + } + } + + if (!isValidMergeWindow) { + break; + } + } + } + // windowStartMs > preSelectedSegment.getEndTimeMs() + // Haven't find the first overlapping segment, continue to the next segment + } + + if (windowStartMs != waterMarkMs) { + updateWatermarkMs(offlineTableName, mergeLevel, windowStartMs); + } + lowerMergeLevel = mergeLevel; + lowerMergeLevelWatermarkMs = windowStartMs; + + if (!isValidMergeWindow) { + LOGGER.warn( + "Window with start: {} and end: {} of mergeLevel: {} is not a valid merge window, Skipping task generation: {}", + windowStartMs, windowEndMs, mergeLevel, taskType); + continue; + } + + if (!hasUnMergedSegments && !selectedSegments.isEmpty()) { + // If current merge window overlaps with all the newest pre-selected segments, and these segments are all merged, + // we don't have a chance to bump up the watermark in previous for loop, handle the case here. + LOGGER.debug("No unmerged segments found for window [{}, {}), Update window to: [{}. {})", windowStartMs, + windowEndMs, windowStartMs + bucketMs, windowEndMs + bucketMs); + windowStartMs += bucketMs; + updateWatermarkMs(offlineTableName, mergeLevel, windowStartMs); + } + + if (!hasUnMergedSegments) { + LOGGER.info("No unmerged segments found for mergeLevel:{} for table: {}, Skipping task generation: {}", + mergeLevel, offlineTableName, taskType); + continue; + } + + // Create task configs + SegmentPartitionConfig segmentPartitionConfig = tableConfig.getIndexingConfig().getSegmentPartitionConfig(); + if (segmentPartitionConfig == null) { + pinotTaskConfigs.addAll(createPinotTaskConfigs(selectedSegments, offlineTableName, taskConfigs, mergeConfig)); + } else { + // For partitioned table, schedule separate tasks for each partition + Map<String, ColumnPartitionConfig> columnPartitionMap = segmentPartitionConfig.getColumnPartitionMap(); + Preconditions.checkState(columnPartitionMap.size() == 1, "Cannot partition on multiple columns for table: %s", + tableConfig.getTableName()); + Map.Entry<String, ColumnPartitionConfig> partitionEntry = columnPartitionMap.entrySet().iterator().next(); + String partitionColumn = partitionEntry.getKey(); + + Map<Integer, List<OfflineSegmentZKMetadata>> partitionToSegments = new HashMap<>(); + for (OfflineSegmentZKMetadata selectedSegment : selectedSegments) { + Set<Integer> partitions = selectedSegment.getPartitionMetadata().getPartitions(partitionColumn); + Preconditions.checkState(partitions.size() == 1, Review comment: Added outlier list to handle this case. -- This is an automated message from the Apache Git Service. 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