jtao15 commented on a change in pull request #7178: URL: https://github.com/apache/pinot/pull/7178#discussion_r685448810
########## 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 +1,491 @@ +/** + * 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.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 org.I0Itec.zkclient.exception.ZkException; +import org.apache.commons.lang3.StringUtils; +import org.apache.helix.ZNRecord; +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.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.utils.IngestionConfigUtils; +import org.apache.pinot.spi.utils.TimeUtils; +import org.apache.pinot.spi.utils.builder.TableNameBuilder; +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) + * - Sort segments based on startTime and endTime in ascending order + * + * For each mergeLevel (from lowest to highest, e.g. Hourly -> Daily -> Monthly -> Yearly): + * - Skip scheduling if there's incomplete task for the mergeLevel + * - Calculate merge/rollup window: + * - Read watermarkMs from the {@link MergeRollupTaskMetadata} ZNode + * found at MINION_TASK_METADATA/MergeRollupTask/<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 of higher merge level should be less or equal to the waterMarkMs of lower level + * - Bump up target window and watermark if needed. + * - If there's no unmerged segments (by checking segment 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 String REFRESH = "REFRESH"; + 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) { + if (!validate(tableConfig, taskType)) { + continue; + } + String offlineTableName = tableConfig.getTableName(); + LOGGER.info("Start generating task configs for table: {} for task: {}", offlineTableName, taskType); + + // Get all segment metadata + Set<OfflineSegmentZKMetadata> allSegments = + new HashSet<>(_clusterInfoAccessor.getOfflineSegmentsMetadata(offlineTableName)); + + // Select current segment snapshot based on lineage + SegmentLineage segmentLineage = _clusterInfoAccessor.getSegmentLineage(offlineTableName); + Set<String> preSelectedSegmentsBasedOnLineage = new HashSet<>(); + for (OfflineSegmentZKMetadata offlineSegmentZKMetadata : allSegments) { + preSelectedSegmentsBasedOnLineage.add(offlineSegmentZKMetadata.getSegmentName()); + } + SegmentLineageUtils.filterSegmentsBasedOnLineageInplace(preSelectedSegmentsBasedOnLineage, segmentLineage); + + // Sort segments based on startTimeMs, endTimeMs and segmentName in ascending order + TreeSet<OfflineSegmentZKMetadata> preSelectedSegments = new TreeSet<>((a, b) -> { + long aStartTime = a.getStartTimeMs(); + long bStartTime = b.getStartTimeMs(); + if (aStartTime != bStartTime) { + return Long.compare(aStartTime, bStartTime); + } + long aEndTime = a.getEndTimeMs(); + long bEndTime = b.getEndTimeMs(); + return aEndTime != bEndTime ? Long.compare(aEndTime, bEndTime) + : a.getSegmentName().compareTo(b.getSegmentName()); + }); + for (OfflineSegmentZKMetadata segment : allSegments) { + if (preSelectedSegmentsBasedOnLineage.contains(segment.getSegmentName())) { + preSelectedSegments.add(segment); + } + } + + if (preSelectedSegments.isEmpty()) { + LOGGER.info("Skip generating task: {} for table: {}, no segment is found to merge.", taskType, + offlineTableName); + continue; + } + + // Sort merge levels based on bucket time period + Map<String, String> taskConfigs = tableConfig.getTaskConfig().getConfigsForTaskType(taskType); + Map<String, Map<String, String>> mergeLevelToConfigs = MergeRollupTaskUtils.getLevelToConfigMap(taskConfigs); + List<Map.Entry<String, Map<String, String>>> sortedMergeLevelConfigs = + new ArrayList<>(mergeLevelToConfigs.entrySet()); + sortedMergeLevelConfigs.sort(Comparator.comparingLong( + e -> TimeUtils.convertPeriodToMillis(e.getValue().get(MinionConstants.MergeTask.BUCKET_TIME_PERIOD_KEY)))); + + // Get incomplete merge levels + Set<String> inCompleteMergeLevels = new HashSet<>(); + for (Map.Entry<String, TaskState> entry : TaskGeneratorUtils.getIncompleteTasks(taskType, offlineTableName, + _clusterInfoAccessor).entrySet()) { + for (PinotTaskConfig taskConfig : _clusterInfoAccessor.getTaskConfigs(entry.getKey())) { + inCompleteMergeLevels.add(taskConfig.getConfigs().get(MergeRollupTask.MERGE_LEVEL_KEY)); + } + } + + ZNRecord mergeRollupTaskZNRecord = _clusterInfoAccessor.getMinionMergeRollupTaskZNRecord(offlineTableName); + int expectedVersion = mergeRollupTaskZNRecord != null ? mergeRollupTaskZNRecord.getVersion() : -1; + MergeRollupTaskMetadata mergeRollupTaskMetadata = + mergeRollupTaskZNRecord != null ? MergeRollupTaskMetadata.fromZNRecord(mergeRollupTaskZNRecord) + : new MergeRollupTaskMetadata(offlineTableName, new TreeMap<>()); + List<PinotTaskConfig> pinotTaskConfigsForTable = new ArrayList<>(); + + // Schedule tasks from lowest to highest merge level (e.g. Hourly -> Daily -> Monthly -> Yearly) + for (int i = 0; i < sortedMergeLevelConfigs.size(); i++) { + String lowerMergeLevel = i > 0 ? sortedMergeLevelConfigs.get(i - 1).getKey() : null; + String mergeLevel = sortedMergeLevelConfigs.get(i).getKey(); + Map<String, String> mergeConfigs = sortedMergeLevelConfigs.get(i).getValue(); + + // Skip scheduling if there's incomplete task for current mergeLevel + if (inCompleteMergeLevels.contains(mergeLevel)) { + LOGGER.info("Found incomplete task of merge level: {} for the same table: {}, Skipping task generation: {}", + mergeLevel, offlineTableName, taskType); + continue; + } + + // Get the bucket size and buffer + long bucketMs = + TimeUtils.convertPeriodToMillis(mergeConfigs.get(MinionConstants.MergeTask.BUCKET_TIME_PERIOD_KEY)); + long bufferMs = + TimeUtils.convertPeriodToMillis(mergeConfigs.get(MinionConstants.MergeTask.BUFFER_TIME_PERIOD_KEY)); + + // Get watermark from MergeRollupTaskMetadata ZNode + // windowStartMs = watermarkMs, windowEndMs = windowStartMs + bucketTimeMs + long waterMarkMs = + getWatermarkMs(preSelectedSegments.first().getStartTimeMs(), bucketMs, mergeLevel, mergeRollupTaskMetadata); + long windowStartMs = waterMarkMs; + long windowEndMs = windowStartMs + bucketMs; + + if (!isValidMergeWindowEndTime(windowEndMs, bufferMs, lowerMergeLevel, mergeRollupTaskMetadata)) { + LOGGER.info( + "Window with start: {} and end: {} of mergeLevel: {} is not a valid merge window, Skipping task generation: {}", + windowStartMs, windowEndMs, mergeLevel, taskType); + 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; + + // The for loop terminates in following cases: + // 1. Found unmerged segments in target merge window, need to bump up watermark if windowStartMs > watermarkMs, + // will schedule tasks + // 2. All segments are merged in the merge window and we have loop through all segments, need to bump up + // watermark to windowStartMs + bucketTimeMs, skip scheduling + // 3. Current watermark > endTimeMs of all segments, won't bump up watermark, skip scheduling + // 4. Merge window is invalid (windowEndMs > System.currentTimeMillis() - bufferMs || windowEndMs > waterMark of + // the lower mergeLevel), may need to bump up watermark if windowStartMs > watermarkMs, skip scheduling + for (OfflineSegmentZKMetadata preSelectedSegment : preSelectedSegments) { + 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 + // TODO: If there are many small merged segments, we should merge them again + 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; Review comment: Good point, updated. -- This is an automated message from the Apache Git Service. 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