kfaraz commented on code in PR #18028: URL: https://github.com/apache/druid/pull/18028#discussion_r2114252654
########## indexing-service/src/main/java/org/apache/druid/indexing/overlord/duty/UnusedSegmentsKiller.java: ########## @@ -0,0 +1,472 @@ +/* + * 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.indexing.overlord.duty; + +import com.google.common.collect.Ordering; +import com.google.inject.Inject; +import org.apache.druid.client.indexing.IndexingService; +import org.apache.druid.common.utils.IdUtils; +import org.apache.druid.discovery.DruidLeaderSelector; +import org.apache.druid.indexer.TaskStatus; +import org.apache.druid.indexing.common.TaskToolbox; +import org.apache.druid.indexing.common.actions.TaskActionClient; +import org.apache.druid.indexing.common.actions.TaskActionClientFactory; +import org.apache.druid.indexing.common.task.IndexTaskUtils; +import org.apache.druid.indexing.common.task.KillUnusedSegmentsTask; +import org.apache.druid.indexing.common.task.TaskMetrics; +import org.apache.druid.indexing.common.task.Tasks; +import org.apache.druid.indexing.overlord.IndexerMetadataStorageCoordinator; +import org.apache.druid.indexing.overlord.TaskLockbox; +import org.apache.druid.java.util.common.DateTimes; +import org.apache.druid.java.util.common.Stopwatch; +import org.apache.druid.java.util.common.concurrent.ScheduledExecutorFactory; +import org.apache.druid.java.util.common.guava.Comparators; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.java.util.emitter.service.ServiceEmitter; +import org.apache.druid.java.util.emitter.service.ServiceMetricEvent; +import org.apache.druid.metadata.SegmentsMetadataManagerConfig; +import org.apache.druid.metadata.UnusedSegmentKillerConfig; +import org.apache.druid.query.DruidMetrics; +import org.apache.druid.segment.loading.DataSegmentKiller; +import org.apache.druid.timeline.DataSegment; +import org.joda.time.DateTime; +import org.joda.time.Duration; +import org.joda.time.Interval; + +import javax.annotation.Nullable; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.Future; +import java.util.concurrent.PriorityBlockingQueue; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.atomic.AtomicReference; + +/** + * {@link OverlordDuty} to delete unused segments from metadata store and the + * deep storage. Launches {@link EmbeddedKillTask}s to clean unused segments + * of a single datasource-interval. + * + * @see SegmentsMetadataManagerConfig to enable the cleanup + */ +public class UnusedSegmentsKiller implements OverlordDuty +{ + private static final Logger log = new Logger(UnusedSegmentsKiller.class); + + private static final String TASK_ID_PREFIX = "overlord-issued"; + + /** + * Period after which the queue is reset even if there are existing jobs in queue. + */ + private static final Duration QUEUE_RESET_PERIOD = Duration.standardDays(1); + + /** + * Duration for which a kill task is allowed to run. + */ + private static final Duration MAX_TASK_DURATION = Duration.standardMinutes(10); + + private final ServiceEmitter emitter; + private final TaskLockbox taskLockbox; + private final DruidLeaderSelector leaderSelector; + private final DataSegmentKiller dataSegmentKiller; + + private final UnusedSegmentKillerConfig killConfig; + private final TaskActionClientFactory taskActionClientFactory; + private final IndexerMetadataStorageCoordinator storageCoordinator; + + /** + * Single-threaded executor to process kill jobs. + */ + private final ScheduledExecutorService exec; + private int previousLeaderTerm; + private final AtomicReference<DateTime> lastResetTime = new AtomicReference<>(null); + + private final AtomicReference<TaskInfo> currentTaskInfo = new AtomicReference<>(null); + + /** + * Queue of kill candidates. Use a PriorityBlockingQueue to ensure thread-safety + * since this queue is accessed by both {@link #run()} and {@link #startNextJobInKillQueue}. + */ + private final PriorityBlockingQueue<KillCandidate> killQueue; + + @Inject + public UnusedSegmentsKiller( + SegmentsMetadataManagerConfig config, + TaskActionClientFactory taskActionClientFactory, + IndexerMetadataStorageCoordinator storageCoordinator, + @IndexingService DruidLeaderSelector leaderSelector, + ScheduledExecutorFactory executorFactory, + DataSegmentKiller dataSegmentKiller, + TaskLockbox taskLockbox, + ServiceEmitter emitter + ) + { + this.emitter = emitter; + this.taskLockbox = taskLockbox; + this.leaderSelector = leaderSelector; + this.dataSegmentKiller = dataSegmentKiller; + this.storageCoordinator = storageCoordinator; + this.taskActionClientFactory = taskActionClientFactory; + + this.killConfig = config.getKillUnused(); + + if (isEnabled()) { + this.exec = executorFactory.create(1, "UnusedSegmentsKiller-%s"); + this.killQueue = new PriorityBlockingQueue<>( + 1000, Review Comment: 😃 -- This is an automated message from the Apache Git Service. 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