stevenzwu commented on code in PR #11144: URL: https://github.com/apache/iceberg/pull/11144#discussion_r1777436962
########## flink/v1.20/flink/src/main/java/org/apache/iceberg/flink/maintenance/api/ExpireSnapshots.java: ########## @@ -0,0 +1,138 @@ +/* + * 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.iceberg.flink.maintenance.api; + +import java.time.Duration; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator; +import org.apache.iceberg.Snapshot; +import org.apache.iceberg.SystemConfigs; +import org.apache.iceberg.flink.maintenance.operator.DeleteFilesProcessor; +import org.apache.iceberg.flink.maintenance.operator.ExpireSnapshotsProcessor; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; + +/** Deletes expired snapshots and the corresponding files. */ +public class ExpireSnapshots { + private static final int DELETE_BATCH_SIZE_DEFAULT = 1000; + private static final String EXECUTOR_OPERATOR_NAME = "Expire Snapshot"; + @VisibleForTesting static final String DELETE_FILES_OPERATOR_NAME = "Delete file"; + + private ExpireSnapshots() { + // Do not instantiate directly + } + + /** Creates the builder for creating a stream which expires snapshots for the table. */ + public static Builder builder() { + return new Builder(); + } + + public static class Builder extends MaintenanceTaskBuilder<ExpireSnapshots.Builder> { + private Duration maxSnapshotAge = null; + private Integer numSnapshots = null; + private int planningWorkerPoolSize = SystemConfigs.WORKER_THREAD_POOL_SIZE.value(); + private int deleteBatchSize = DELETE_BATCH_SIZE_DEFAULT; + private int deleteParallelism = 1; + + /** + * The snapshots older than this age will be removed. + * + * @param newMaxSnapshotAge of the snapshots to be removed + */ + public Builder maxSnapshotAge(Duration newMaxSnapshotAge) { + this.maxSnapshotAge = newMaxSnapshotAge; + return this; + } + + /** + * The minimum number of {@link Snapshot}s to retain. For more details description see {@link + * org.apache.iceberg.ExpireSnapshots#retainLast(int)}. + * + * @param newNumSnapshots number of snapshots to retain + */ + public Builder retainLast(int newNumSnapshots) { + this.numSnapshots = newNumSnapshots; + return this; + } + + /** + * The worker pool size used to calculate the files to delete. + * + * @param newPlanningWorkerPoolSize for planning files to delete + */ + public Builder planningWorkerPoolSize(int newPlanningWorkerPoolSize) { + this.planningWorkerPoolSize = newPlanningWorkerPoolSize; + return this; + } + + /** + * Size of the batch used to deleting the files. + * + * @param newDeleteBatchSize used for deleting + */ + public Builder deleteBatchSize(int newDeleteBatchSize) { + this.deleteBatchSize = newDeleteBatchSize; + return this; + } + + /** + * The number of subtasks which are doing the deletes. + * + * @param newDeleteParallelism used for deleting + */ + public Builder deleteParallelism(int newDeleteParallelism) { + this.deleteParallelism = newDeleteParallelism; + return this; + } + + @Override + DataStream<TaskResult> append(DataStream<Trigger> trigger) { + Preconditions.checkNotNull(tableLoader(), "TableLoader should not be null"); + + SingleOutputStreamOperator<TaskResult> result = + trigger + .process( + new ExpireSnapshotsProcessor( + tableLoader(), + maxSnapshotAge == null ? null : maxSnapshotAge.toMillis(), + numSnapshots, + planningWorkerPoolSize)) + .name(EXECUTOR_OPERATOR_NAME) + .uid(EXECUTOR_OPERATOR_NAME + uidSuffix()) + .slotSharingGroup(slotSharingGroup()) + .forceNonParallel(); + + result + .getSideOutput(ExpireSnapshotsProcessor.DELETE_STREAM) + .rebalance() + .transform( + DELETE_FILES_OPERATOR_NAME, + TypeInformation.of(Void.class), + new DeleteFilesProcessor(name(), tableLoader(), deleteBatchSize)) + .name(DELETE_FILES_OPERATOR_NAME) Review Comment: index is less friendly. users would be some like `Delete file 1` in Filnk UI. `uidSuffix` typically contains more meaningful id/name like Iceberg table name -- This is an automated message from the Apache Git Service. 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