RussellSpitzer commented on a change in pull request #1264: URL: https://github.com/apache/iceberg/pull/1264#discussion_r466621380
########## File path: spark/src/main/java/org/apache/iceberg/actions/ExpireSnapshotsAction.java ########## @@ -0,0 +1,178 @@ +/* + * 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.actions; + +import java.util.Iterator; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.atomic.AtomicLong; +import java.util.function.Consumer; +import org.apache.iceberg.ExpireSnapshots; +import org.apache.iceberg.HasTableOperations; +import org.apache.iceberg.Table; +import org.apache.iceberg.TableOperations; +import org.apache.iceberg.exceptions.NotFoundException; +import org.apache.iceberg.relocated.com.google.common.util.concurrent.MoreExecutors; +import org.apache.iceberg.util.Tasks; +import org.apache.spark.sql.Column; +import org.apache.spark.sql.Dataset; +import org.apache.spark.sql.Row; +import org.apache.spark.sql.SparkSession; +import org.apache.spark.sql.functions; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class ExpireSnapshotsAction extends BaseAction<ExpireSnapshotsActionResult> { + private static final Logger LOG = LoggerFactory.getLogger(ExpireSnapshotsAction.class); + + private static final String DATA_FILE = "Data File"; + private static final String MANIFEST = "Manifest"; + private static final String MANIFEST_LIST = "Manifest List"; + + // Creates an executor service that runs each task in the thread that invokes execute/submit. + private static final ExecutorService DEFAULT_DELETE_EXECUTOR_SERVICE = MoreExecutors.newDirectExecutorService(); + + private final SparkSession spark; + private final Table table; + private final TableOperations ops; + private final Consumer<String> defaultDelete = new Consumer<String>() { + @Override + public void accept(String file) { + ops.io().deleteFile(file); + } + }; + + private Long expireSnapshotIdValue = null; + private Long expireOlderThanValue = null; + private Integer retainLastValue = null; + private Consumer<String> deleteFunc = defaultDelete; + private ExecutorService deleteExecutorService = DEFAULT_DELETE_EXECUTOR_SERVICE; + + ExpireSnapshotsAction(SparkSession spark, Table table) { + this.spark = spark; + this.table = table; + this.ops = ((HasTableOperations) table).operations(); + } + + @Override + protected Table table() { + return table; + } + + /** + * An executor service used when deleting files. Only used during the local delete phase of this Spark action + * @param executorService the service to use + * @return this for method chaining + */ + public ExpireSnapshotsAction executeDeleteWith(ExecutorService executorService) { + this.deleteExecutorService = executorService; + return this; + } + + public ExpireSnapshotsAction expireSnapshotId(long expireSnapshotId) { + this.expireSnapshotIdValue = expireSnapshotId; + return this; + } + + public ExpireSnapshotsAction expireOlderThan(long timestampMillis) { + this.expireOlderThanValue = timestampMillis; + return this; + } + + public ExpireSnapshotsAction retainLast(int numSnapshots) { + this.retainLastValue = numSnapshots; + return this; + } + + public ExpireSnapshotsAction deleteWith(Consumer<String> newDeleteFunc) { + this.deleteFunc = newDeleteFunc; + return this; + } + + @Override + public ExpireSnapshotsActionResult execute() { + //Metadata before Expiration + Dataset<Row> originalFiles = buildValidFileDF().persist(); + originalFiles.count(); // Action to trigger persist + + //Perform Expiration + ExpireSnapshots expireSnaps = table.expireSnapshots().cleanExpiredFiles(false); + if (expireSnapshotIdValue != null) { + expireSnaps = expireSnaps.expireSnapshotId(expireSnapshotIdValue); + } + if (expireOlderThanValue != null) { + expireSnaps = expireSnaps.expireOlderThan(expireOlderThanValue); + } + if (retainLastValue != null) { + expireSnaps = expireSnaps.retainLast(retainLastValue); + } + expireSnaps.commit(); + + // Metadata after Expiration + Dataset<Row> validFiles = buildValidFileDF(); + Dataset<Row> filesToDelete = originalFiles.except(validFiles); + + ExpireSnapshotsActionResult result = deleteFiles(filesToDelete.toLocalIterator()); + originalFiles.unpersist(); + return result; + } + + private Dataset<Row> appendTypeString(Dataset<Row> ds, String type) { + return ds.select(new Column("file_path"), functions.lit(type).as("file_type")); + } + + private Dataset<Row> buildValidFileDF() { + return appendTypeString(buildValidDataFileDF(spark), DATA_FILE) + .union(appendTypeString(buildManifestFileDF(spark), MANIFEST)) + .union(appendTypeString(buildManifestListDF(spark, table), MANIFEST_LIST)); + } + + private ExpireSnapshotsActionResult deleteFiles(Iterator<Row> paths) { Review comment: sgtm ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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