aokolnychyi commented on a change in pull request #894: Spark: Implement an action to remove orphan files URL: https://github.com/apache/incubator-iceberg/pull/894#discussion_r406802872
########## File path: spark/src/main/java/org/apache/iceberg/RemoveOrphanFilesAction.java ########## @@ -0,0 +1,239 @@ +/* + * 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; + +import com.google.common.collect.Lists; +import java.io.IOException; +import java.util.Iterator; +import java.util.List; +import java.util.function.Consumer; +import java.util.function.Predicate; +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.FileStatus; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; +import org.apache.iceberg.exceptions.RuntimeIOException; +import org.apache.iceberg.hadoop.HiddenPathFilter; +import org.apache.iceberg.util.Tasks; +import org.apache.spark.api.java.JavaRDD; +import org.apache.spark.api.java.JavaSparkContext; +import org.apache.spark.api.java.function.FlatMapFunction; +import org.apache.spark.broadcast.Broadcast; +import org.apache.spark.sql.Column; +import org.apache.spark.sql.Dataset; +import org.apache.spark.sql.Encoders; +import org.apache.spark.sql.Row; +import org.apache.spark.sql.SparkSession; +import org.apache.spark.util.SerializableConfiguration; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import parquet.Preconditions; + +public class RemoveOrphanFilesAction implements Action<List<String>> { + + private static final Logger LOG = LoggerFactory.getLogger(RemoveOrphanFilesAction.class); + + private final SparkSession spark; + private final JavaSparkContext sparkContext; + private final SerializableConfiguration hadoopConf; + private final int partitionDiscoveryParallelism; + private final Table table; + private final TableOperations ops; + + private String location = null; + private Long olderThanTimestamp = null; + private Consumer<String> deleteFunc = new Consumer<String>() { + @Override + public void accept(String file) { + table.io().deleteFile(file); + } + }; + + RemoveOrphanFilesAction(SparkSession spark, Table table) { + this.spark = spark; + this.sparkContext = new JavaSparkContext(spark.sparkContext()); + this.hadoopConf = new SerializableConfiguration(spark.sessionState().newHadoopConf()); + this.partitionDiscoveryParallelism = spark.sessionState().conf().parallelPartitionDiscoveryParallelism(); + this.table = table; + this.ops = ((HasTableOperations) table).operations(); + this.location = table.location(); + } + + public RemoveOrphanFilesAction location(String newLocation) { + this.location = newLocation; + return this; + } + + public RemoveOrphanFilesAction olderThan(long newOlderThanTimestamp) { + this.olderThanTimestamp = newOlderThanTimestamp; + return this; + } + + public RemoveOrphanFilesAction deleteWith(Consumer<String> newDeleteFunc) { + this.deleteFunc = newDeleteFunc; + return this; + } + + @Override + public List<String> execute() { + Preconditions.checkArgument(olderThanTimestamp != null, "olderThanTimestamp must be set"); + + Dataset<Row> validDataFileDF = buildValidDataFileDF(); + Dataset<Row> validMetadataFileDF = buildValidMetadataFileDF(); + Dataset<Row> validFileDF = validDataFileDF.union(validMetadataFileDF); + Dataset<Row> actualFileDF = buildActualFileDF(); + + Column joinCond = validFileDF.col("file_path").equalTo(actualFileDF.col("file_path")); + List<String> orphanFiles = actualFileDF.join(validFileDF, joinCond, "leftanti") + .as(Encoders.STRING()) + .collectAsList(); + + Tasks.foreach(orphanFiles) + .noRetry() + .suppressFailureWhenFinished() + .onFailure((file, exc) -> LOG.warn("Failed to delete file: {}", file, exc)) + .run(deleteFunc::accept); + + return orphanFiles; + } + + private Dataset<Row> buildValidDataFileDF() { + String allDataFilesMetadataTable = metadataTableName(MetadataTableType.ALL_DATA_FILES); + return spark.read().format("iceberg") + .load(allDataFilesMetadataTable) + .select("file_path"); + } + + private Dataset<Row> buildValidMetadataFileDF() { + String allManifestsMetadataTable = metadataTableName(MetadataTableType.ALL_MANIFESTS); + Dataset<Row> manifestDF = spark.read().format("iceberg") + .load(allManifestsMetadataTable) + .selectExpr("path as file_path"); + + List<String> otherMetadataFiles = Lists.newArrayList(); + + for (Snapshot snapshot : table.snapshots()) { + String manifestListLocation = snapshot.manifestListLocation(); + if (manifestListLocation != null) { + otherMetadataFiles.add(manifestListLocation); + } + } + + otherMetadataFiles.add(ops.metadataFileLocation("version-hint.text")); + + TableMetadata metadata = ops.current(); + otherMetadataFiles.add(metadata.file().location()); + for (TableMetadata.MetadataLogEntry previousMetadataFile : metadata.previousFiles()) { + otherMetadataFiles.add(previousMetadataFile.file()); + } + + Dataset<Row> otherMetadataFileDF = spark + .createDataset(otherMetadataFiles, Encoders.STRING()) + .toDF("file_path"); + + return manifestDF.union(otherMetadataFileDF); + } + + private Dataset<Row> buildActualFileDF() { + List<String> topLevelDirs = Lists.newArrayList(); + List<String> matchingTopLevelFiles = Lists.newArrayList(); + + try { + Path path = new Path(location); Review comment: Actually, ignore my previous comment. 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