flyrain commented on a change in pull request #2608: URL: https://github.com/apache/iceberg/pull/2608#discussion_r635535503
########## File path: spark/src/main/java/org/apache/iceberg/spark/actions/RepairManifestHelper.java ########## @@ -0,0 +1,219 @@ +/* + * 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.spark.actions; + +import java.io.IOException; +import java.io.Serializable; +import java.io.UncheckedIOException; +import java.util.HashSet; +import java.util.Objects; +import java.util.Optional; +import java.util.Set; +import java.util.stream.Stream; +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.DataFile; +import org.apache.iceberg.DataFiles; +import org.apache.iceberg.FileFormat; +import org.apache.iceberg.ManifestFile; +import org.apache.iceberg.Metrics; +import org.apache.iceberg.MetricsConfig; +import org.apache.iceberg.PartitionSpec; +import org.apache.iceberg.Table; +import org.apache.iceberg.TableProperties; +import org.apache.iceberg.hadoop.HadoopInputFile; +import org.apache.iceberg.mapping.NameMapping; +import org.apache.iceberg.mapping.NameMappingParser; +import org.apache.iceberg.orc.OrcMetrics; +import org.apache.iceberg.parquet.ParquetUtil; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.spark.SparkDataFile; +import org.apache.iceberg.spark.SparkExceptionUtil; +import org.apache.parquet.hadoop.ParquetFileReader; +import org.apache.parquet.hadoop.metadata.ParquetMetadata; + +/** + * Helper methods to repair manifest files. + * TODO- repair split offsets + */ +public class RepairManifestHelper { + + private RepairManifestHelper() { + // Prevent Construction + } + + /** + * Given a DataFile information, return Metrics + * @param format file format + * @param status file status + * @param conf Hadoop configuration + * @param metricsSpec metrics configuration + * @param mapping name mapping + * @return metrics + */ + private static Metrics getMetrics(FileFormat format, FileStatus status, Configuration conf, + MetricsConfig metricsSpec, NameMapping mapping) { + switch (format) { + case AVRO: + return new Metrics(-1L, null, null, null); + case ORC: + return OrcMetrics.fromInputFile(HadoopInputFile.fromPath(status.getPath(), conf), + metricsSpec, mapping); + case PARQUET: + try { + ParquetMetadata metadata = ParquetFileReader.readFooter(conf, status); + return ParquetUtil.footerMetrics(metadata, Stream.empty(), metricsSpec, mapping); + } catch (IOException e) { + throw SparkExceptionUtil.toUncheckedException( + e, "Unable to read the footer of the parquet file: %s", status.getPath()); + } + default: + throw new UnsupportedOperationException("Unknown file format: " + format); + } + } + + /** + * Diffs two DataFile for potential for repair + * @return a set of fields in human-readable format that differ between these DataFiles + */ + static Set<String> diff(DataFile first, DataFile second) { + Set<String> result = new HashSet<>(); + if (first.fileSizeInBytes() != second.fileSizeInBytes()) { + result.add("file_size_in_bytes"); + } + if (first.recordCount() != second.recordCount()) { + result.add("record_count"); + } + if (!Objects.equals(first.columnSizes(), second.columnSizes())) { + result.add("column_sizes"); + } + if (!Objects.equals(first.valueCounts(), second.valueCounts())) { + result.add("value_counts"); + } + if (!Objects.equals(first.nullValueCounts(), second.nullValueCounts())) { + result.add("null_value_counts"); + } + if (!Objects.equals(first.nanValueCounts(), second.nanValueCounts())) { + result.add("nan_value_counts"); + } + if (!Objects.equals(first.lowerBounds(), second.lowerBounds())) { + result.add("lower_bounds"); + } + if (!Objects.equals(first.upperBounds(), second.upperBounds())) { + result.add("upper_bounds"); + } + return result; + } + + /** + * Given a data file pointer, return a repaired version if actual file information does not match. + * @param file spark data file + * @param spec user-specified spec + * @param table table information + * @param conf Hadoop configuration + * @return A repaired DataFile if repair was done (file information did not match), or None if not + */ + static Optional<RepairedDataFile> repairDataFile(SparkDataFile file, + Table table, + PartitionSpec spec, + Configuration conf) { + DataFiles.Builder newDfBuilder = DataFiles.builder(spec).copy(file); + Path path = new Path(file.path().toString()); + try { + FileSystem fs = path.getFileSystem(conf); + FileStatus status = fs.getFileStatus(path); + newDfBuilder.withStatus(status); + String nameMappingString = table.properties().get(TableProperties.DEFAULT_NAME_MAPPING); + NameMapping nameMapping = nameMappingString != null ? NameMappingParser.fromJson(nameMappingString) : null; + newDfBuilder.withMetrics(getMetrics(file.format(), status, conf, + MetricsConfig.fromProperties(table.properties()), nameMapping)); + + DataFile newFile = newDfBuilder.build(); + Set<String> diff = RepairManifestHelper.diff(file, newFile); + if (diff.isEmpty()) { + return Optional.empty(); + } else { + return Optional.of(new RepairedDataFile(newFile, diff)); + } + } catch (IOException e) { + throw new UncheckedIOException(e); + } + } + + /** + * Represents a repaired DataFile + */ + public static class RepairedDataFile { Review comment: Maybe put this comment into class's comment as well, "Needs to be public for Spark serialization"? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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