unical1988 commented on code in PR #728: URL: https://github.com/apache/incubator-xtable/pull/728#discussion_r2190435450
########## xtable-core/src/main/java/org/apache/xtable/parquet/ParquetConversionSource.java: ########## @@ -0,0 +1,256 @@ +/* + * 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.xtable.parquet; + +import java.io.IOException; +import java.time.Instant; +import java.util.*; +import java.util.stream.Collectors; + +import lombok.Builder; +import lombok.NonNull; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.*; +import org.apache.hadoop.util.functional.RemoteIterators; +import org.apache.parquet.hadoop.metadata.ParquetMetadata; +import org.apache.parquet.schema.MessageType; + +import org.apache.xtable.model.*; +import org.apache.xtable.model.CommitsBacklog; +import org.apache.xtable.model.InstantsForIncrementalSync; +import org.apache.xtable.model.TableChange; +import org.apache.xtable.model.schema.InternalPartitionField; +import org.apache.xtable.model.schema.InternalSchema; +import org.apache.xtable.model.storage.*; +import org.apache.xtable.model.storage.FileFormat; +import org.apache.xtable.model.storage.InternalDataFile; +import org.apache.xtable.spi.extractor.ConversionSource; + +@Builder +// @NoArgsConstructor(access = AccessLevel.PRIVATE) +public class ParquetConversionSource implements ConversionSource<Long> { + @Builder.Default + private static final ParquetSchemaExtractor schemaExtractor = + ParquetSchemaExtractor.getInstance(); + + @Builder.Default + private static final ParquetMetadataExtractor parquetMetadataExtractor = + ParquetMetadataExtractor.getInstance(); + + @Builder.Default + private static final ParquetPartitionValueExtractor partitionValueExtractor = + ParquetPartitionValueExtractor.getInstance(); + + @Builder.Default + private static final ParquetStatsExtractor parquetStatsExtractor = + ParquetStatsExtractor.getInstance(); + + private final String tableName; + private final String basePath; + private final String configPath; + @NonNull private final Configuration hadoopConf; + + private InternalTable getMostRecentTable(List<LocatedFileStatus> parquetFiles) { + Optional<LocatedFileStatus> latestFile = getMostRecentParquetFile(parquetFiles); + ParquetMetadata parquetMetadata = + parquetMetadataExtractor.readParquetMetadata(hadoopConf, latestFile.get().getPath()); + + List<InternalPartitionField> partitionFields = + partitionValueExtractor.extractParquertPartitions( + parquetMetadata, latestFile.get().getPath().toString()); + MessageType parquetSchema = parquetMetadataExtractor.getSchema(parquetMetadata); + InternalSchema schema = + schemaExtractor.toInternalSchema(parquetSchema, latestFile.get().getPath().toString()); + DataLayoutStrategy dataLayoutStrategy = + partitionFields.isEmpty() + ? DataLayoutStrategy.FLAT + : DataLayoutStrategy.HIVE_STYLE_PARTITION; + return InternalTable.builder() + .tableFormat(TableFormat.PARQUET) + .basePath(basePath) + .name(tableName) + .layoutStrategy(dataLayoutStrategy) + .partitioningFields(partitionFields) + .readSchema(schema) + .latestCommitTime(Instant.ofEpochMilli(latestFile.get().getModificationTime())) + .build(); + } + + @Override + public InternalTable getTable(Long modificationTime) { + return null; + } + + private List<InternalDataFile> getInternalDataFiles(List<LocatedFileStatus> parquetFiles) { + return parquetFiles.stream() + .map( + file -> + InternalDataFile.builder() + .physicalPath(file.getPath().toString()) + .fileFormat(FileFormat.APACHE_PARQUET) + .fileSizeBytes(file.getLen()) + .partitionValues( + partitionValueExtractor.extractPartitionValues( + partitionValueExtractor.extractParquertPartitions( + parquetMetadataExtractor.readParquetMetadata( + hadoopConf, file.getPath()), + file.getPath().toString()), + basePath)) + .lastModified(file.getModificationTime()) + .columnStats( + parquetStatsExtractor.getColumnStatsForaFile( + parquetMetadataExtractor.readParquetMetadata( + hadoopConf, file.getPath()))) + .build()) + .collect(Collectors.toList()); + } + + private InternalDataFile createInternalDataFileFromParquetFile(FileStatus parquetFile) { + return InternalDataFile.builder() + .physicalPath(parquetFile.getPath().toString()) + .partitionValues( + partitionValueExtractor.extractPartitionValues( + partitionValueExtractor.extractParquertPartitions( + parquetMetadataExtractor.readParquetMetadata(hadoopConf, parquetFile.getPath()), + parquetFile.getPath().toString()), + basePath)) + .lastModified(parquetFile.getModificationTime()) + .fileSizeBytes(parquetFile.getLen()) + .columnStats( + parquetStatsExtractor.getColumnStatsForaFile( + parquetMetadataExtractor.readParquetMetadata(hadoopConf, parquetFile.getPath()))) + .build(); + } + + @Override + public CommitsBacklog<Long> getCommitsBacklog(InstantsForIncrementalSync syncInstants) { + // based on either table formats? + List<Long> commitsToProcess = + Collections.singletonList(syncInstants.getLastSyncInstant().toEpochMilli()); + return CommitsBacklog.<Long>builder().commitsToProcess(commitsToProcess).build(); + } + + @Override + public TableChange getTableChangeForCommit(Long modificationTime) { + List<LocatedFileStatus> parquetFiles = getParquetFiles(hadoopConf, basePath); + // if a file is found in tableChangesAfter and wasnt in the list of tableChangesBefore then it + // was added + // if a file wasnot found in tableChangesAfter and it was in the list of tableChangesBefore then + // it was removed + Set<InternalDataFile> removedInternalDataFiles = new HashSet<>(); + Set<InternalDataFile> addedInternalDataFiles = new HashSet<>(); + + List<FileStatus> tableChangesAfter = + parquetFiles.stream() + .filter(fileStatus -> fileStatus.getModificationTime() > modificationTime) + .collect(Collectors.toList()); + List<FileStatus> tableChangesBefore = + parquetFiles.stream() + .filter(fileStatus -> fileStatus.getModificationTime() < modificationTime) + .collect(Collectors.toList()); + InternalTable internalTable = getMostRecentTable(parquetFiles); + List<FileStatus> keptFiles = new ArrayList<>(); + List<FileStatus> removedFiles = new ArrayList<>(tableChangesBefore); + + for (FileStatus tableStatus : tableChangesAfter) { + boolean isPresent = tableChangesBefore.contains(tableStatus); + if (!isPresent) { + InternalDataFile currentDataFile = createInternalDataFileFromParquetFile(tableStatus); + addedInternalDataFiles.add(currentDataFile); + } else { + keptFiles.add(tableStatus); + } + } + removedFiles.removeAll(keptFiles); + for (FileStatus removedFile : removedFiles) { + InternalDataFile currentDataFile = createInternalDataFileFromParquetFile(removedFile); + removedInternalDataFiles.add(currentDataFile); + } + return TableChange.builder() + .tableAsOfChange(internalTable) + .filesDiff( + InternalFilesDiff.builder() + .filesAdded(addedInternalDataFiles) + .filesRemoved(removedInternalDataFiles) + .build()) + .build(); + } + + @Override + public InternalTable getCurrentTable() { + return null; + } + + /** + * Here to get current snapshot listing all files hence the -1 is being passed + * + * @return + */ + @Override + public InternalSnapshot getCurrentSnapshot() { + List<LocatedFileStatus> parquetFiles = getParquetFiles(hadoopConf, basePath); + List<InternalDataFile> internalDataFiles = getInternalDataFiles(parquetFiles); + InternalTable table = getMostRecentTable(parquetFiles); + return InternalSnapshot.builder() + .table(table) + .partitionedDataFiles(PartitionFileGroup.fromFiles(internalDataFiles)) + .build(); + } + + private Optional<LocatedFileStatus> getMostRecentParquetFile( + List<LocatedFileStatus> parquetFiles) { + return parquetFiles.stream().max(Comparator.comparing(FileStatus::getModificationTime)); + } + + private List<LocatedFileStatus> getParquetFilesInRange( + List<LocatedFileStatus> parquetFiles, Long minModificationDate, Long maxModicationDate) { + return parquetFiles.stream() + .filter( + fileStatus -> + fileStatus.getModificationTime() > minModificationDate + && fileStatus.getModificationTime() < maxModicationDate) + .collect(Collectors.toList()); + } + + private List<LocatedFileStatus> getParquetFiles(Configuration hadoopConf, String basePath) { + try { + FileSystem fs = FileSystem.get(hadoopConf); + RemoteIterator<LocatedFileStatus> iterator = fs.listFiles(new Path(basePath), true); + return RemoteIterators.toList(iterator).stream() + .filter(file -> file.getPath().getName().endsWith("parquet")) + .collect(Collectors.toList()); + } catch (IOException e) { // + throw new RuntimeException(e); + } + } + + @Override + public boolean isIncrementalSyncSafeFrom(Instant instant) { + return false; + } + + @Override + public String getCommitIdentifier(Long aLong) { + return null; Review Comment: would return `String.valueOf(aLong)` do it? 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