Parquet Incremental Sync #768
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.xtable.parquet; | ||
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| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.nio.file.Paths; | ||
| import java.util.*; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.Stream; | ||
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| import lombok.AccessLevel; | ||
| import lombok.Getter; | ||
| import lombok.RequiredArgsConstructor; | ||
| import lombok.extern.log4j.Log4j2; | ||
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| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.fs.*; | ||
| import org.apache.hadoop.util.functional.RemoteIterators; | ||
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| import org.apache.xtable.exception.ReadException; | ||
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| /** | ||
| * Manages Parquet File's Metadata | ||
| * | ||
| * <p>This class provides functions to handle Parquet metadata, creating metadata objects from | ||
| * parquet files and filtering the files based on the modification times. | ||
| */ | ||
| @Log4j2 | ||
| @RequiredArgsConstructor | ||
| public class ParquetDataManager { | ||
| private final Configuration hadoopConf; | ||
| private final String basePath; | ||
| private final FileSystem fileSystem; | ||
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| public ParquetDataManager(Configuration hadoopConf, String basePath) { | ||
| this.hadoopConf = hadoopConf; | ||
| this.basePath = basePath; | ||
| try { | ||
| URI uri = Paths.get(basePath).toUri(); | ||
| this.fileSystem = FileSystem.get(uri, hadoopConf); | ||
| } catch (IOException e) { | ||
| throw new ReadException("Unable to initialize file system for base path: " + basePath, e); | ||
| } | ||
| } | ||
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| @Getter(value = AccessLevel.PRIVATE, lazy = true) | ||
| private final List<LocatedFileStatus> parquetFiles = loadParquetFiles(); | ||
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| ParquetFileInfo getMostRecentParquetFile() { | ||
| LocatedFileStatus file = | ||
| getParquetFiles().stream() | ||
| .max(Comparator.comparing(LocatedFileStatus::getModificationTime)) | ||
| .orElseThrow(() -> new IllegalStateException("No files found")); | ||
| return new ParquetFileInfo(hadoopConf, file); | ||
| } | ||
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| ParquetFileInfo getParquetDataFileAt(long targetTime) { | ||
| return getParquetFiles().stream() | ||
| .filter(file -> file.getModificationTime() >= targetTime) | ||
| .min(Comparator.comparing(LocatedFileStatus::getModificationTime)) | ||
| .map(file -> new ParquetFileInfo(hadoopConf, file)) | ||
| .orElseThrow(() -> new IllegalStateException("No file found at or after " + targetTime)); | ||
| } | ||
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| private List<LocatedFileStatus> loadParquetFiles() { | ||
| try { | ||
| RemoteIterator<LocatedFileStatus> iterator = fileSystem.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 ReadException("Unable to read files from file system", e); | ||
| } | ||
| } | ||
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| Stream<ParquetFileInfo> getCurrentFileInfo() { | ||
|
Contributor
Author
There was a problem hiding this comment. @the-other-tim-brown You would want to rename this to the plural (getCurrentFilesInfo())? |
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| return getParquetFiles().stream() | ||
| .map(fileStatus -> new ParquetFileInfo(hadoopConf, fileStatus)); | ||
| } | ||
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| List<ParquetFileInfo> getParquetFilesMetadataAfterTime(long syncTime) { | ||
| return getParquetFiles().stream() | ||
| .filter(file -> file.getModificationTime() >= syncTime) | ||
| .map(file -> new ParquetFileInfo(hadoopConf, file)) | ||
| .collect(Collectors.toList()); | ||
| } | ||
| } | ||
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