nsivabalan commented on a change in pull request #3472: URL: https://github.com/apache/hudi/pull/3472#discussion_r688834040
########## File path: hudi-common/src/main/java/org/apache/hudi/common/util/MarkerUtils.java ########## @@ -0,0 +1,179 @@ +/* + * 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.hudi.common.util; + +import org.apache.hudi.common.config.SerializableConfiguration; +import org.apache.hudi.common.engine.HoodieEngineContext; +import org.apache.hudi.common.table.marker.MarkerType; +import org.apache.hudi.common.util.collection.ImmutablePair; +import org.apache.hudi.exception.HoodieException; +import org.apache.hudi.exception.HoodieIOException; + +import org.apache.hadoop.fs.FSDataInputStream; +import org.apache.hadoop.fs.FSDataOutputStream; +import org.apache.hadoop.fs.FileStatus; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; +import org.apache.log4j.LogManager; +import org.apache.log4j.Logger; + +import java.io.BufferedReader; +import java.io.BufferedWriter; +import java.io.IOException; +import java.io.InputStreamReader; +import java.io.OutputStreamWriter; +import java.nio.charset.StandardCharsets; +import java.util.Arrays; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.function.Predicate; +import java.util.stream.Collectors; + +import static org.apache.hudi.common.util.FileIOUtils.closeQuietly; + +/** + * A utility class for marker related operations. + */ +public class MarkerUtils { + public static final String MARKERS_FILENAME_PREFIX = "MARKERS"; + public static final String MARKER_TYPE_FILENAME = MARKERS_FILENAME_PREFIX + ".type"; + private static final Logger LOG = LogManager.getLogger(MarkerUtils.class); + + /** + * Reads the marker type from `MARKERS.type` file. + * + * @param fileSystem file system to use. + * @param markerDir marker directory. + * @return the marker type, or empty if the marker type file does not exist. + */ + public static Option<MarkerType> readMarkerType(FileSystem fileSystem, String markerDir) { + Path markerTypeFilePath = new Path(markerDir, MARKER_TYPE_FILENAME); + FSDataInputStream fsDataInputStream = null; + Option<MarkerType> content = Option.empty(); + try { + if (!fileSystem.exists(markerTypeFilePath)) { + return Option.empty(); + } + fsDataInputStream = fileSystem.open(markerTypeFilePath); + content = Option.of(MarkerType.valueOf(FileIOUtils.readAsUTFString(fsDataInputStream))); + } catch (IOException e) { + throw new HoodieIOException("Cannot read marker type file " + markerTypeFilePath.toString() + + "; " + e.getMessage(), e); + } finally { + closeQuietly(fsDataInputStream); + } + return content; + } + + /** + * Writes the marker type to the file `MARKERS.type`. + * + * @param markerType marker type. + * @param fileSystem file system to use. + * @param markerDir marker directory. + */ + public static void writeMarkerTypeToFile(MarkerType markerType, FileSystem fileSystem, String markerDir) { + Path markerTypeFilePath = new Path(markerDir, MARKER_TYPE_FILENAME); + FSDataOutputStream fsDataOutputStream = null; + BufferedWriter bufferedWriter = null; + try { + fsDataOutputStream = fileSystem.create(markerTypeFilePath, false); + bufferedWriter = new BufferedWriter(new OutputStreamWriter(fsDataOutputStream, StandardCharsets.UTF_8)); + bufferedWriter.write(markerType.toString()); + } catch (IOException e) { + throw new HoodieException("Failed to create marker type file " + markerTypeFilePath.toString() + + "; " + e.getMessage(), e); + } finally { + closeQuietly(bufferedWriter); + closeQuietly(fsDataOutputStream); + } + } + + /** + * Deletes `MARKERS.type` file. + * + * @param fileSystem file system to use. + * @param markerDir marker directory. + */ + public static void deleteMarkerTypeFile(FileSystem fileSystem, String markerDir) { + Path markerTypeFilePath = new Path(markerDir, MARKER_TYPE_FILENAME); + try { + fileSystem.delete(markerTypeFilePath, false); + } catch (IOException e) { + throw new HoodieIOException("Cannot delete marker type file " + markerTypeFilePath.toString() + + "; " + e.getMessage(), e); + } + } + + /** + * Reads files containing the markers written by timeline-server-based marker mechanism. + * + * @param markerDir marker directory. + * @param fileSystem file system to use. + * @param context instance of {@link HoodieEngineContext} to use + * @param parallelism parallelism to use + * @return A {@code Map} of file name to the set of markers stored in the file. + */ + public static Map<String, Set<String>> readTimelineServerBasedMarkersFromFileSystem( + String markerDir, FileSystem fileSystem, HoodieEngineContext context, int parallelism) { + Path dirPath = new Path(markerDir); + try { + if (fileSystem.exists(dirPath)) { + FileStatus[] fileStatuses = fileSystem.listStatus(dirPath); + Predicate<String> prefixFilter = pathStr -> pathStr.contains(MARKERS_FILENAME_PREFIX); + Predicate<String> markerTypeFilter = pathStr -> !pathStr.equals(MARKER_TYPE_FILENAME); Review comment: I thought you wanted to change this to contains. -- This is an automated message from the Apache Git Service. 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