| /* |
| * 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.utilities.sources.helpers; |
| |
| import org.apache.hudi.DataSourceUtils; |
| import org.apache.hudi.common.config.TypedProperties; |
| import org.apache.hudi.common.fs.FSUtils; |
| import org.apache.hudi.common.util.Option; |
| import org.apache.hudi.common.util.collection.ImmutablePair; |
| import org.apache.hudi.common.util.collection.Pair; |
| import org.apache.hudi.exception.HoodieIOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.LocatedFileStatus; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.RemoteIterator; |
| import org.apache.log4j.LogManager; |
| import org.apache.log4j.Logger; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| public class DFSPathSelector { |
| |
| protected static volatile Logger log = LogManager.getLogger(DFSPathSelector.class); |
| |
| /** |
| * Configs supported. |
| */ |
| public static class Config { |
| |
| public static final String ROOT_INPUT_PATH_PROP = "hoodie.deltastreamer.source.dfs.root"; |
| public static final String SOURCE_INPUT_SELECTOR = "hoodie.deltastreamer.source.input.selector"; |
| } |
| |
| protected static final List<String> IGNORE_FILEPREFIX_LIST = Arrays.asList(".", "_"); |
| |
| protected final transient FileSystem fs; |
| protected final TypedProperties props; |
| |
| public DFSPathSelector(TypedProperties props, Configuration hadoopConf) { |
| DataSourceUtils.checkRequiredProperties(props, Arrays.asList(Config.ROOT_INPUT_PATH_PROP)); |
| this.props = props; |
| this.fs = FSUtils.getFs(props.getString(Config.ROOT_INPUT_PATH_PROP), hadoopConf); |
| } |
| |
| public Pair<Option<String>, String> getNextFilePathsAndMaxModificationTime(Option<String> lastCheckpointStr, |
| long sourceLimit) { |
| |
| try { |
| // obtain all eligible files under root folder. |
| log.info("Root path => " + props.getString(Config.ROOT_INPUT_PATH_PROP) + " source limit => " + sourceLimit); |
| List<FileStatus> eligibleFiles = new ArrayList<>(); |
| RemoteIterator<LocatedFileStatus> fitr = |
| fs.listFiles(new Path(props.getString(Config.ROOT_INPUT_PATH_PROP)), true); |
| while (fitr.hasNext()) { |
| LocatedFileStatus fileStatus = fitr.next(); |
| if (fileStatus.isDirectory() |
| || IGNORE_FILEPREFIX_LIST.stream().anyMatch(pfx -> fileStatus.getPath().getName().startsWith(pfx))) { |
| continue; |
| } |
| eligibleFiles.add(fileStatus); |
| } |
| // sort them by modification time. |
| eligibleFiles.sort(Comparator.comparingLong(FileStatus::getModificationTime)); |
| // Filter based on checkpoint & input size, if needed |
| long currentBytes = 0; |
| long maxModificationTime = Long.MIN_VALUE; |
| List<FileStatus> filteredFiles = new ArrayList<>(); |
| for (FileStatus f : eligibleFiles) { |
| if (lastCheckpointStr.isPresent() && f.getModificationTime() <= Long.valueOf(lastCheckpointStr.get()).longValue()) { |
| // skip processed files |
| continue; |
| } |
| |
| if (currentBytes + f.getLen() >= sourceLimit) { |
| // we have enough data, we are done |
| break; |
| } |
| |
| maxModificationTime = f.getModificationTime(); |
| currentBytes += f.getLen(); |
| filteredFiles.add(f); |
| } |
| |
| // no data to read |
| if (filteredFiles.size() == 0) { |
| return new ImmutablePair<>(Option.empty(), lastCheckpointStr.orElseGet(() -> String.valueOf(Long.MIN_VALUE))); |
| } |
| |
| // read the files out. |
| String pathStr = filteredFiles.stream().map(f -> f.getPath().toString()).collect(Collectors.joining(",")); |
| |
| return new ImmutablePair<>(Option.ofNullable(pathStr), String.valueOf(maxModificationTime)); |
| } catch (IOException ioe) { |
| throw new HoodieIOException("Unable to read from source from checkpoint: " + lastCheckpointStr, ioe); |
| } |
| } |
| } |