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[FLINK-1081] Add HDFS file-stream source for streaming
Conflicts: flink-addons/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.java
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.../src/main/java/org/apache/flink/streaming/api/function/source/FileMonitoringFunction.java
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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:https://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.flink.streaming.api.function.source; | ||
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| import java.io.IOException; | ||
| import java.net.URI; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import org.apache.flink.api.java.tuple.Tuple3; | ||
| import org.apache.flink.core.fs.FileStatus; | ||
| import org.apache.flink.core.fs.FileSystem; | ||
| import org.apache.flink.core.fs.Path; | ||
| import org.apache.flink.util.Collector; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| public class FileMonitoringFunction implements SourceFunction<Tuple3<String, Long, Long>> { | ||
| private static final long serialVersionUID = 1L; | ||
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| private static final Logger LOG = LoggerFactory.getLogger(FileMonitoringFunction.class); | ||
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| public enum WatchType { | ||
| ONLY_NEW_FILES, // Only new files will be processed. | ||
| REPROCESS_WITH_APPENDED, // When some files are appended, all contents of the files will be processed. | ||
| PROCESS_ONLY_APPENDED // When some files are appended, only appended contents will be processed. | ||
| } | ||
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| private String path; | ||
| private long interval; | ||
| private WatchType watchType; | ||
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| private FileSystem fileSystem; | ||
| private long lastModificationTime; | ||
| private Map<String, Long> offsetOfFiles; | ||
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| public FileMonitoringFunction(String path, long interval, WatchType watchType) { | ||
| this.path = path; | ||
| this.interval = interval; | ||
| this.watchType = watchType; | ||
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| this.lastModificationTime = System.currentTimeMillis(); | ||
| this.offsetOfFiles = new HashMap<String, Long>(); | ||
| } | ||
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| @Override | ||
| public void invoke(Collector<Tuple3<String, Long, Long>> collector) throws Exception { | ||
| fileSystem = FileSystem.get(new URI(path)); | ||
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| while (true) { | ||
| List<String> files = listNewFiles(); | ||
| for (String filePath : files) { | ||
| if (watchType == WatchType.ONLY_NEW_FILES || watchType == WatchType.REPROCESS_WITH_APPENDED) { | ||
| collector.collect(new Tuple3<String, Long, Long>(filePath, 0L, -1L)); | ||
| offsetOfFiles.put(filePath, -1L); | ||
| } else if (watchType == WatchType.PROCESS_ONLY_APPENDED) { | ||
| long offset = 0; | ||
| long fileSize = fileSystem.getFileStatus(new Path(filePath)).getLen(); | ||
| if (offsetOfFiles.containsKey(filePath)) { | ||
| offset = offsetOfFiles.get(filePath); | ||
| } | ||
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| collector.collect(new Tuple3<String, Long, Long>(filePath, offset, fileSize)); | ||
| offsetOfFiles.put(filePath, fileSize); | ||
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| LOG.info("File processed: {}, {}, {}", filePath, offset, fileSize); | ||
| } | ||
| } | ||
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| Thread.sleep(interval); | ||
| } | ||
| } | ||
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| private List<String> listNewFiles() throws IOException { | ||
| List<String> files = new ArrayList<String>(); | ||
| FileStatus[] statuses = fileSystem.listStatus(new Path(path)); | ||
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| for (FileStatus status : statuses) { | ||
| Path filePath = status.getPath(); | ||
| long modificationTime = status.getModificationTime(); | ||
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| if (!isFiltered(filePath, modificationTime)) { | ||
| files.add(filePath.toString()); | ||
| } | ||
| } | ||
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| lastModificationTime = System.currentTimeMillis(); | ||
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| return files; | ||
| } | ||
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| private boolean isFiltered(Path path, long modificationTime) { | ||
| String filename = path.getName(); | ||
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| return lastModificationTime > modificationTime // not modified file | ||
| || (watchType == WatchType.ONLY_NEW_FILES && offsetOfFiles.containsKey(path.toString())) // modified file but already processed | ||
| || filename.startsWith(".") // hidden file | ||
| || filename.contains("_COPYING_"); // currently copying file | ||
| } | ||
| } |
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