Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/1929#discussion_r60928614
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/functions/source/FileSplitMonitoringFunction.java
---
@@ -0,0 +1,259 @@
+/*
+ * 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.flink.streaming.api.functions.source;
+
+import org.apache.flink.api.common.io.FileInputFormat;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.fs.FileInputSplit;
+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.runtime.JobException;
+import org.apache.flink.util.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * This is the single (non-parallel) task, that monitors a user-procided
path, and assigns splits
+ * to downstream tasks for further reading and processing, depending on
the user-provided {@link FileSplitMonitoringFunction.WatchType}.
+ *
+ * This method keeps track of which splits have already being processed by
which task, and at which point
+ * in the file we are currently processing, at the granularity of the
split. In addition, it keeps track
+ * of the last modification time for each file, so that it can detect new
data.
+ */
+public class FileSplitMonitoringFunction<OUT>
+ extends RichSourceFunction<FileInputSplit> {
+
+ private static final long serialVersionUID = 1L;
+
+ private static final Logger LOG =
LoggerFactory.getLogger(FileSplitMonitoringFunction.class);
+
+ /**
+ * Specifies when computation will be triggered. This can be currently
done in 3 ways.
+ * <li/>{@code ONLY_NEW_FILES} which implies that only new files will
be processed.
+ * <li/>{@code REPROCESS_WITH_APPENDED} which reprocesses the whole
file, as soon as new data is appended to it.
+ */
+ public enum WatchType {
--- End diff --
where is ONLY_NEW_FILES ?
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