Github user sandeepdeshmukh commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/207#discussion_r55633512
--- Diff:
library/src/main/java/com/datatorrent/lib/io/fs/HDFSInputModule.java ---
@@ -0,0 +1,236 @@
+/**
+ * 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 com.datatorrent.lib.io.fs;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
+
+import org.apache.commons.lang.mutable.MutableLong;
+import org.apache.hadoop.conf.Configuration;
+
+import com.datatorrent.api.Context;
+import com.datatorrent.api.DAG;
+import com.datatorrent.api.Module;
+import com.datatorrent.common.metric.MetricsAggregator;
+import com.datatorrent.common.metric.SingleMetricAggregator;
+import com.datatorrent.common.metric.sum.LongSumAggregator;
+import com.datatorrent.common.partitioner.StatelessPartitioner;
+import com.datatorrent.lib.counters.BasicCounters;
+import com.datatorrent.lib.io.block.AbstractBlockReader.ReaderRecord;
+import com.datatorrent.lib.io.block.BlockMetadata.FileBlockMetadata;
+import com.datatorrent.lib.io.block.HDFSBlockReader;
+import com.datatorrent.lib.io.fs.AbstractFileSplitter.FileMetadata;
+import com.datatorrent.lib.io.fs.HDFSFileSplitter.HDFSScanner;
+import com.datatorrent.netlet.util.Slice;
+
+/**
+ * HDFSInputModule is used to read files from HDFS. <br/>
+ * Module emits FileMetadata, BlockMetadata and the block bytes.
+ */
+public class HDFSInputModule implements Module
+{
+
+ @NotNull
+ @Size(min = 1)
+ private String files;
--- End diff --
The purpose of Modules is to ease configuration of operators and hence it
is good to separate host, port, directory etc.
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