Github user yogidevendra commented on a diff in the pull request: https://github.com/apache/apex-malhar/pull/326#discussion_r70930388 --- Diff: library/src/main/java/org/apache/apex/malhar/lib/fs/FSRecordReaderModule.java --- @@ -0,0 +1,344 @@ +/** + * 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.apex.malhar.lib.fs; + +import javax.validation.constraints.Min; + +import javax.validation.constraints.NotNull; +import javax.validation.constraints.Size; + +import org.apache.apex.malhar.lib.fs.FSRecordReader.RECORD_READER_MODE; +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.partitioner.StatelessPartitioner; +import com.datatorrent.lib.codec.KryoSerializableStreamCodec; +import com.datatorrent.lib.io.block.BlockMetadata; +import com.datatorrent.lib.io.block.FSSliceReader; +import com.datatorrent.lib.io.fs.FileSplitterInput; + +/** + * This module is used for reading records/tuples from FileSystem. Records can + * be read in parallel using multiple partitions of record reader operator. + * (Ordering is not guaranteed when records are read in parallel) + * + * Input directory is scanned at specified interval to poll for new data. + * + * The module reads data in parallel, following parameters can be configured + * <br/> + * 1. files: list of file(s)/directories to read<br/> + * 2. filePatternRegularExp: Files with names matching given regex will be read<br/> + * 3. scanIntervalMillis: interval between two scans to discover new files in + * input directory<br/> + * 4. recursive: if true, scan input directories recursively<br/> + * 5. blockSize: block size used to read input blocks of file<br/> + * 6. readersCount: count of readers to read input file<br/> + * 7. sequentialFileRead: if true, then each reader partition will read different file. <br/> + * instead of reading different offsets of the same file. <br/> + * (File level parallelism instead of block level parallelism)<br/> + * 8. blocksThreshold: number of blocks emitted per window + */ +@org.apache.hadoop.classification.InterfaceStability.Evolving +public class FSRecordReaderModule implements Module +{ + @NotNull + @Size(min = 1) + private String files; + private String filePatternRegularExp; + @Min(1) + private long scanIntervalMillis = 5000; + private boolean recursive = true; + private boolean sequentialFileRead = false; + @Min(1) + private int readersCount = 1; + @Min(1) + protected int blocksThreshold = 1; + + public final transient ProxyOutputPort<byte[]> records = new ProxyOutputPort<byte[]>(); + + /** + * Criteria for record split + */ + private RECORD_READER_MODE mode = RECORD_READER_MODE.DELIMITED_RECORD; + + /** + * Length for fixed width record + */ + @Min(1) + private int recordLength; --- End diff -- Oh. Good point. Should we separate this into two different classes. FixedWidthRecordReader, DelimitedRecordReader? That will make configuration clean. @amberarrow Any thoughts?
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