TextInputFormat.java
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上传日期:2018-01-08
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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://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.hadoop.mapreduce.lib.input;
- import org.apache.hadoop.fs.Path;
- import org.apache.hadoop.io.LongWritable;
- import org.apache.hadoop.io.Text;
- import org.apache.hadoop.io.compress.CompressionCodec;
- import org.apache.hadoop.io.compress.CompressionCodecFactory;
- import org.apache.hadoop.mapreduce.InputFormat;
- import org.apache.hadoop.mapreduce.InputSplit;
- import org.apache.hadoop.mapreduce.JobContext;
- import org.apache.hadoop.mapreduce.RecordReader;
- import org.apache.hadoop.mapreduce.TaskAttemptContext;
- /** An {@link InputFormat} for plain text files. Files are broken into lines.
- * Either linefeed or carriage-return are used to signal end of line. Keys are
- * the position in the file, and values are the line of text.. */
- public class TextInputFormat extends FileInputFormat<LongWritable, Text> {
- @Override
- public RecordReader<LongWritable, Text>
- createRecordReader(InputSplit split,
- TaskAttemptContext context) {
- return new LineRecordReader();
- }
- @Override
- protected boolean isSplitable(JobContext context, Path file) {
- CompressionCodec codec =
- new CompressionCodecFactory(context.getConfiguration()).getCodec(file);
- return codec == null;
- }
- }