org.apache.avro.mapred.AvroAsTextInputFormat Maven / Gradle / Ivy
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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
*
* 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.
*/
package org.apache.avro.mapred;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
/**
* An {@link org.apache.hadoop.mapred.InputFormat} for Avro data files, which
* converts each datum to string form in the input key. The input value is
* always empty. The string representation is
* JSON.
*
* This {@link org.apache.hadoop.mapred.InputFormat} is useful for applications
* that wish to process Avro data using tools like MapReduce Streaming.
*
* By default, when pointed at a directory, this will silently skip over any
* files in it that do not have .avro extension. To instead include all files,
* set the avro.mapred.ignore.inputs.without.extension property to false.
*/
public class AvroAsTextInputFormat extends FileInputFormat {
@Override
protected FileStatus[] listStatus(JobConf job) throws IOException {
if (job.getBoolean(AvroInputFormat.IGNORE_FILES_WITHOUT_EXTENSION_KEY,
AvroInputFormat.IGNORE_INPUTS_WITHOUT_EXTENSION_DEFAULT)) {
List result = new ArrayList<>();
for (FileStatus file : super.listStatus(job))
if (file.getPath().getName().endsWith(AvroOutputFormat.EXT))
result.add(file);
return result.toArray(new FileStatus[0]);
} else {
return super.listStatus(job);
}
}
@Override
public RecordReader getRecordReader(InputSplit split, JobConf job, Reporter reporter) throws IOException {
reporter.setStatus(split.toString());
return new AvroAsTextRecordReader(job, (FileSplit) split);
}
}