org.apache.avro.mapreduce

Class AvroKeyOutputFormat<T>

java.lang.Object

org.apache.hadoop.mapreduce.OutputFormat<K,V>

org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<K,V>

org.apache.avro.mapreduce.AvroOutputFormatBase<AvroKey<T>,org.apache.hadoop.io.NullWritable>

org.apache.avro.mapreduce.AvroKeyOutputFormat<T>

Type Parameters:

T - The (java) type of the Avro data to write.

public class AvroKeyOutputFormat<T>
extends AvroOutputFormatBase<AvroKey<T>,org.apache.hadoop.io.NullWritable>

FileOutputFormat for writing Avro container files.

Since Avro container files only contain records (not key/value pairs), this output format ignores the value.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	AvroKeyOutputFormat.RecordWriterFactory<T> A factory for creating record writers.

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.Counter

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

BASE_OUTPUT_NAME, COMPRESS, COMPRESS_CODEC, COMPRESS_TYPE, OUTDIR, PART

Constructor Summary

Constructors

Modifier	Constructor and Description
	AvroKeyOutputFormat() Constructor.
protected	AvroKeyOutputFormat(AvroKeyOutputFormat.RecordWriterFactory recordWriterFactory) Constructor.

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.mapreduce.RecordWriter<AvroKey<T>,org.apache.hadoop.io.NullWritable>	getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext context)

Methods inherited from class org.apache.avro.mapreduce.AvroOutputFormatBase

getAvroFileOutputStream, getCompressionCodec, getSyncInterval

Methods inherited from class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat

checkOutputSpecs, getCompressOutput, getDefaultWorkFile, getOutputCommitter, getOutputCompressorClass, getOutputName, getOutputPath, getPathForWorkFile, getUniqueFile, getWorkOutputPath, setCompressOutput, setOutputCompressorClass, setOutputName, setOutputPath

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AvroKeyOutputFormat

public AvroKeyOutputFormat()

Constructor.

AvroKeyOutputFormat

protected AvroKeyOutputFormat(AvroKeyOutputFormat.RecordWriterFactory recordWriterFactory)

Constructor.

Parameters:

recordWriterFactory - A factory for creating record writers.

Method Detail

getRecordWriter

public org.apache.hadoop.mapreduce.RecordWriter<AvroKey<T>,org.apache.hadoop.io.NullWritable> getRecordWriter(org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                                                                       throws IOException

Specified by:

getRecordWriter in class org.apache.hadoop.mapreduce.lib.output.FileOutputFormat<AvroKey<T>,org.apache.hadoop.io.NullWritable>

Throws:

IOException