org.apache.trevni.avro.mapreduce

Class AvroTrevniRecordReaderBase<K,V,T>

java.lang.Object

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

org.apache.trevni.avro.mapreduce.AvroTrevniRecordReaderBase<K,V,T>

Type Parameters:

K - The type of key the record reader should generate.

V - The type of value the record reader should generate.

T - The type of the entries within the Trevni container file being read.

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

AvroTrevniKeyRecordReader, AvroTrevniKeyValueRecordReader

public abstract class AvroTrevniRecordReaderBase<K,V,T>
extends org.apache.hadoop.mapreduce.RecordReader<K,V>

Abstract base class for RecordReaders that read Trevni container files.

Constructor Summary

Constructors

Constructor and Description
AvroTrevniRecordReaderBase()

Method Summary

Modifier and Type	Method and Description
void	close()
protected T	getCurrentRecord() Gets the current record read from the Trevni container file.
float	getProgress()
void	initialize(org.apache.hadoop.mapreduce.InputSplit inputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext context)
boolean	nextKeyValue()

Methods inherited from class org.apache.hadoop.mapreduce.RecordReader

getCurrentKey, getCurrentValue

Methods inherited from class java.lang.Object

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

Constructor Detail

AvroTrevniRecordReaderBase

public AvroTrevniRecordReaderBase()

Method Detail

initialize

public void initialize(org.apache.hadoop.mapreduce.InputSplit inputSplit,
                       org.apache.hadoop.mapreduce.TaskAttemptContext context)
                throws IOException,
                       InterruptedException

Specified by:

initialize in class org.apache.hadoop.mapreduce.RecordReader<K,V>

Throws:

IOException

InterruptedException

nextKeyValue

public boolean nextKeyValue()
                     throws IOException,
                            InterruptedException

Specified by:

nextKeyValue in class org.apache.hadoop.mapreduce.RecordReader<K,V>

Throws:

IOException

InterruptedException

getCurrentRecord

protected T getCurrentRecord()

Gets the current record read from the Trevni container file.

Calling nextKeyValue() moves this to the next record.

Returns:

The current Trevni record (may be null if no record has been read).

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class org.apache.hadoop.mapreduce.RecordReader<K,V>

Throws:

IOException

getProgress

public float getProgress()
                  throws IOException,
                         InterruptedException

Specified by:

getProgress in class org.apache.hadoop.mapreduce.RecordReader<K,V>

Throws:

IOException

InterruptedException