oracle.kv.hadoop.table

Class TableRecordReader

java.lang.Object

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

oracle.kv.hadoop.table.TableRecordReader

All Implemented Interfaces:

Closeable

public class TableRecordReader
extends RecordReader<K,V>

Concrete implementation of TableRecordReaderBase that reads table rows from an InputSplit using a PrimaryKey.

Since:

3.1

Field Summary

Fields

Modifier and Type	Field and Description
protected Row	current

Constructor Summary

Constructors

Constructor and Description
TableRecordReader()

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close the record reader.
PrimaryKey	getCurrentKey() Get the current key.
Row	getCurrentValue() Get the current value.
float	getProgress() The current progress of the record reader through its data.
void	initialize(InputSplit split, TaskAttemptContext context) Called once at initialization.
boolean	nextKeyValue() Read the next row.

Methods inherited from class java.lang.Object

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

Field Detail

current

protected Row current

Constructor Detail

TableRecordReader

public TableRecordReader()

Method Detail

getCurrentKey

public PrimaryKey getCurrentKey()
                         throws IOException,
                                InterruptedException

Get the current key.

Specified by:

getCurrentKey in class RecordReader<PrimaryKey,Row>

Returns:

the current key or null if there is no current key

Throws:

IOException

InterruptedException

getCurrentValue

public Row getCurrentValue()
                    throws IOException,
                           InterruptedException

Get the current value.

Specified by:

getCurrentValue in class RecordReader<PrimaryKey,Row>

Returns:

the object that was read

Throws:

IOException

InterruptedException

initialize

public void initialize(InputSplit split,
              TaskAttemptContext context)
                throws IOException,
                       InterruptedException

Called once at initialization.

Specified by:

initialize in class RecordReader<K,V>

Parameters:

split - the split that defines the range of records to read

context - the information about the task

Throws:

IOException

InterruptedException

nextKeyValue

public boolean nextKeyValue()

Read the next row.

Specified by:

nextKeyValue in class RecordReader<K,V>

Returns:

true if a key/value pair was read

getProgress

public float getProgress()

The current progress of the record reader through its data.

Specified by:

getProgress in class RecordReader<K,V>

Returns:

a number between 0.0 and 1.0 that is the fraction of the data read

close

public void close()
           throws IOException

Close the record reader.

Specified by:

close in interface Closeable

Specified by:

close in class RecordReader<K,V>

Throws:

IOException