org.apache.accumulo.core.client.mapreduce

Class InputFormatBase.RecordReaderBase<K,V>

java.lang.Object

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

org.apache.accumulo.core.client.mapreduce.InputFormatBase.RecordReaderBase<K,V>

All Implemented Interfaces:

Closeable

Enclosing class:

InputFormatBase<K,V>

protected abstract static class InputFormatBase.RecordReaderBase<K,V>
extends org.apache.hadoop.mapreduce.RecordReader<K,V>

An abstract base class to be used to create RecordReader instances that convert from Accumulo Key/Value pairs to the user's K/V types. Subclasses must implement RecordReader.nextKeyValue() and use it to update the following variables:

• K currentK
• V currentV
• Key currentKey (used for progress reporting)
• int numKeysRead (used for progress reporting)

Field Summary

Fields

Modifier and Type	Field and Description
protected K	currentK
protected Key	currentKey
protected V	currentV
protected Value	currentValue
protected long	numKeysRead
protected Iterator<Map.Entry<Key,Value>>	scannerIterator
protected RangeInputSplit	split

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	InputFormatBase.RecordReaderBase()

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
K	getCurrentKey()
V	getCurrentValue()
float	getProgress()
void	initialize(org.apache.hadoop.mapreduce.InputSplit inSplit, org.apache.hadoop.mapreduce.TaskAttemptContext attempt) Initialize a scanner over the given input split using this task attempt configuration.
protected void	setupIterators(List<IteratorSetting> iterators, Scanner scanner) Apply the configured iterators from the configuration to the scanner.

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

nextKeyValue

Methods inherited from class java.lang.Object

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

Field Detail

numKeysRead

protected long numKeysRead

scannerIterator

protected Iterator<Map.Entry<Key,Value>> scannerIterator

split

protected RangeInputSplit split

currentK

protected K currentK

currentV

protected V currentV

currentKey

protected Key currentKey

currentValue

protected Value currentValue

Constructor Detail

InputFormatBase.RecordReaderBase

protected InputFormatBase.RecordReaderBase()

Method Detail

setupIterators

protected void setupIterators(List<IteratorSetting> iterators,
                  Scanner scanner)

Apply the configured iterators from the configuration to the scanner.

Parameters:

scanner - the scanner to configure

initialize

public void initialize(org.apache.hadoop.mapreduce.InputSplit inSplit,
              org.apache.hadoop.mapreduce.TaskAttemptContext attempt)
                throws IOException

Initialize a scanner over the given input split using this task attempt configuration.

Specified by:

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

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable

Specified by:

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

getProgress

public float getProgress()
                  throws IOException

Specified by:

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

Throws:

IOException

getCurrentKey

public K getCurrentKey()
                throws IOException,
                       InterruptedException

Specified by:

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

Throws:

IOException

InterruptedException

getCurrentValue

public V getCurrentValue()
                  throws IOException,
                         InterruptedException

Specified by:

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

Throws:

IOException

InterruptedException