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

java.lang.Object
  org.apache.accumulo.core.client.mapred.InputFormatBase.RecordReaderBase<K,V>

All Implemented Interfaces:

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

Enclosing class:

InputFormatBase<K,V>

protected abstract static class InputFormatBase.RecordReaderBase<K,V>
extends Object
implements org.apache.hadoop.mapred.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.next(Object, Object) to update key and value, and also to update the following variables:

• Key currentKey (used for progress reporting)
• int numKeysRead (used for progress reporting)

Field Summary

protected Key	currentKey
protected long	numKeysRead
protected Iterator<Map.Entry<Key,Value>>	scannerIterator
protected InputFormatBase.RangeInputSplit	split

Constructor Summary

protected

InputFormatBase.RecordReaderBase()

Method Summary

void	close()
long	getPos()
float	getProgress()
void	initialize(org.apache.hadoop.mapred.InputSplit inSplit, org.apache.hadoop.mapred.JobConf job) Initialize a scanner over the given input split using this task attempt configuration.
protected void	setupIterators(org.apache.hadoop.mapred.JobConf job, Scanner scanner) Apply the configured iterators from the configuration to the scanner.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.mapred.RecordReader

createKey, createValue, next

Field Detail

numKeysRead

protected long numKeysRead

scannerIterator

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

split

protected InputFormatBase.RangeInputSplit split

currentKey

protected Key currentKey

Constructor Detail

InputFormatBase.RecordReaderBase

protected InputFormatBase.RecordReaderBase()

Method Detail

setupIterators

protected void setupIterators(org.apache.hadoop.mapred.JobConf job,
                              Scanner scanner)

Apply the configured iterators from the configuration to the scanner.

Parameters:

job - the Hadoop context for the configured job

scanner - the scanner to configure

initialize

public void initialize(org.apache.hadoop.mapred.InputSplit inSplit,
                       org.apache.hadoop.mapred.JobConf job)
                throws IOException

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

Throws:

IOException

close

public void close()

Specified by:

close in interface org.apache.hadoop.mapred.RecordReader<K,V>

getPos

public long getPos()
            throws IOException

Specified by:

getPos in interface org.apache.hadoop.mapred.RecordReader<K,V>

Throws:

IOException

getProgress

public float getProgress()
                  throws IOException

Specified by:

getProgress in interface org.apache.hadoop.mapred.RecordReader<K,V>

Throws:

IOException