org.apache.hadoop.hbase.mapred

Class TableRecordReader

java.lang.Object

org.apache.hadoop.hbase.mapred.TableRecordReader

All Implemented Interfaces:

org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

@InterfaceAudience.Public
public class TableRecordReader
extends Object
implements org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

Iterate over an HBase table data, return (Text, RowResult) pairs

Constructor Summary

Constructors

Constructor and Description
TableRecordReader()

Method Summary

Modifier and Type	Method and Description
void	close()
ImmutableBytesWritable	createKey()
Result	createValue()
long	getPos()
float	getProgress()
void	init() Build the scanner.
boolean	next(ImmutableBytesWritable key, Result value)
void	restart(byte[] firstRow) Restart from survivable exceptions by creating a new scanner.
void	setEndRow(byte[] endRow)
void	setHTable(Table htable)
void	setInputColumns(byte[][] inputColumns)
void	setRowFilter(Filter rowFilter)
void	setStartRow(byte[] startRow)

Methods inherited from class java.lang.Object

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

Constructor Detail

TableRecordReader

public TableRecordReader()

Method Detail

restart

public void restart(byte[] firstRow)
             throws IOException

Restart from survivable exceptions by creating a new scanner.

Parameters:

firstRow -

Throws:

IOException

init

public void init()
          throws IOException

Build the scanner. Not done in constructor to allow for extension.

Throws:

IOException

setHTable

public void setHTable(Table htable)

Parameters:

htable - the HTableDescriptor to scan.

setInputColumns

public void setInputColumns(byte[][] inputColumns)

Parameters:

inputColumns - the columns to be placed in Result.

setStartRow

public void setStartRow(byte[] startRow)

Parameters:

startRow - the first row in the split

setEndRow

public void setEndRow(byte[] endRow)

Parameters:

endRow - the last row in the split

setRowFilter

public void setRowFilter(Filter rowFilter)

Parameters:

rowFilter - the Filter to be used.

close

public void close()

Specified by:

close in interface org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

createKey

public ImmutableBytesWritable createKey()

Specified by:

createKey in interface org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

Returns:

ImmutableBytesWritable

See Also:

RecordReader.createKey()

createValue

public Result createValue()

Specified by:

createValue in interface org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

Returns:

RowResult

See Also:

RecordReader.createValue()

getPos

public long getPos()

Specified by:

getPos in interface org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

getProgress

public float getProgress()

Specified by:

getProgress in interface org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

next

public boolean next(ImmutableBytesWritable key,
                    Result value)
             throws IOException

Specified by:

next in interface org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

Parameters:

key - HStoreKey as input key.

value - MapWritable as input value

Returns:

true if there was more data

Throws:

IOException