org.apache.hadoop.hbase.mapred

类 TableRecordReader

java.lang.Object

org.apache.hadoop.hbase.mapred.TableRecordReader

所有已实现的接口:

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

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

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

构造器概要

构造器

构造器和说明
TableRecordReader()

方法概要

方法

限定符和类型	方法和说明
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)

从类继承的方法 java.lang.Object

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

构造器详细资料

TableRecordReader

public TableRecordReader()

方法详细资料

restart

public void restart(byte[] firstRow)
             throws IOException

Restart from survivable exceptions by creating a new scanner.

参数:

firstRow -

抛出:

IOException

init

public void init()
          throws IOException

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

抛出:

IOException

setHTable

public void setHTable(Table htable)

参数:

htable - the HTableDescriptor to scan.

setInputColumns

public void setInputColumns(byte[][] inputColumns)

参数:

inputColumns - the columns to be placed in Result.

setStartRow

public void setStartRow(byte[] startRow)

参数:

startRow - the first row in the split

setEndRow

public void setEndRow(byte[] endRow)

参数:

endRow - the last row in the split

setRowFilter

public void setRowFilter(Filter rowFilter)

参数:

rowFilter - the Filter to be used.

close

public void close()

指定者:

close 在接口中 org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

createKey

public ImmutableBytesWritable createKey()

指定者:

createKey 在接口中 org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

返回:

ImmutableBytesWritable

另请参阅:

RecordReader.createKey()

createValue

public Result createValue()

指定者:

createValue 在接口中 org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

返回:

RowResult

另请参阅:

RecordReader.createValue()

getPos

public long getPos()

指定者:

getPos 在接口中 org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

getProgress

public float getProgress()

指定者:

getProgress 在接口中 org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

next

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

指定者:

next 在接口中 org.apache.hadoop.mapred.RecordReader<ImmutableBytesWritable,Result>

参数:

key - HStoreKey as input key.

value - MapWritable as input value

返回:

true if there was more data

抛出:

IOException