MultiTableInputFormat (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.mapreduce.InputFormat<ImmutableBytesWritable,Result>
- - org.apache.hadoop.hbase.mapreduce.MultiTableInputFormatBase
  - - org.apache.hadoop.hbase.mapreduce.MultiTableInputFormat

All Implemented Interfaces:: org.apache.hadoop.conf.Configurable

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class MultiTableInputFormat
extends MultiTableInputFormatBase
implements org.apache.hadoop.conf.Configurable

Convert HBase tabular data from multiple scanners into a format that is consumable by Map/Reduce.

Usage example

 List<Scan> scans = new ArrayList<Scan>();
 
 Scan scan1 = new Scan();
 scan1.setStartRow(firstRow1);
 scan1.setStopRow(lastRow1);
 scan1.setAttribute(Scan.SCAN_ATTRIBUTES_TABLE_NAME, table1);
 scans.add(scan1);

 Scan scan2 = new Scan();
 scan2.setStartRow(firstRow2);
 scan2.setStopRow(lastRow2);
 scan1.setAttribute(Scan.SCAN_ATTRIBUTES_TABLE_NAME, table2);
 scans.add(scan2);

 TableMapReduceUtil.initTableMapperJob(scans, TableMapper.class, Text.class,
     IntWritable.class, job);

Field Summary

Fields
Modifier and Type Field and Description

private org.apache.hadoop.conf.Configuration conf
The configuration.

static String SCANS
Job parameter that specifies the scan list.

Fields
Modifier and Type	Field and Description
`private org.apache.hadoop.conf.Configuration`	`conf` The configuration.
`static String`	`SCANS` Job parameter that specifies the scan list.

Constructor Summary

Constructors
Constructor and Description

MultiTableInputFormat()

Constructors
Constructor and Description
`MultiTableInputFormat()`

Method Summary

Methods
Modifier and Type	Method and Description
`org.apache.hadoop.conf.Configuration`	`getConf()` Returns the current configuration.
`void`	`setConf(org.apache.hadoop.conf.Configuration configuration)` Sets the configuration.

Methods inherited from class org.apache.hadoop.hbase.mapreduce.MultiTableInputFormatBase
createRecordReader, getScans, getSplits, includeRegionInSplit, setScans, setTableRecordReader

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - SCANS
```
public static final String SCANS
```
    Job parameter that specifies the scan list.
    
    See Also:
    Constant Field Values
  - conf
```
private org.apache.hadoop.conf.Configuration conf
```
    The configuration.
- Constructor Detail
  - MultiTableInputFormat
```
public MultiTableInputFormat()
```
- Method Detail
  - getConf
```
public org.apache.hadoop.conf.Configuration getConf()
```
    Returns the current configuration.
    
    Specified by:
    
    getConf in interface org.apache.hadoop.conf.Configurable
    
    Returns:
    The current configuration.
    See Also:
    Configurable.getConf()
  - setConf
```
public void setConf(org.apache.hadoop.conf.Configuration configuration)
```
    Sets the configuration. This is used to set the details for the tables to be scanned.
    
    Specified by:
    
    setConf in interface org.apache.hadoop.conf.Configurable
    
    Parameters:
    configuration - The configuration to set.
    See Also:
    Configurable.setConf( org.apache.hadoop.conf.Configuration)

Class MultiTableInputFormat

Field Summary

Constructor Summary

Method Summary

Methods inherited from class org.apache.hadoop.hbase.mapreduce.MultiTableInputFormatBase

Methods inherited from class java.lang.Object

Field Detail

SCANS

conf

Constructor Detail

MultiTableInputFormat

Method Detail

getConf

setConf