MultiTableInputFormat (Apache HBase 1.4.11 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

static String SCANS
Job parameter that specifies the scan list.

Fields
Modifier and Type	Field and Description
`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
- 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

Constructor Detail

MultiTableInputFormat

Method Detail

getConf

setConf