Package org.apache.accumulo.core.client.mapred

Class AccumuloMultiTableInputFormat

java.lang.Object

org.apache.accumulo.core.client.mapred.AbstractInputFormat<Key,Value>

org.apache.accumulo.core.client.mapred.AccumuloMultiTableInputFormat

All Implemented Interfaces:

org.apache.hadoop.mapred.InputFormat<Key,Value>

public class AccumuloMultiTableInputFormat
extends AbstractInputFormat<Key,Value>

This class allows MapReduce jobs to use multiple Accumulo tables as the source of data. This InputFormat provides keys and values of type Key and Value to the Map function. The user must specify the following via static configurator methods:

• AbstractInputFormat.setConnectorInfo(JobConf, String, org.apache.accumulo.core.client.security.tokens.AuthenticationToken)
• AbstractInputFormat.setConnectorInfo(JobConf, String, String)
• AbstractInputFormat.setScanAuthorizations(JobConf, org.apache.accumulo.core.security.Authorizations)
• AbstractInputFormat.setZooKeeperInstance(JobConf, ClientConfiguration)
• setInputTableConfigs(org.apache.hadoop.mapred.JobConf, java.util.Map)

Other static methods are optional.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.client.mapred.AbstractInputFormat

AbstractInputFormat.AbstractRecordReader<K,V>

Field Summary

Fields inherited from class org.apache.accumulo.core.client.mapred.AbstractInputFormat

CLASS, log

Constructor Summary

Constructors

Constructor	Description
AccumuloMultiTableInputFormat()

Method Summary

Modifier and Type	Method	Description
org.apache.hadoop.mapred.RecordReader<Key,Value>	getRecordReader(org.apache.hadoop.mapred.InputSplit split, org.apache.hadoop.mapred.JobConf job, org.apache.hadoop.mapred.Reporter reporter)
static void	setInputTableConfigs(org.apache.hadoop.mapred.JobConf job, Map<String,InputTableConfig> configs)	Sets the InputTableConfig objects on the given Hadoop configuration

Methods inherited from class org.apache.accumulo.core.client.mapred.AbstractInputFormat

getAuthenticationToken, getClassLoaderContext, getClientConfiguration, getInputTableConfig, getInputTableConfigs, getInstance, getLogLevel, getPrincipal, getScanAuthorizations, getSplits, getTabletLocator, isConnectorInfoSet, setClassLoaderContext, setConnectorInfo, setConnectorInfo, setLogLevel, setMockInstance, setScanAuthorizations, setZooKeeperInstance, setZooKeeperInstance, validateOptions

Methods inherited from class java.lang.Object

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

Constructor Details

AccumuloMultiTableInputFormat

public AccumuloMultiTableInputFormat()

Method Details

setInputTableConfigs

public static void setInputTableConfigs(org.apache.hadoop.mapred.JobConf job,
 Map<String,InputTableConfig> configs)

Sets the InputTableConfig objects on the given Hadoop configuration

Parameters:

job - the Hadoop job instance to be configured

configs - the table query configs to be set on the configuration.

Since:

1.6.0

getRecordReader

public org.apache.hadoop.mapred.RecordReader<Key,Value> getRecordReader(org.apache.hadoop.mapred.InputSplit split,
 org.apache.hadoop.mapred.JobConf job,
 org.apache.hadoop.mapred.Reporter reporter)
                                                                 throws IOException

Throws:

IOException