co.cask.cdap.etl.api.batch

Interface BatchJoinerContext

All Superinterfaces:

BatchContext, DatasetContext, LookupProvider, StageContext, TransformContext

@Beta
public interface BatchJoinerContext
extends BatchContext

Context of a Batch Joiner

Method Summary

Methods

Modifier and Type	Method and Description
void	setJoinInputRecordClass(Class<?> joinInputRecordClass) Set the join input record class.
void	setJoinKeyClass(Class<?> joinKeyClass) Set the join key class.
void	setNumPartitions(int numPartitions) Set the number of partitions to use to join values.

Methods inherited from interface co.cask.cdap.etl.api.batch.BatchContext

createDataset, datasetExists, getHadoopJob, getLogicalStartTime, getRuntimeArguments, setRuntimeArgument

Methods inherited from interface co.cask.cdap.api.data.DatasetContext

discardDataset, getDataset, getDataset, getDataset, getDataset, releaseDataset

Methods inherited from interface co.cask.cdap.etl.api.StageContext

getMetrics, getPluginProperties, getPluginProperties, getStageName, loadPluginClass, newPluginInstance

Methods inherited from interface co.cask.cdap.etl.api.LookupProvider

provide

Method Detail

setNumPartitions

void setNumPartitions(int numPartitions)

Set the number of partitions to use to join values. If none is set, the execution engine will decide how many partitions to use.

Parameters:

numPartitions - the number of partitions to use when joining.

setJoinKeyClass

void setJoinKeyClass(Class<?> joinKeyClass)

Set the join key class. This is not required if the joiner is parameterized with a concrete class for the join key. This method is required if the join key class is only known at configure time versus compile time. For example, an joiner may support joining on a configurable record field, and not know the type of that field until configure time.

Parameters:

joinKeyClass - the join key class

setJoinInputRecordClass

void setJoinInputRecordClass(Class<?> joinInputRecordClass)

Set the join input record class. This is not required if the joiner is parameterized with a concrete class for the join input. This method is required if the input record class is only known at configure time versus compile time.

Parameters:

joinInputRecordClass - the join input record class