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JobBuilderMapTInput, TOutput(IOperationInput, ActionTInput, RecordWriterTOutput, TaskContext, RecordReuseMode) Method

Runs a map function on each record in the input.

Namespace: Ookii.Jumbo.Jet.Jobs.Builder
Assembly: Ookii.Jumbo.Jet (in Ookii.Jumbo.Jet.dll) Version: 0.3.0+dc1307f20e065bb638e0b73a34cd216f57e486f1
Syntax
public StageOperation Map<TInput, TOutput>(
	IOperationInput input,
	Action<TInput, RecordWriter<TOutput>, TaskContext> mapper,
	RecordReuseMode recordReuse = RecordReuseMode.Default
)

Parameters

input  IOperationInput
The input.
mapper  ActionTInput, RecordWriterTOutput, TaskContext
The map function.
recordReuse  RecordReuseMode  (Optional)
The record reuse mode.

Type Parameters

TInput
The type of the input records.
TOutput
The type of the output records.

Return Value

StageOperation
A StageOperation instance that can be used to further customize the operation.
Remarks
Note  Note
There is no non-delegate version of this method. To use an existing map task class, simply use the Process(IOperationInput, Type) function.

This method generates a class inheriting from PushTaskTInput, TOutput which calls the target method of the mapper delegate from the ProcessRecord(TInput, RecordWriterTOutput) method.

Note  Note
The task method will be called from a completely different process than the one that is using JobBuilder, so it should not really on any external state.

If recordReuse is Default and the target method has the AllowRecordReuseAttribute attribute applied to it, that attribute will be copied to the task class. If the target method has the ProcessAllInputPartitionsAttribute attribute applied to it, that attribute will be copied to the task class.

The target method must be a public static method.

See Also