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org.apache.crunch.lib
Class Sample.SamplerFn<S>

java.lang.Object
  org.apache.crunch.DoFn<S,S>
      org.apache.crunch.lib.Sample.SamplerFn<S>

All Implemented Interfaces:

Serializable

Enclosing class:

Sample

public static class Sample.SamplerFn<S>
extends DoFn<S,S>

See Also:

Serialized Form

Constructor Summary

Sample.SamplerFn(long seed, double acceptanceProbability)

Method Summary

void	initialize() Called during the setup of the MapReduce job this DoFn is associated with.
void	process(S input, Emitter<S> emitter) Processes the records from a PCollection.

Methods inherited from class org.apache.crunch.DoFn

cleanup, configure, scaleFactor, setConfigurationForTest, setContext

Methods inherited from class java.lang.Object

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

Constructor Detail

Sample.SamplerFn

public Sample.SamplerFn(long seed,
                        double acceptanceProbability)

Method Detail

initialize

public void initialize()

Description copied from class: DoFn

Called during the setup of the MapReduce job this DoFn is associated with. Subclasses may override this method to do appropriate initialization.

Overrides:

initialize in class DoFn<S,S>

process

public void process(S input,
                    Emitter<S> emitter)

Description copied from class: DoFn

Processes the records from a PCollection.

Note: Crunch can reuse a single input record object whose content changes on each DoFn.process(Object, Emitter) method call. This functionality is imposed by Hadoop's Reducer implementation: The framework will reuse the key and value objects that are passed into the reduce, therefore the application should clone the objects they want to keep a copy of.

Specified by:

process in class DoFn<S,S>

Parameters:

input - The input record.

emitter - The emitter to send the output to