org.apache.ignite.ml.genetic

Class CrossOverTask

java.lang.Object

org.apache.ignite.compute.ComputeTaskAdapter<List<Long>,Boolean>

org.apache.ignite.ml.genetic.CrossOverTask

All Implemented Interfaces:

Serializable, ComputeTask<List<Long>,Boolean>

public class CrossOverTask
extends ComputeTaskAdapter<List<Long>,Boolean>

Responsible for assigning 2 X 'parent' chromosomes to produce 2 X 'child' chromosomes.

CrossOverTask leverages Ignite's data affinity capabilities for routing CrossOverJobs to primary
IgniteNode where 'parent' chromosomes reside.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
CrossOverTask(GAConfiguration cfg)

Method Summary

Modifier and Type	Method and Description
Map	map(List<ClusterNode> nodes, List<Long> chromosomeKeys) Map Jobs to nodes using data affinity.
Boolean	reduce(List<ComputeJobResult> list) We return TRUE if success, else Exection is thrown.
ComputeJobResultPolicy	result(ComputeJobResult res, List<ComputeJobResult> rcvd) Default implementation which will wait for all jobs to complete before calling ComputeTask.reduce(List) method.

Methods inherited from class java.lang.Object

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

Constructor Detail

CrossOverTask

public CrossOverTask(GAConfiguration cfg)

Parameters:

cfg - GAConfiguration

Method Detail

map

public Map map(List<ClusterNode> nodes,
               List<Long> chromosomeKeys)
        throws IgniteException

Map Jobs to nodes using data affinity.

Parameters:

nodes - Cluster Nodes

chromosomeKeys - Primary keys for respective chromosomes

Returns:

A map of nodes to jobs.

Throws:

IgniteException - If mapping could not complete successfully. This exception will be thrown out of ComputeTaskFuture.get() method.

reduce

public Boolean reduce(List<ComputeJobResult> list)
               throws IgniteException

We return TRUE if success, else Exection is thrown.

Parameters:

list - ComputeJobResult

Returns:

Boolean value; if operationa was successful return true, otherwise Exception

Throws:

IgniteException - If reduction or results caused an error. This exception will be thrown out of ComputeTaskFuture.get() method.

result

public ComputeJobResultPolicy result(ComputeJobResult res,
                                     List<ComputeJobResult> rcvd)

Description copied from class: ComputeTaskAdapter

Default implementation which will wait for all jobs to complete before calling ComputeTask.reduce(List) method.

If remote job resulted in exception (ComputeJobResult.getException() is not null), then ComputeJobResultPolicy.FAILOVER policy will be returned if the exception is instance of ClusterTopologyException or ComputeExecutionRejectedException, which means that remote node either failed or job execution was rejected before it got a chance to start. In all other cases the exception will be rethrown which will ultimately cause task to fail.

Specified by:

result in interface ComputeTask<List<Long>,Boolean>

Overrides:

result in class ComputeTaskAdapter<List<Long>,Boolean>

Parameters:

res - ComputeJobResult

rcvd - List of ComputeJobResult

Returns:

ComputeJobResultPolicy