com.hazelcast.mapreduce

Interface JobTracker

All Superinterfaces:

DistributedObject

All Known Implementing Classes:

AbstractJobTracker, ClientMapReduceProxy

@Beta
public interface JobTracker
extends DistributedObject

The JobTracker interface is used to create instances of Jobs depending on the given data structure / data source.

The underlying created instance of the Job depends on whether it is used for a HazelcastClient or a Hazelcast member node.

The default usage is same for both cases and looks similar to the following example:

 HazelcastInstance hz = getHazelcastInstance();
 IMap map = hz.getMap( getMapName() );
 JobTracker tracker = hz.getJobTracker( "default" );
 Job job = tracker.newJob( KeyValueSource.fromMap( map ) );
 

The created instance of JobTracker is fully threadsafe and can be used concurrently and multiple times.
Caution: Do not use the JobTracker with data structures of other HazelcastInstance instances than the one used for creation of the JobTracker. Unexpected results may happen!

Since:

3.2

Method Summary

Methods

Modifier and Type	Method and Description
<V> TrackableJob<V>	getTrackableJob(String jobId) Returns an implementation of TrackableJob, or null if the job id is not available or the job is already finished.
<K,V> Job<K,V>	newJob(KeyValueSource<K,V> source) Builds a Job instance for the given KeyValueSource instance.

Methods inherited from interface com.hazelcast.core.DistributedObject

destroy, getName, getPartitionKey, getServiceName

Method Detail

newJob

<K,V> Job<K,V> newJob(KeyValueSource<K,V> source)

Builds a Job instance for the given KeyValueSource instance. The returning implementation depends on the HazelcastInstance that created the JobTracker.
Caution: Do not use the JobTracker with data structures of other HazelcastInstance instances than the one used for creation of the JobTracker. Unexpected results may happen!

Type Parameters:

K - type of the key

V - type of the value

Parameters:

source - data source the created Job should work on

Returns:

instance of the Job bound to the given KeyValueSource

getTrackableJob

<V> TrackableJob<V> getTrackableJob(String jobId)

Returns an implementation of TrackableJob, or null if the job id is not available or the job is already finished.

Type Parameters:

V - type of the resulting value

Parameters:

jobId - job id to search the TrackableJob for

Returns:

a trackable job for given job id or null if the job id is not available