RoundRobinManualPartitioner (Storm 2.7.1 API)

java.lang.Object
- org.apache.storm.kafka.spout.subscription.RoundRobinManualPartitioner

All Implemented Interfaces:

Serializable, ManualPartitioner
```
public class RoundRobinManualPartitioner
extends Object
implements ManualPartitioner
```
Assign partitions in a round robin fashion for all spouts, not just the ones that are alive. Because the parallelism of the spouts does not typically change while running this makes the assignments more stable in the face of crashing spouts.
Round Robin means that first spout of N spouts will get the first partition, and the N+1th partition... The second spout will get the second partition and N+2th partition etc.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

RoundRobinManualPartitioner()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Set<org.apache.kafka.common.TopicPartition>`	`getPartitionsForThisTask(List<org.apache.kafka.common.TopicPartition> allPartitionsSorted, TopologyContext context)`	Filter the list of all partitions handled by this set of spouts to get only the partitions assigned to this task.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RoundRobinManualPartitioner
```
public RoundRobinManualPartitioner()
```
- Method Detail
  - getPartitionsForThisTask
```
public Set<org.apache.kafka.common.TopicPartition> getPartitionsForThisTask(List<org.apache.kafka.common.TopicPartition> allPartitionsSorted,
                                                                            TopologyContext context)
```
    Description copied from interface: ManualPartitioner
    
    Filter the list of all partitions handled by this set of spouts to get only the partitions assigned to this task.
    
    Specified by:
    
    getPartitionsForThisTask in interface ManualPartitioner
    
    Parameters:
    
    allPartitionsSorted - all of the partitions that the set of spouts want to subscribe to in a strict ordering that is consistent across tasks
    
    context - the context of the topology
    
    Returns:
    
    the subset of the partitions that this spout task should handle.