org.apache.kafka.clients.consumer

Class RangeAssignor

java.lang.Object

org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor

org.apache.kafka.clients.consumer.RangeAssignor

All Implemented Interfaces:

org.apache.kafka.clients.consumer.internals.PartitionAssignor

public class RangeAssignor
extends org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor

The range assignor works on a per-topic basis. For each topic, we lay out the available partitions in numeric order and the consumers in lexicographic order. We then divide the number of partitions by the total number of consumers to determine the number of partitions to assign to each consumer. If it does not evenly divide, then the first few consumers will have one extra partition.

For example, suppose there are two consumers C0 and C1, two topics t0 and t1, and each topic has 3 partitions, resulting in partitions t0p0, t0p1, t0p2, t1p0, t1p1, and t1p2.

The assignment will be:

• C0: [t0p0, t0p1, t1p0, t1p1]
• C1: [t0p2, t1p2]

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.kafka.clients.consumer.internals.PartitionAssignor

org.apache.kafka.clients.consumer.internals.PartitionAssignor.Assignment, org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription

Constructor Summary

Constructors

Constructor and Description
RangeAssignor()

Method Summary

Modifier and Type	Method and Description
java.util.Map<java.lang.String,java.util.List<TopicPartition>>	assign(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic, java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)
java.lang.String	name()

Methods inherited from class org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor

assign, onAssignment, partitions, put, subscription

Methods inherited from class java.lang.Object

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

Constructor Detail

RangeAssignor

public RangeAssignor()

Method Detail

name

public java.lang.String name()

assign

public java.util.Map<java.lang.String,java.util.List<TopicPartition>> assign(java.util.Map<java.lang.String,java.lang.Integer> partitionsPerTopic,
                                                                             java.util.Map<java.lang.String,org.apache.kafka.clients.consumer.internals.PartitionAssignor.Subscription> subscriptions)

Specified by:

assign in class org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor