huxihx commented on KAFKA-5724:

[~hachikuji] Currently, it is possible that user could employee 
KafkaAdminClient to create a topic with an assignment where partitions are 
neither consecutive nor zero-based.

> AbstractPartitionAssignor does not take into consideration that partition 
> number may start from non-zero
> --------------------------------------------------------------------------------------------------------
>                 Key: KAFKA-5724
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5724
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients, consumer
>    Affects Versions:
>            Reporter: Allen Wang
>            Assignee: huxihx
> In AbstractPartitionAssignor.assign(Cluster metadata, Map<String, 
> Subscription> subscriptions), it invokes assign(partitionsPerTopic, 
> subscriptions). It assumes that partition number starts from 0, and it 
> constructs TopicPartition in the range of [0, partitionsPerTopic). 
> This assumption is not correct. The correct way to handle it is to follow the 
> same approach in producer's DefaultPartitioner, where it uses [0, 
> numberOfPartition) as an index to the actual partition.
> There are use cases where partition number may not start from zero. It can 
> happen if users use advanced tooling to manually craft the partition number 
> when creating topics.

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