[jira] [Created] (KAFKA-9583) OffsetsForLeaderEpoch requests are sometimes not sent to the leader of partition

["Andy Fang (Jira)" <ji...@apache.org>]

Andy Fang created KAFKA-9583:
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             Summary: OffsetsForLeaderEpoch requests are sometimes not sent to the leader of partition
                 Key: KAFKA-9583
                 URL: https://issues.apache.org/jira/browse/KAFKA-9583
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 2.3.1, 2.4.0
            Reporter: Andy Fang


In [{{validateOffsetsAsync}}|https://github.com/apache/kafka/blob/2.3.1/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L737], we group the requests by leader node for efficiency. The list of topic-partitions are grouped from {{partitionsToValidate}} (all partitions) to {{node}} => [{{fetchPostitions}} (partitions by node)|https://github.com/apache/kafka/blob/2.3.1/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L739].

However, when actually sending the request with {{OffsetsForLeaderEpochClient}}, we use [{{partitionsToValidate}}|https://github.com/apache/kafka/blob/2.3.1/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L765], which is the list of all topic-partitions passed into {{validateOffsetsAsync}}. This results in extra partitions being included in the request sent to brokers that are potentially not the leader for those partitions.



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