[jira] [Assigned] (KAFKA-5075) The position in the consumers may be advanced incorrectly when some exception is thrown from consumer.poll()

["Jiangjie Qin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-5075?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jiangjie Qin reassigned KAFKA-5075:
-----------------------------------

    Assignee: Dong Lin

> The position in the consumers may be advanced incorrectly when some exception is thrown from consumer.poll()
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-5075
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5075
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients, consumer
>    Affects Versions: 0.10.2.0
>            Reporter: Jiangjie Qin
>            Assignee: Dong Lin
>             Fix For: 0.11.0.0
>
>
> In Fetcher.fetchRecords() we iterate over the partition data to collect the ConsumerRecords, after we collect some consumer records from a partition, we advance the position of that partition then move on to the next partition. If the next partition throws exceptions (e.g. OffsetOutOfRangeException), the messages that have already been read out of the buffer will not be delivered to the users. Since the positions of the previous partitions have been be updated, those messages will not be consumed again either.



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