[jira] [Updated] (KAFKA-20131) ClassicKafkaConsumer does not clear endOffsetRequested flag on failed LIST_OFFSETS calls

["Kirk True (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-20131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kirk True updated KAFKA-20131:
------------------------------
    Fix Version/s: 4.0.2

> ClassicKafkaConsumer does not clear endOffsetRequested flag on failed LIST_OFFSETS calls
> ----------------------------------------------------------------------------------------
>
>                 Key: KAFKA-20131
>                 URL: https://issues.apache.org/jira/browse/KAFKA-20131
>             Project: Kafka
>          Issue Type: Bug
>          Components: clients, consumer
>    Affects Versions: 3.9.1, 4.0.0, 4.1.0, 4.2.0
>            Reporter: Kirk True
>            Assignee: Kirk True
>            Priority: Critical
>             Fix For: 4.3.0, 4.0.2, 4.1.2, 4.2.1
>
>
> When {{ClassicKafkaConsumer.currentLag()}} is called, {{SubscriptionState.requestPartitionEndOffset()}} is called, which sets a per-partition flag named {{endOffsetRequested}}. This flag is later cleared by {{SubscriptionState.updateLastStableOffset()}}/{{SubscriptionState.updateHighWatermark()}} when a successful {{LIST_OFFSETS}} call is received. However, if the partition has an error code in the response, or the {{LIST_OFFSETS}} call itself fails, neither update method is called, and {{endOffsetRequested}} remains set. The problem is, on _any subsequent_ call to {{ClassicKafkaConsumer.currentLag()}}, the logic will see that {{endOffsetRequested}} is already set, and the offset request will be silently ignored.
> The fix is to ensure that {{endOffsetRequested}} is cleared out even on failure cases.
> Note: this is the companion ticket to KAFKA-20187 which affects the {{AsyncKafkaConsumer}}.



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