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Posted to jira@kafka.apache.org by "Jason Gustafson (JIRA)" <ji...@apache.org> on 2019/02/01 22:37:00 UTC
[jira] [Resolved] (KAFKA-7873) KafkaBasedLog's consumer should
always seek to beginning when starting
[ https://issues.apache.org/jira/browse/KAFKA-7873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jason Gustafson resolved KAFKA-7873.
------------------------------------
Resolution: Fixed
Fix Version/s: 2.0.2
2.1.1
2.2.0
> KafkaBasedLog's consumer should always seek to beginning when starting
> ----------------------------------------------------------------------
>
> Key: KAFKA-7873
> URL: https://issues.apache.org/jira/browse/KAFKA-7873
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 2.1.0
> Reporter: Randall Hauch
> Assignee: Randall Hauch
> Priority: Critical
> Fix For: 2.2.0, 2.1.1, 2.0.2
>
>
> KafkaBasedLog expects that callers set the `group.id` for the consumer configuration, and does not itself set the `group.id` if the caller does not explicitly do so. However, [KIP-289|https://cwiki.apache.org/confluence/display/KAFKA/KIP-289%3A+Improve+the+default+group+id+behavior+in+KafkaConsumer] changed the default for the `group.id` from a blank string to be null, which changes how KafkaBasedLog behaves when no `group.id` is set, and it actually deprecates and issues a warning when no `group.id` is specified.
> When KafkaBasedLog starts up, it should always start from the beginning of the topic and consume to the end. The consumer's logic for where to start is always:
> # explicit seek
> # committed offset (skipped if group.id is null)
> # auto reset behavior
> and currently Connect does not explicitly seek to the beginning and instead relies upon `auto.offset.reset=earliest`. However, if a `group.id` is specified *ant* there are committed offsets, then the consumer will start from the committed offsets rather than from the beginning. If a 'group.id' is not specified, then the auto reset behavior should work.
> However, to avoid the warning and possible exception when no `group.id` is specified, KafkaBasedLog should always call {{consumer.seekToBeginning()}} during startup.
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