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https://issues.apache.org/jira/browse/KAFKA-9322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17002073#comment-17002073
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ASF GitHub Bot commented on KAFKA-9322:
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huxihx commented on pull request #7860: KAFKA-9322: Add `tail -n` feature for
ConsoleConsumer
URL: https://github.com/apache/kafka/pull/7860
https://issues.apache.org/jira/browse/KAFKA-9322
When debugging, it will be convenient to quickly check the last N messages
for a partition using ConsoleConsumer. Currently `offset` could not be negative
except -1 and -2. However, we could simply break this rule to support `tail -n`
feature.
Slightly different, with this patch applied, -1 means the last one message
instead of the latest offset, -2 means the last two messages intead of the
earliest offset. You could use `latest` and `earliest` explicitly if you really
start reading from those positions.
*More detailed description of your change,
if necessary. The PR title and PR message become
the squashed commit message, so use a separate
comment to ping reviewers.*
*Summary of testing strategy (including rationale)
for the feature or bug fix. Unit and/or integration
tests are expected for any behaviour change and
system tests should be considered for larger changes.*
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> Add `tail -n` feature for ConsoleConsumer
> -----------------------------------------
>
> Key: KAFKA-9322
> URL: https://issues.apache.org/jira/browse/KAFKA-9322
> Project: Kafka
> Issue Type: Improvement
> Components: tools
> Affects Versions: 2.4.0
> Reporter: huxihx
> Assignee: huxihx
> Priority: Major
>
> When debugging, it will be convenient to quickly check the last N messages
> for a partition using ConsoleConsumer. Currently `offset` could not be
> negative except -1 and -2. However, we could simply break this rule to
> support `tail -n` feature. A tricky thing is currently we treat -1 and -2 as
> special values, so I am not sure if a new KIP is needed.
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