Denovo1998 opened a new pull request, #23907:
URL: https://github.com/apache/pulsar/pull/23907
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<!-- Either this PR fixes an issue, -->
Fixes #xyz
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Main Issue: [#23149](https://github.com/apache/pulsar/issues/23149)
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PIP: #xyz
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### Motivation
<!-- Explain here the context, and why you're making that change. What is
the problem you're trying to solve. -->
In dynamic event-driven architectures, the relevance and timing of messages
are crucial. Apache Pulsar currently supports delayed message delivery, which
is beneficial for scheduling future processing. However, once scheduled, there
is no native support to modify or cancel these messages based on changing
circumstances. This limitation poses challenges in situations where messages
become obsolete before their scheduled delivery or when system conditions
change, necessitating the early processing or cancellation of delayed messages.
如果目前想要实现延迟消息的取消，我们只能在consumer端的内存中存储需要取消的延迟消息，如果延迟时间过长会有很多问题。
### Modifications
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The following changes were introduced in Pulsar’s message dispatching
components to enable delayed message cancellation:
- Extended AbstractBaseDispatcher with the ability to recognize and handle
cancellation properties in message metadata.
- Added constants for identifying cancellation-specific properties in
message metadata.
The key implementation detail involves checking each message for a
cancellation marker as it becomes eligible for dispatch. If a message is marked
for cancellation, it is dropped from the dispatch queue and its associated
resources are cleaned up immediately.
### Verifying this change
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This change is a trivial rework / code cleanup without any test coverage.
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This change is already covered by existing tests, such as *(please describe
tests)*.
*(or)*
This change added tests and can be verified as follows:
*(example:)*
- *Added integration tests for end-to-end deployment with large payloads
(10MB)*
- *Extended integration test for recovery after broker failure*
### Does this pull request potentially affect one of the following parts:
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- [ ] Dependencies (add or upgrade a dependency)
- [ ] The public API
- [ ] The schema
- [ ] The default values of configurations
- [ ] The threading model
- [ ] The binary protocol
- [ ] The REST endpoints
- [ ] The admin CLI options
- [ ] The metrics
- [ ] Anything that affects deployment
### Documentation
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- [ ] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
PR in forked repository: <!-- ENTER URL HERE -->
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