[Umbrella] Rescale buckets for future partitions
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调研方向
先阅读 #3907 中链接的核心工作和已实现的 PR #3908，然后选择一个独立的子问题：#4280 用于聚合恢复测试，#4287 用于异步动态分区写入，或 #4289 用于功能文档。先阅读所选的子问题，并根据其中规定的恢复、路由或文档要求验证是否完成。
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描述
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- I searched the existing issues and found no umbrella issue tracking this work.
Description
This umbrella issue tracks support for changing the bucket count of future partitions, together with the recovery coverage and client improvements needed around this feature.
Changing a partitioned table's bucket.num should affect only partitions created after the change. Existing partitions retain their original bucket counts, without data redistribution or lake-file rewrites. Reads, writes, and recovery must therefore work correctly when partitions of the same table have different bucket counts.
Sub-issues
- #3907 — Core support for per-partition bucket rescaling, implemented in #3908: persist and propagate each partition's bucket count and use it for routing while allowing the table default to change for future partitions.
- #4280 — Add aggregation recovery tests across partitions with different bucket counts. Cover both restoration from a real aggregation checkpoint and recovery through producer offsets without a checkpoint, including another failure during recovery. Exercise multiple operator subtasks and verify exact aggregate results with no duplicate application or data loss.
- #4287 — Keep dynamic partition writes non-blocking with asynchronous partition creation and metadata refresh. Use fresh partition metadata when forming new batches and validate each queued batch's original routing at send time, failing incompatible batches rather than silently changing their routing.
- #4289 — Add feature introduction and usage documentation, including runnable examples for increasing and decreasing future partitions' bucket counts, existing/pre-created partition semantics, and supported configurations and compatibility requirements.
Delivery scope
The core feature is tracked by #3907 and PR #3908. The recovery tests, asynchronous write-path improvement, and user documentation are tracked independently in the sub-issues above. In particular, #4287 is a follow-up to be addressed in a separate PR after #3908; it is not required to be implemented within #3908.
This umbrella remains open until all sub-issues are completed.
Are you willing to submit a PR?
- I'm willing to submit a PR.
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