jiengup opened a new pull request, #4278:
URL: https://github.com/apache/iggy/pull/4278
## Which issue does this PR address?
Closes #4252
## Rationale
A fresh handle opened for a backup hard link can miss a
writeback error recorded on the original writer. The
backup could then be published with lost bytes.
## What changed?
Before publishing .install-backup, state transfer now
synchronizes live segment and index writers, retained
offset files, and the WAL while holding the partition
write lock. A sync failure fences the install; this
barrier does not advance the checkpoint frontier. The
simulator writeback regression is enabled, and the shared
file sync type no longer carries a checkpoint-specific
name.
## Local Execution
- Passed: cargo fmt --all, cargo sort --no-format
--workspace, full workspace Clippy, cargo check -p
partitions --no-default-features, and the partitions and
simulator unit suites.
- Pre-commit hooks passed. The Linux-only partition
regression was not run locally on macOS; the simulator
regression passed.
## AI Usage
1. Tool: OpenAI Codex.
2. Scope: analysis, implementation, tests, and review.
3. Verification: the local checks and test suites listed
above.
4. I can explain every changed line if asked.
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