[manager] write_location_manager callback failed

[MMeecatfish]

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[qoderai]

👋 Review Summary

This PR improves how write timeouts are handled by propagating WriteLocationInfo through the callback, wiring it into CacheManager::FinishWriteCache, and tightening the tests around expiration and cleanup paths. The changes overall move the write timeout behavior in a safer and more observable direction.

🛡️ Key Risks & Issues

• Write timeout callbacks in CacheManager::StartWriteCache now call FinishWriteCache with a non-null WriteLocationInfo instead of relying on GetAndDelete. This fixes the prior issue where expired sessions could not be finished, but it’s a behavior change: timeout now actively processes all blocks with succeed_block = 0. It would be good to double-check this aligns with upper-layer expectations for how timed-out writes should be reconciled and reclaimed, especially if callers previously assumed timeouts did not trigger delete work.
• The new callback signature in WriteLocationManager looks structurally sound and improves ownership clarity by passing a unique_ptr<WriteLocationInfo> out of the internal map after erasure. I did not see new concurrency or lifetime hazards introduced by this pattern; the callbacks are invoked after the map unlocks, with exclusive ownership of the metadata.
• In WriteLocationManagerTest.MultiThreadTest, the callback currently captures keys and ids by value while also passing them by std::move into Put, and it calls GetAndDelete("session_1", dummy) for every worker. This makes the assertions rely on unspecified evaluation order and only exercises a single hard-coded session in the cleanup call. I’ve left an inline comment with concrete suggestions to make this test deterministic and properly per-session.

🧪 Verification Advice

• Add or extend a test that explicitly covers the timeout callback path in CacheManager::StartWriteCache → FinishWriteCache, ensuring that when the session expires and the callback fires, the passed WriteLocationInfo is used correctly and the reclaimer work is scheduled as intended.
• Consider adding a scenario that uses a non-zero success mask at timeout (e.g., some blocks already written) to validate that FinishWriteCache’s block-level accounting and subsequent reclaim behavior remain correct under partial success.
• If feasible in the existing test harness, add a small test or assertion around the new logging branches in ReclaimerTaskSupervisor::Submit to confirm that failures from schedule_plan_executor_->Submit are observable in logs during negative-path testing.

💡 Thoughts & Suggestions

• The move to passing WriteLocationInfo via unique_ptr is a nice step toward making the ownership model explicit and avoiding double-consumption of session data. Once the MultiThreadTest lambda is cleaned up, these tests should give you a solid base for future evolutions of the expiration/cleanup mechanism.
• For future maintenance, it might be worth centralizing the logic that decides what success_block_mask should be in timeout vs. normal completion paths, so the semantics stay consistent if additional write states or metrics are introduced later.

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[qoderai]

In MultiThreadTest, the lambda captures keys and ids by value while the same variables are passed as std::move(keys) / std::move(ids) into Put on lines 71–74. Because function argument evaluation order is unspecified, some compilers may evaluate the captures after the move, so the captured keys/ids end up empty and the ASSERT_EQ(keys, info->keys) / ASSERT_EQ(ids, info->location_ids) checks rely on unspecified behavior. It would be safer to either avoid std::move here or build separate vectors solely for the assertions.

Also, inside the same callback you call GetAndDelete("session_1", dummy) regardless of which session_id was used for this worker. That means this test is not actually validating per-session cleanup for the current worker and could hide issues with how different sessions are managed. Using the session_id parameter instead of a hard-coded "session_1" would better exercise the intended multi-session behavior.

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