Backport: Adjust service chain ownership when reassigning services between workers (#5435)#5506
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bart-linera merged 11 commits intolinera-io:testnet_conwayfrom Feb 25, 2026
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The Start and Stop messages now carry handoff-related fields. Update the service assignment, service removal, and messages table to match the code. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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## Motivation #5506 revealed a bug in the `ChainListener`, which is not exposed by the existing tests on `main` due to different handling of event subscriptions. The bug is that when the `ChainListener` stops listening to a chain, it doesn't remove it from the `event_subscriptions` map. ## Proposal Always remove a chain from `event_subscriptions` when no longer listening to it. ## Test Plan CI will catch regressions. ## Release Plan - Nothing to do / These changes follow the usual release cycle. ## Links - [reviewer checklist](https://github.com/linera-io/linera-protocol/blob/main/CONTRIBUTING.md#reviewer-checklist)
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Motivation
If a service is reassign from worker A to worker B by the controller application, worker A should cease to be the owner of the service's chain, and worker B should become an owner.
Proposal
Upon reassignment, when telling worker A to stop running the service, worker A will add worker B as an owner and notify the main controller chain.
The main controller will then tell worker B to take over, telling it at which height on the service chain it became an owner. Worker B then waits until it synchronizes the service chain until that height, and when it's ready, it starts listening to the chain in FullChain mode and removes worker A as an owner.
Test Plan
test_controllerwas extended to reassign a service from one worker to another, and then check if the second worker properly handles a task request.Release Plan
Links