Hitless upgrades #3021
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Hitless upgrades #3021
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PavelPashov
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Sep 1, 2025
…narios - Added `SocketTimeoutDuringMaintananceError`, a subclass of `TimeoutError`, to handle socket timeouts during maintenance. - Added `CommandTimeoutDuringMaintananceError`, another subclass of `TimeoutError`, to address command write timeouts during maintenance.
…inkedList functionality - Introduced `EmptyAwareSinglyLinkedList`, a subclass of `SinglyLinkedList` that emits an `empty` event when the list becomes empty due to `reset`, `shift`, or `remove` operations. - Added `nodes()` iterator method to `DoublyLinkedList` for iterating over nodes directly. - Enhanced unit tests for `DoublyLinkedList` and `SinglyLinkedList` to cover edge cases and new functionality. - Added comprehensive tests for `EmptyAwareSinglyLinkedList` to validate `empty` event emission under various scenarios. - Improved code formatting and consistency.
- Replaced `setInvalidateCallback` with a more flexible `addPushHandler` method, allowing multiple handlers for push notifications. - Introduced the `PushHandler` type to standardize push notification processing. - Refactored `RedisCommandsQueue` to use a `#pushHandlers` array, enabling dynamic and modular handling of push notifications. - Updated `RedisClient` to leverage the new handler mechanism for `invalidate` push notifications, simplifying and decoupling logic.
…mplete - Introduced `waitForInflightCommandsToComplete` method to asynchronously wait for all in-flight commands to finish processing. - Utilized the `empty` event from `#waitingForReply` to signal when all commands have been completed.
…-queue - Added `#inMaintenance` property and `set inMaintenance` setter to track maintenance mode state.d `#maintenanceCommandTimeout` and `setMaintenanceCommandTimeout` method to dynamically adjust command timeouts during maintenance.mmandTimeout` over individual command timeouts.DuringMaintananceError` is used when in maintenance mode.
…ndling - Introduced `#inMaintenance` property and setter to track maintenance mode state in `RedisSocket`. - Added `#maintenanceTimeout` and `setMaintenanceTimeout` method to dynamically adjust socket timeouts during maintenance. - Enhanced timeout error handling to differentiate between regular timeouts (`SocketTimeoutError`) and maintenance-specific timeouts (`SocketTimeoutDuringMaintananceError`).
- Introduced `maintPushNotifications` option to control how the client handles Redis Enterprise maintenance push notifications (`disabled`, `enabled`, `au to`). - Added `maintMovingEndpointType` option to specify the endpoint type for reconnecting during a MOVING notification (`auto`, `internal-ip`, `external-ip`, etc.). - Added `maintRelaxedCommandTimeout` option to define a relaxed timeout for commands during maintenance. - Added `maintRelaxedSocketTimeout` option to define a relaxed timeout for the socket during maintenance. - Enforced RESP3 requirement for maintenance-related features (`maintPushNotifications`).
- Introduced `#paused` flag with corresponding `_pause` and `_unpause` methods to temporarily halt writing commands to the socket during maintenance windows. - Updated `#write` method to respect the `#paused` flag, preventing new commands from being written during maintenance. - Added `_ejectSocket` method to safely detach from and return the current socket - Added `_insertSocket` method to receive and start using a new socket
This was referenced Nov 22, 2025
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