risingwave_meta::barrier::checkpoint::recovery

Enum DatabaseRecoveringStage

Source 
enum DatabaseRecoveringStage {
    Resetting {
        remaining_workers: HashSet<WorkerId>,
        reset_resps: HashMap<WorkerId, ResetDatabaseResponse>,
        reset_request_id: u32,
        backoff_future: Option<impl Future<Output = ()> + Unpin + Send + 'static>,
    },
    Initializing {
        initial_barrier_collector: Box<DatabaseInitialBarrierCollector>,
    },
}
Expand description

We can treat each database as a state machine of 3 states: Running, Resetting and Initializing. The state transition can be triggered when receiving 3 variants of response: ReportDatabaseFailure, BarrierComplete, DatabaseReset. The logic of state transition can be summarized as followed:

Running - on ReportDatabaseFailure - wait for the inflight BarrierCompletingTask to finish if there is any, mark the database as blocked in command queue - send ResetDatabaseRequest with reset_request_id as 0 to all CNs, and save reset_request_id and the set of nodes that need to collect response. - enter Resetting state. - on BarrierComplete: update the DatabaseCheckpointControl. - on DatabaseReset: unreachable Resetting - on ReportDatabaseFailure or BarrierComplete: ignore - on DatabaseReset: - if the reset_request_id in the response is less than the saved reset_request_id, ignore - otherwise, mark the CN as collected. - when all CNs have collected the response: - load the database runtime info from catalog manager and fragment manager - inject the initial barrier to CNs, save the set of nodes that need to collect response - enter Initializing state Initializing - on BarrierComplete: - mark the CN as collected - when all CNs have collected the response: enter Running - on ReportDatabaseFailure - increment the previously saved reset_request_id, and send ResetDatabaseRequest to all CNs - enter Resetting - on DatabaseReset: unreachable

Variants§

§

Resetting

Fields

§remaining_workers: HashSet<WorkerId>
§reset_resps: HashMap<WorkerId, ResetDatabaseResponse>
§reset_request_id: u32
§backoff_future: Option<impl Future<Output = ()> + Unpin + Send + 'static>
§

Initializing

Fields

§initial_barrier_collector: Box<DatabaseInitialBarrierCollector>

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