pub struct ControlTableEngine { /* private fields */ }Expand description
Distributed coordination engine backed by a Delta Lake table.
Uses Delta Lake’s optimistic concurrency control (OCC) to implement
distributed task locking across multiple K8s pods. The transaction log
serializes concurrent claims — if two pods race to claim the same task,
one commit succeeds and the other gets a TransactionError.
The control table lives at {storage_uri}/_scouter_control/ alongside
the trace data tables.
Implementations§
Source§impl ControlTableEngine
impl ControlTableEngine
Sourcepub async fn new(
storage_settings: &ObjectStorageSettings,
pod_id: String,
) -> Result<Self, TraceEngineError>
pub async fn new( storage_settings: &ObjectStorageSettings, pod_id: String, ) -> Result<Self, TraceEngineError>
Create or load the control table.
The pod_id identifies this instance for distributed locking. In K8s,
pass the pod hostname (std::env::var("HOSTNAME")).
Sourcepub async fn try_claim_task(
&self,
task_name: &str,
) -> Result<bool, TraceEngineError>
pub async fn try_claim_task( &self, task_name: &str, ) -> Result<bool, TraceEngineError>
Try to claim a task for exclusive execution.
Returns true if this pod successfully claimed the task.
Returns false if:
- Another pod is already processing (and the lock is not stale)
- The task is not yet due (
next_run_atis in the future) - A concurrent pod won the Delta OCC race
This is the distributed equivalent of SELECT ... FOR UPDATE SKIP LOCKED.
Sourcepub async fn release_task(
&self,
task_name: &str,
next_run_interval: Duration,
) -> Result<(), TraceEngineError>
pub async fn release_task( &self, task_name: &str, next_run_interval: Duration, ) -> Result<(), TraceEngineError>
Release a task after successful completion, scheduling the next run.
Sets status to “idle” and updates next_run_at based on the provided interval.
Sourcepub async fn release_task_on_failure(
&self,
task_name: &str,
) -> Result<(), TraceEngineError>
pub async fn release_task_on_failure( &self, task_name: &str, ) -> Result<(), TraceEngineError>
Release a task after a failure, keeping the original next_run_at so it
can be retried immediately by any pod.
Sourcepub async fn is_task_due(
&self,
task_name: &str,
) -> Result<bool, TraceEngineError>
pub async fn is_task_due( &self, task_name: &str, ) -> Result<bool, TraceEngineError>
Check if a task is due and not currently being processed.
Auto Trait Implementations§
impl Freeze for ControlTableEngine
impl !RefUnwindSafe for ControlTableEngine
impl Send for ControlTableEngine
impl Sync for ControlTableEngine
impl Unpin for ControlTableEngine
impl UnsafeUnpin for ControlTableEngine
impl !UnwindSafe for ControlTableEngine
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