phillipleblanc commented on code in PR #1891:
URL:
https://github.com/apache/datafusion-ballista/pull/1891#discussion_r3611649177
##########
ballista/scheduler/src/scheduler_server/mod.rs:
##########
@@ -85,9 +88,20 @@ pub struct SchedulerServer<T: 'static + AsLogicalPlan, U:
'static + AsExecutionP
query_stage_scheduler: Arc<QueryStageScheduler<T, U>>,
/// Scheduler configuration.
config: Arc<SchedulerConfig>,
+ /// Broadcast sender for job state change notifications.
+ ///
+ /// Subscribers can receive notifications when jobs change state by calling
+ /// `subscribe_job_updates()`.
+ job_state_sender: broadcast::Sender<job_state_event::JobStateEvent>,
}
impl<T: 'static + AsLogicalPlan, U: 'static + AsExecutionPlan>
SchedulerServer<T, U> {
+ /// Default capacity for the job state broadcast channel.
+ ///
+ /// This determines how many job state events can be buffered before
+ /// slow receivers start lagging behind.
+ const JOB_STATE_CHANNEL_CAPACITY: usize = 256;
Review Comment:
This is now configurable.
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