yahoNanJing commented on code in PR #728:
URL: https://github.com/apache/arrow-ballista/pull/728#discussion_r1153416559
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ballista/scheduler/src/cluster/kv.rs:
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@@ -57,6 +56,8 @@ pub struct KeyValueState<
> {
/// Underlying `KeyValueStore`
store: S,
+ /// ExecutorHeartbeat cache, executor_id -> ExecutorHeartbeat
+ executor_heartbeats: Arc<DashMap<String, ExecutorHeartbeat>>,
Review Comment:
I think for the plan, it's also been cached and we only need to do the
serialization only once for one query. So do you still have the problem?
The reason I do not prefer the multiple active schedulers is the contention
for the execution slots, which will lead to inefficient slots updates and the
infeasibility of future consistent hashing based task assignments.
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