fix: rest api /api/executors does not show executors if TaskSchedulingPolicy::PullStaged
#1175
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Which issue does this PR close?
Closes #1174.
Rationale for this change
Rest api reports correct number of registered executors in case of
TaskSchedulingPolicy::PullStagedWhat changes are included in this PR?
In case
TaskSchedulingPolicy::PullStagedis configured, executor registration is slightly different and no heartbeat are sent from executor to client. rest api method returning executors will call method which will first call heartbeats status and then consult registered executor list. This change will revert that order.As heartbeat is not available there is no information about when is executor last seen, so rest api will return None in that case. This behaviour can be changed, we can add additional field in ExecutorMetadata indicating when was the last time executor called scheduler.
Are there any user-facing changes?
No