GitHub user zuyu opened a pull request:
This PR introduced `WorkOrderSelectionPolicy` to choose the next
`WorkOrder` for the execution, and uses the following policy: first `FIFO` for
`RebuildWorkOrder`s, and then `LIFO` for normal `WorkOrder`s.
This policy favors any `RebuildWorkOrder` to reduce the total operator
completion time, and normal `WorkOrder`s generated from data pipeline messages.
Finally, a normal `WorkOrder` from a larger `OperatorIndex` is preferred.
Assigned to @jianqiao.
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This closes #279
Author: Zuyu Zhang <z...@cs.wisc.edu>
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