yahoNanJing opened a new pull request #1983:
URL: https://github.com/apache/arrow-datafusion/pull/1983
# Which issue does this PR close?
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Closes #1936.
# Rationale for this change
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Previously the task fetching time complexity is n^2. By introducing
stage-based scheduling, it can be reduced to n. And it will also be easy for
task error recovering and stage priority-based scheduling in the future.
What's more, by this PR, the performance of Pull-Staged task scheduling is
also improved a lot due to there's no need to check all of the tasks status in
the whole system.
# What changes are included in this PR?
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- Introduced *Stage* and *StageManager*
- Removed *SchedulerStateWatcher*, due to we have introduced event-based
processing mechanism for the state machine changes.
# Are there any user-facing changes?
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It's block by #1934
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