Details
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Improvement
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Status: Open
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Major
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Resolution: Unresolved
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None
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None
Description
Drill optimistically executes all major fragments of a query. In some situations, this greedy behavior is too optimistic, which causes portions of the query to swamp the IO path too early, starving earlier phases of the query. Our RPC backpressure should help manage this. However, with a high level of parallelization, the back pressure is too lenient.