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Prototype of new scheduler #218

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Prototype of new scheduler #218

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swjz
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@swjz swjz commented Jul 23, 2018

Hi Alex,

scanner/engine/scheduler.h contains my prototype of the new scheduler. Please take a look and let me know if you have any comments.

This means, we can now use Amazon S3 to store inputs & outputs of each task!

Known issue: local memory reference counts might not be consistent because
they are not included in serialized EvalWorkEntry, and thus later tasks/ops
are not aware of these existing reference counts.
and column size wider than task size

When grabbing source task, we assume the source task only has one output
column and it is the last one fed into EvalWorkEntry.
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