[wip][bugfix]when number of task shards larger than buffer number it shouldn't use sharedqueue #590
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Purpose
when then number of task's total shards is larger than buffer number it shouldn't use sharedqueue, otherwise AcquireBlock and MakeReader will never succeed, then the whole progress will be stuck.
Modifications
Test
set buffer number to 2, and load 5 blocks, it succeed finally.
How was this patch tested?