1.  PartialKeyGrouping is preferable is you have a data skew problem.  But it 
is not a drop in replacement.  You often need an extra layer of bolts to come 
up with the same answer in the end.2. Yes it can.  We are working on a better 
option that takes network distance and load into account when deciding where to 
send a message, but that is still a work in progress.

- Bobby

On Tuesday, August 8, 2017, 8:24:10 PM CDT, ? ?? <wangchunc...@outlook.com> 

#yiv6558257798 body {line-height:1.5;}#yiv6558257798 body 
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   - Is Partial Key grouping always preferable than Fields grouping?
   - Will Local or shuffle grouping cause load imbalance between tasks?


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