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Posted to user@storm.apache.org by ? ?? <wa...@outlook.com> on 2017/08/09 01:23:55 UTC

Stream groupings

Hi,

  1.  Is Partial Key grouping always preferable than Fields grouping?
  2.  Will Local or shuffle grouping cause load imbalance between tasks?

________________________________
wangchunchao@outlook.com

Re: Stream groupings

Posted by Bobby Evans <ev...@yahoo-inc.com>.

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, ? ?? <wa...@outlook.com> wrote:

#yiv6558257798 body {line-height:1.5;}#yiv6558257798 body {font-size:10.5pt;font-family:'Microsoft YaHei UI';color:rgb(0, 0, 0);line-height:1.5;}Hi,   
   - Is Partial Key grouping always preferable than Fields grouping?
   - Will Local or shuffle grouping cause load imbalance between tasks?

wangchunchao@outlook.com