To my knowledge, scan is not parallel, hence the speed of queries of Impala, Phoenix, and other similar projects.
On Saturday, July 13, 2013, ch huang wrote: > hi ted ,for example i have a table with 10 regions, if i offer the > condition hit the data of 8 regions,is it different do it use oraginal scan > and use coprocessor? i know coprocessor can do it parallel for each region > ,but why the oraginal scan will slow than coprocessor? > > > > On Sat, Jul 13, 2013 at 7:36 PM, Ted Yu <yuzhih...@gmail.com<javascript:;>> > wrote: > > > Can you clarify your question a little bit ? > > > > That is, are you expecting parallel scan within region boundary or across > > boundaries ? > > > > Cheers > > > > On Jul 13, 2013, at 1:43 AM, ch huang <justlo...@gmail.com<javascript:;>> > wrote: > > > > > ATT > > > -- Sent from Gmail Mobile
