You're welcome.
On Wed, Jan 22, 2014 at 3:03 PM, Tianying Chang <[email protected]> wrote: > Thanks Ted, This jira helped me to understand that claim much better now. > > > On Wed, Jan 22, 2014 at 1:10 PM, Ted Yu <[email protected]> wrote: > > > For the follow-on question of #1, see HBASE-9488 : small scan. > > > > Cheers > > > > > > On Wed, Jan 22, 2014 at 10:30 AM, Tianying Chang <[email protected]> > > wrote: > > > > > Ted, Thanks for link! > > > > > > 1. the post said "Get will pread from HDFS where Scan will seek and > read > > > under lock (and only fall back to pread when it notices contention on > the > > > hfile)." It seems pread is for highly concurrent small readers. So > this > > > brings me a new question: does this mean that if my scan > startKey/endKey > > > only covers 10 rows, it is faster to run a getMultiple()??? > > > > > > > > > 2. Still confused why Tall is good for Scans, wide is good for Gets? I > > > thought the underlying storage is stored in KV. so tall or wide > shouldn't > > > matter, right? > > > > > > Thanks > > > Tian-Ying > > > > > > > > > On Wed, Jan 22, 2014 at 10:12 AM, Ted Yu <[email protected]> wrote: > > > > > > > See > > > > > > > > > > > > > > http://search-hadoop.com/m/nAAad2wRi03/Is+get+a+private+case+of+scan&subj=Re+Is+get+a+private+case+of+scan+ > > > > > > > > Cheers > > > > > > > > > > > > On Wed, Jan 22, 2014 at 10:09 AM, Tianying Chang <[email protected]> > > > > wrote: > > > > > > > > > Hi, > > > > > > > > > > I watched this youtube video > > > http://www.youtube.com/watch?v=_HLoH_PgrLkby > > > > > Lars George. It is really good one! > > > > > > > > > > I just have one thing still cannot understand. It said Tall is good > > for > > > > > Scan, Wide is good for Get. My understanding is that Scan and Get > is > > > > using > > > > > the same code underlying. It first seek to the specific kv, check > > data, > > > > > after done, then do next() . Considering the underlying storage is > > same > > > > for > > > > > wide or tall, and the code to do scan/get is the same. why Tall is > > good > > > > for > > > > > Scan, and wide is good for Get? > > > > > > > > > > Does anyone know why? This really puzzles me. > > > > > > > > > > Thanks a lot! > > > > > Tian-Ying > > > > > > > > > > > > > > >
