One tunable is the scanner caching, which is available in this call: http://hadoop.apache.org/hbase/docs/r0.20.3/api/org/apache/hadoop/hbase/client/HTable.html#setScannerCaching(int)
-ryan On Fri, Feb 5, 2010 at 1:11 PM, Gabriel Ki <gab...@gmail.com> wrote: > In page 3 of > http://www.slideshare.net/schubertzhang/hbase-0200-performance-evaluation, > for 0.20.0 > random reads: 1106, sequential reads: 5433. It is about 1 to 5. > > In the wiki, http://wiki.apache.org/hadoop/Hbase/PerformanceEvaluation, for > 0.19.0RC1 > random reads: 540, sequential reads: 464. It is about 1 to 1. > > I was doing similar performance evaluation against hbase 0.20.3 hadoop > 0.20.1. I did not get as good sequential read as that and would like to > know the interesting fact what has changed from 0.19.0RC1 to 0.20.x to make > that improvement. > > Thanks, > -gabe > > > On Thu, Feb 4, 2010 at 10:58 PM, Stack <st...@duboce.net> wrote: > >> On Wed, Feb 3, 2010 at 3:58 PM, Gabriel Ki <gab...@gmail.com> wrote: >> > Hi, >> > >> > I was reading >> > >> http://www.slideshare.net/schubertzhang/hbase-0200-performance-evaluation. >> > Could someone explain what has changed to improve the random reads to >> > sequential reads ratio from 1:1 to 1:5? I don't seem to reproduce such >> good >> > sequential reads. >> > >> Which slide is that Gabriel? Its saying that we do 5 sequential reads >> per random read? What are you seeing? Why not scan instead of do >> sequential reads? >> >> St.Ack >> >
