Ok, I got. And in general, region which has no R/W requests doesn't consume ny resources except record in META?
2014-10-14 13:42 GMT+04:00 Ted Yu <[email protected]>: > In 0.94, load balancer doesn't take load each region receives into > account. It only considers the number of regions as the sole criteria for > balancing. > > Thus the high number of unused regions may cause imbalance. > > Please consider reducing unused regions. > > Cheers > > On Oct 14, 2014, at 2:33 AM, Serega Sheypak <[email protected]> > wrote: > > > We are using CDH 4.6 (hbase-0.94.15+86) > > Regions are balanced. > > - Read/write request are pretty even, > > - count or regions per RegionServer is pretty even. > > - there are no "hot spots" > > > > > > 2014-10-14 12:50 GMT+04:00 Qiang Tian <[email protected]>: > > > >> region unbalanced? > >> which hbase release? > >> > >> > >> On Tue, Oct 14, 2014 at 3:39 PM, Serega Sheypak < > [email protected]> > >> wrote: > >> > >>> Hi, we have 10 nodes cluster with 10HDD, 256 GB RAM and 10HDD 3TB each. > >>> Suddenly we met write perfomance issues. > >>> > >>> Our workload is: > >>> 1. We have 100+ region table for write load. It has constant set of > keys > >>> (~6* 10^7) and we write "updates". No versions or stuff like that > >>> 2. We have several read-only tables, theirs size could be from 1 egion > up > >>> to 256 regions. > >>> 3. We have several non-used tables theirs size could be from 1 region > up > >>> to 256 regions. These tables are previous versions of read-only tables. > >>> > >>> Right now each RegionServer serves >100 regions, but only half of them > >> are > >>> active. Really nothing changed for the last few weeks, we got more > >> non-used > >>> tables, but quantity on active read-only tables is the same, single > >>> wirte-only table dodn't get more bytes to write. > >>> > >>> Can big count of non-used(!!!) regions affect write/read perfomance for > >>> tables which are in use. > >> >
