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. > > >
