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.
