Is it 2.0.14 or 2.1.4? If you are on 2.1.4 I would recommend an upgrade to 2.1.5 regardless of that issue.

From the data you provide it is difficult to access what is the issue. If you are running with RF=2 you can always add another node and kill that one if that is the only node that shows that problem. With 40GB load is not a big issue.


Carlos Juzarte Rolo
Cassandra Consultant
Pythian - Love your data

rolo@pythian | Twitter: cjrolo | Linkedin: linkedin.com/in/carlosjuzarterolo
Mobile: +31 6 159 61 814 | Tel: +1 613 565 8696 x1649

On Mon, Jun 8, 2015 at 4:04 AM, Arturas Raizys <arturas@noantidot.com> wrote:

> Does `nodetool comactionstats` show nothing running as well? Also, for
> posterity what are some details of the setup (C* version, etc.)?

`nodetool comactionstats` does not return anything, it just waits.
If I do enable DEBUG logging, I see this line poping up while executing
`nodetool compactionstats` :
DEBUG [RMI TCP Connection(1856)-] 2015-06-08 09:29:46,043
LeveledManifest.java:680 - Estimating [0, 0, 0, 0, 0, 0, 0, 0, 0]
compactions to do for system.paxos

I'm running Cassandra 2.1.14 with 7 node cluster. We're using small VM
with 8GB of ram and SSD. Our data size per node with RF=2 is ~40GB. Load
is ~ 1000 writes/second. Most of the data TTL is 2weeks.