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From Sebastian Estevez <sebastian.este...@datastax.com>
Subject Re: OpsCenter metrics growth can relates to compactions?
Date Mon, 21 Dec 2015 14:39:52 GMT
>
> We do have a lot of keyspaces and column families.


Be careful as c* (not just opscenter) will not run well with too many
tables. Usually 2 or 3 hundred is a good upper bound though I've seen folks
throw money at the problem and run more with special hardware (lots of RAM).

Most importantly, I truncated all rollups early this morning and during a
> big compaction (with hundreds of pending tasks at one point), the metrics
> grew to ~13G. Can I say compaction activities can increase the metric disk
> usage growth significantly? I have seen this behavior quite often with
> compaction.


This is normal especially with size tiered compaction.


Since it's metrics data, you can always decrease your ttl on the OpsCenter
tables, blacklist some keyspaces or tables, or keep truncating.

http://docs.datastax.com/en/opscenter/5.2/opsc/configure/opscMetricsConfig_r.html






All the best,


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Sebastián Estévez

Solutions Architect | 954 905 8615 | sebastian.estevez@datastax.com

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On Sun, Dec 20, 2015 at 3:45 PM, John Wong <gokoproject@gmail.com> wrote:

> Hi.
>
> We are using the open source version of OpsCenter. We find it useful, but
> the disk space for OpsCenter metrics has been increasing and can sometime
> outgrow to 30-50G in a matter of a day or two. We do have a lot of
> keyspaces and column families.
>
> Usually this dev cluster is quiet on the weekend except for some QA jobs
> or our weekend primary read-repair. Most importantly, I truncated all
> rollups early this morning and during a big compaction (with hundreds of
> pending tasks at one point), the metrics grew to ~13G. Can I say compaction
> activities can increase the metric disk usage growth significantly? I have
> seen this behavior quite often with compaction.
>
> Thanks.
>
> John
>

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