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https://issues.apache.org/jira/browse/CASSANDRA-18305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17736236#comment-17736236
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Stefan Miklosovic commented on CASSANDRA-18305:
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[~bschoeni] would you mind if mean rate would be {_}per hour{_}?
If you prefer it per minute, I still want to have a possibility to have it per
hour without multiplying it by 60 again in my head. We may have a flag for it.
If mean rate per hour is OK for you we can do it like that and drop the flag.
Cassandra is a process which is meant to be run non-stop and if an operator
wants to see how are compactions going, I doubt the metric "per minute" for
mean rate is useful. I think that extrapolating that number to represent mean
number of compactions per hour is more telling.
> Enhance nodetool compactionstats with existing MBean metrics
> ------------------------------------------------------------
>
> Key: CASSANDRA-18305
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18305
> Project: Cassandra
> Issue Type: Improvement
> Components: Tool/nodetool
> Reporter: Brad Schoening
> Assignee: Manish Ghildiyal
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.x
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Nodetool compactionstats reports only on active compactions, if nothing is
> active, you see only:
> {quote}$nodetool compactionstats
> pending tasks: 0
> {quote}
> but in the MBean Compaction/TotalCompactionsCompleted there are recent
> statistic in events/second for:
> * Count
> * FifteenMinueRate
> * FiveMinueRate
> * MeanRate
> * OneMinuteRate
> 1) It would be useful to see in addition:
> {quote}pending tasks: 0
> compactions completed: 20
> 1 minute rate: 0/second
> 5 minute rate: 2.3/second
> 15 minute rate: 4.6/second
> {quote}
> 2) Since compaction_throughput_mb_per_sec is a throttling parameter in
> cassandra.yaml (default 64 MBps), it would be nice to show the actual
> compaction throughput and be able to observe if you're close to the limit.
> I.e.,
> {quote}compaction throughput 13.2 MBps / 16 MBps (82.5%)
> {quote}
> 3) for completness, compactionstats should list the number of concurrent
> compactors configured, perhaps simply add to existing 'pending tasks' line:
> {quote}4 concurrent compactors, 0 pending tasks
> {quote}
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