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https://issues.apache.org/jira/browse/CASSANDRA-13890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854443#comment-17854443
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Ling Mao commented on CASSANDRA-13890:
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# Co-authored-by Jon Haddad, because some codes based on his patch above
# Exposing current compaction throughput to nodetool:
{*}_getcompactionthroughput_{*}/{*}_compactionstats_{*} and
metric({*}_cassandra_compaction_bytescompactedthroughput_count_{*})
# Current compaction throughput (1 minute) is more precise to react current
compaction throughput than five/fifteen one
# If you want the most precise, you can use the:
*_rate(cassandra_compaction_bytescompactedthroughput_count\{instance=~"$instance"}[$interval])_*
in the grafana
# The RateLimter for the compactions is actually on reads, but we don't need
to expose "read" keyword, that will confuse users and increase their
mental/cognition burden
# keep ratelimiter and metric together in the
{_}*compactionRateLimiterAcquire*{_}, otherwise every time it is called, we
would have to rely on external metrics, which can lead to oversight and
inaccurate metric
# _*bytescompactedthroughput*_ is the upper limit of the current compaction,
when a node is very intensive, it may cannot reach that capacity. Evaluating
the real-time actual compaction throughput is comprehensive and complex
> Expose current compaction throughput
> ------------------------------------
>
> Key: CASSANDRA-13890
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13890
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Tools
> Reporter: Jon Haddad
> Priority: Low
> Labels: lhf
> Fix For: 5.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Getting and setting the current compaction throughput limit is supported, but
> there's no means of knowing if the setting is actually making a difference.
> Let's expose the current throughput being utilized by Cassandra that's in the
> {{compactionRateLimiter}}
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