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Posted to commits@cassandra.apache.org by "Dmitry Konstantinov (Jira)" <ji...@apache.org> on 2025/12/11 22:20:00 UTC
[jira] [Updated] (CASSANDRA-21073) Make "active compaction remaining time" reported by nodetool compactionstats more accurate
[ https://issues.apache.org/jira/browse/CASSANDRA-21073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmitry Konstantinov updated CASSANDRA-21073:
--------------------------------------------
Change Category: Operability
Complexity: Low Hanging Fruit
Status: Open (was: Triage Needed)
> Make "active compaction remaining time" reported by nodetool compactionstats more accurate
> ------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21073
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21073
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Compaction, Tool/nodetool
> Reporter: Dmitry Konstantinov
> Priority: Normal
>
> Currently "active compaction remaining time" is calculated as
> {code:java}
> (total - completed)/ compaction_throughput{code}
> the real processing speed can be much lower that compaction_throughput configuration limit, so the value can be highly inaccurate.
> We can use some realtime information (rate or the time since a start of a compaction) to make the reported value more accurate.
> {code:java}
> ./bin/nodetool compactionstats -H
> concurrent compactors 1
> pending tasks 2
> stress stress_table 2
> compactions completed 10
> data compacted 14.82 GiB
> compactions aborted 0
> compactions reduced 0
> sstables dropped from compaction 0
> 15 minute rate 24.88/minute
> mean rate 100.63/hour
> compaction throughput (MiB/s) 1024.0
> current compaction throughput (1 minute) 47.052 MiB/s
> current compaction throughput (5 minute) 25.934 MiB/s
> current compaction throughput (15 minute) 10.843 MiB/s
> id compaction type keyspace table completed total unit progress
> c3b5c9d0-d6b9-11f0-b467-b1b09c3e4b2e Compaction stress stress_table 288.84 MiB 1.36 GiB bytes 20.74%
> active compaction remaining time 0h00m01s {code}
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