Dmitry Konstantinov created CASSANDRA-21073:
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Summary: 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
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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