Elliott Sims created CASSANDRA-14587:
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Summary: TrueDiskSpaceUsed overcounts snapshots
Key: CASSANDRA-14587
URL: https://issues.apache.org/jira/browse/CASSANDRA-14587
Project: Cassandra
Issue Type: Bug
Components: Tools
Environment: Debian 8
Cassandra 3.11.2
Reporter: Elliott Sims
Running 'nodetool listsnapshots' seems to overcount "TrueDiskSpaceUsed" under
some circumstances. Specifically when there's a large number of snapshots. I
suspect that it's not deduplicating space used when multiple snapshots share
sstables that are not part of the current table.
Results of "nodetool listsnapshots":
Total TrueDiskSpaceUsed: 396.11 MiB
Results of "du -hcs" on the table's directory:
18M total
This is 50+ snapshots (every minute) run with "-t <datestamp> -sf
--column-family <tablename> <keyspace>"
The results of a "du -hcs -L <directory" come out pretty close to the
"TrueDiskSpaceUsed"
I have only tested against 3.11.2, but have no reason to believe it's unique to
that version or even 3.x.
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