Fix Version/s: None
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:
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.