We have upgraded from dse4.5 to dse4.8 . After running upgrade sstables on 4 nodes of my 10 node cluster , i see the size of my cluster shown in opscenter is reduced to 2.5TB from 3.2TB . However , there is no impact of it in production. Does the data really get compressed or reduce in size after upgrading sstables ?
Answer posted by markc in the comment : Compaction might play a part here you may have had pending compactions prior to the upgrade which have now completed. Snapshots will be under the data directory too, upgrade sstables will upgrade those too iirc. – markc Feb 23 at 12:19