On Wed, Feb 13, 2019 at 4:40 PM Jeff Jirsa <jji...@gmail.com> wrote: > Some people who add new hosts rebalance the ring afterward - that > rebalancing can look a lot like a shrink. >
You mean by moving the tokens? That's only possible if one is not using vnodes, correct? I also believe, but don’t have time to prove, that enough new hosts can > eventually give you a range back (moving it all the way around the ring) - > less likely but probably possible. > > Easiest to just assume that any range movement may resurrect data if you > haven’t run cleanup. > Does this mean that it is recommended to run cleanup on all hosts after every single node added? We currently do this after every 3 or 6 nodes (1 or 2 new per rack), to minimize the number of times we have to rewrite the sstable files. Arguably, we don't do explicit deletes, the data is only expiring due to TTL, so this should not be a problem for us, but in general? -- Alex
