On Thu, Sep 2, 2010 at 6:25 PM, Mike Peters <cassan...@softwareprojects.com> wrote: > > My concerns are - > #1. Will every single node end up with 4k folders under /cassandra/data/? >
Yes (and you should review how Cassandra works if that is a question for you). > #2. Performance: Will Cassandra work better with a single keyspace + lots of > keys, or thousands of keyspaces? > Thousands is a non-starter. There is an active memtable for every CF defined and caches (row and key) are per CF. Assuming even 2 CFs per keyspace, with 4000 keyspaces you will have 8000 active memtables, 8000 _sets_ of sstables to be compacted, etc. Put everyone in the same keyspace, use a prefix on keys to distinguish different clients. b
