well you can either use a single database for log entries, or cassandra or a mysql cluster or a pg cluster. that doesn't matter..
basially instead of having a table where you update/delete entries you basically append only to a table. so insert only.
you can still have another table that will be aggregated from your log table.
where you store (i.e. which database system, cluster whatever) your stuff doesn't matter.
That doesn't answer my question. If you're appending to the end of a table, regardless of system you still need one machine somewhere to ingest new records for the same primary key, right?
where you store (i.e. which database system, cluster whatever) your stuff doesn't matter.