On 2017-07-25 15:49 (-0700), Roger Warner <[email protected]> wrote: > This is a quick informational question. I know that Cassandra can detect > failures of nodes and repair them given replication and multiple DC. > > My question is can Cassandra tell if data was lost after a failure and > node(s) âfixedâ and resumed operation? >
Sorta concerned by the way you're asking this - Cassandra doesn't "fix" failed nodes. It can route requests around a down node, but the "fixing" is entirely manual. If you have a node go down temporarily, and it comes back up (with it's disk intact), you can see it "repair" data with a combination of active (anti-entropy) repair via nodetool repair, or by watching 'nodetool netstats' and see the read repair counters increase over time (which will happen naturally as data is requested and mismatches are detected in the data, based on your consistency level). --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
