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Is it possible to be notified when data is updated in Cassandra?
I.e. when changes to a node have been replicated in from another node?
Could I do this directly using Gossip, or is there a higher level abstraction?
No.
Gossip isn’t something to be relied on. The Cassandra nodes themselves don’t rely on it for guarantees. (e.g. if a node is down then updates are queued for an hour only). This is also why you need to run
nodetool repairregularly.Neither does Cassandra have triggers.
I recommend you do update tracking in your application.