Atomicity and isolation are only guaranteed within a replica. If you have
multiple concurrent requests across replicas last timestamp will win. You
can get better isolation using LWT which uses paxos under the hood.

On 16 May 2018 at 08:55, Rajesh Kishore <> wrote:

> Hi,
> I am just curious to know when Cassandra doc says the atomicity and
> isolation is guaranteed for a row.
> Does it mean, two requests updating a row- "R1" at different replica will
> be candidate for atomicity and isolation?
> For instance , I have a setup where RF is 2
> I have a client application where two requests of updating a particular
> row #R1 goes to two coordinator nodes at same time.
> Row "R1" has presence in nodes - N1, N2 (since RF is 2)
> Does Cassandra ensure atomicity & isolation across replicas/partition for
> a particular row? If so , then how does it get handled does Cassandra
> follows 2 Phase commit txn for a row or Cassandra uses distributed lock for
> a row?
> Thanks,
> Rajesh

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