[arielweisberg]

Shameless plug (hey Tokutek is doing it), in VoltDB replication is synchronous so it doesn't have this problem.

Latency in the current version is nothing to write home about, but in V3 latency with replication is 600-1000 microseconds. Group commit to disk is every 1-2 milliseconds.

V3 also allows reads to be load balanced across replicas and masters so you gain some additional read capacity from replication. V3 also routes transactions directly to the node with the data so you don't use capacity forwarding transactions inside the cluster.

You get to keep transactions to. Now go figure out what you don't get to keep ;-)

[lmm]

>Now go figure out what you don't get to keep ;-)

Cross-datacenter replication becomes a Really Bad Idea?

[arielweisberg]

You don't have to give up cross DC replication if you do it asynchronously, but you lose cross shard consistency when there is a dirty fail over. This effects distributed transactions and series of single part transactions that depend on each other across different shards.

What Volt supports right now is actually asynchronous replication that does preserve cross shard consistency, but that is not going to last.

You can do synchronous multi-DC replication, but then you have Spanner and the associated latency of multiple data-center quorums.

There is also Calvin http://bit.ly/RGW9RY