Hello,
I have a 2 DCs on my cluster,
I have 2 questions:
1. Is it enough to enable the nodesync on all Keyspaces without running repairs?
2. Can I enable the nodesync on all Keyspaces + running repairs continiously from Opscenter?
Regards
Salah
You should run either one or the other, not both. I typically recommend running nodesync in low write workloads, but repair in high write workloads. The reason is that nodesync uses the read/write path, but repair uses streaming so it's not on the same path as your reads or writes.
In answer to your questions:
1) Yes, it's enough to enable nodesync and not repairs on the tables.
2) I would not run both. Choose one technology or the other.
NodeSync is a new feature in DataStax Enterprise which runs a repair continuously in the background using the same mechanism as read-repairs and replaces the traditional anti-entropy repairs.
The OpsCenter Repair Service (which runs anti-entropy repairs) will skip repairs on tables which have NodeSync enabled because it isn't possible to run traditional repairs on them as I've explained in question #3879.
We don't recommend you enable Nodesync for all keyspaces, just your application's keyspace because by default, Nodesync can only be enabled on a maximum of 50 tables.
For more information, see Nodesync Service versus Repair Service. Cheers!
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