whatyouhide/xandra

Add ScyllaDB driver extensions

Closed this issue · 3 comments

dorlaor commented

Scylla enhances the CQL protocol with these two capabilities:

  • Cache hint
    Simply flag a query to BYPASS the cache. This way queries that
    just scan do not need to be kept in the database cache. That's trivial
    to implement

  • Shard awareness
    Scylla provides per-core topology information, this way the driver can
    send the query to the core that handles the range. It improves load balancing
    and reduces a shard hop. It's implemented by Python, Java, go, C++ drivers.

whatyouhide commented

Hey @dorlaor, thanks for the report! Those features sound great but @lexmag and I have no bandwidth right now to work on anything here. If you have consistent time to work on this and would be able to drive it to conclusion, I'd be happy to provide support, but otherwise we won't get these in for the time being :(

dorlaor commented

Once we'll have an Elixir fan in the neighborhood we'll point him/her towards this, sure

whatyouhide commented

BYPASS CACHE is a CQL-level functionality, so it requires no changes to the driver. I added a test to make sure we support it in e7c9143.

As for shard awareness, I opened #324 to track it. Closing this down then!