After the second phase of the CEP, we will have two optimizer
implementations. One will be similar to what we have today and the other
one will be the CBO. As those implementations will be behind the new
Optimizer API interfaces they will both have support for EXPLAIN and they
will both benefit fro
If we are to address that within the CEP itself then we should discuss it here, as I would like to fully understand the approach as well as how it relates to consistency of execution and the idea of triggering re-optimisation. These ideas are all interrelated.I’m not sold on the proposed set of cha
>
> If we are to address that within the CEP itself then we should discuss it
> here, as I would like to fully understand the approach as well as how it
> relates to consistency of execution and the idea of triggering
> re-optimisation.
Sure, that was my plan.
I’m not sold on the proposed set of
I see three options:Pick a random replica and ask it to prepare it, and use that. This is probably fine, unless there is significant skew (in which case, our plan is likely to bad whatever, somewhere)If there already exists a plan for the query, return thatPick a sample of replicas and eitherAsk th
Thanks for this proposal and apologies for my delayed engagement during the Cassandra Summit last week. Benjamin, I appreciate your work on this and your engagement on this thread – I know it’s a lot of discussion to field. On ALLOW FILTERING: I share Chris Lohfink’s
experience in operating clust
Thanks for this proposal and apologies for my delayed engagement during the Cassandra Summit last week. Benjamin, I appreciate your work on this and your engagement on this thread – I know it’s a lot of discussion to field.On ALLOW FILTERING:I share Chris Lohfink’s experience in operating clusters
>
> Pick a random replica and ask it to prepare it, and use that. This is
> probably fine, unless there is significant skew (in which case, our plan is
> likely to bad whatever, somewhere)
To be sure that I understand you correctly. What you are suggesting is to
use local statistics to compute th
Hi,
we once did some extensive performance testing on the row cache (motivated by
some hardware accelerator we were hoping to introduce) but could only find
improvements in highly contrived scenarios - has been a while since then so
fresh eyes are good but I think we will still arrive at the c
