Best strategy for UPSERT SELECT in large table

[Pedro Boado]

Hi guys,

We are trying to populate a Phoenix table based on a 1:1 projection of
another table with around 15.000.000.000 records via an UPSERT SELECT in
phoenix client. We've noticed a very poor performance ( I suspect the
client is using a single-threaded approach ) and lots of issues with client
timeouts.

Is there a better way of approaching this problem?

Cheers!
Pedro