On Thu, Feb 25, 2016 at 01:53:12PM +0900, Michael Paquier wrote: > > Well, as far as I know XC doesn't support data redistribution between > > nodes and I saw good benchmarks of that, as well as XL. > > XC does support that in 1.2 with a very basic approach (coded that > years ago), though it takes an exclusive lock on the table involved. > And actually I think what I did in this case really sucked, the effort > was centralized on the Coordinator to gather and then redistribute the > tuples, at least tuples that do not need to move were not moved at > all.
Yes, there is a lot of complexity involved in sending results between nodes. > >> Once that is done, we can see what workloads it covers and > >> decide if we are willing to copy the volume of code necessary > >> to implement all supported Postgres XC or XL workloads. > >> (The Postgres XL license now matches the Postgres license, > >> http://www.postgres-xl.org/2015/07/license-change-and-9-5-merge/. > >> Postgres XC has always used the Postgres license.) > > Postgres-XC used the GPL license first, and has moved to PostgreSQL > license exactly to allow Postgres core to reuse it later on if needed. Ah, yes, I remember that now. Thanks. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + As you are, so once was I. As I am, so you will be. + + Roman grave inscription + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
