Re: pglogical vs. built-in logical replication in pg-10

On 2017-06-22 12:43:02 +0300, Achilleas Mantzios wrote:
> On 22/06/2017 11:21, Andreas Joseph Krogh wrote:
> > Hi.
> > 1. Why should one prefer built-in logical replication in pg-10 to pglogical, does it do anything pglogical doesn't?
> > It seems pglogical is more feature-rich...
> > 2. As I understand built-in logical replication in pg-10 doesn't support
> > large-objects, which we use a lot. Does pglogical replicate large
> > objects? I cannot find any notes about large-objects under "Limitations
> > and Restrictions":
> > https://www.2ndquadrant.com/en/resources/pglogical/pglogical-docs/

> You may do a simple test, create a table with a largeobject and try to read
> the logical stream, if it cannot represent the lo_import, lo_open, lowrite,
> lo_close (and I 'd bet they can't be encoded) then neither pglogical (being
> based on the same logical decoding technology) will support them.

There's nothing fundamental preventing us supporting large objects , but
indeed logical decoding at the moment doesn't support it. The technical
bits of extracting changes should actually be easy, it's a bit more
difficult to decide how to represent it to output plugins...

Greetings,

Andres Freund