| From: | "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Zheng Li <zhengli10(at)gmail(dot)com>, li jie <ggysxcq(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Japin Li <japinli(at)hotmail(dot)com>, rajesh singarapu <rajesh(dot)rs0541(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Support logical replication of DDLs |
| Date: | 2023-02-16 19:43:16 |
| Message-ID: | d18b6fcd-6a93-63d7-6db7-8c0934b1ca67@postgresql.org |
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| Lists: | pgsql-general pgsql-hackers |
On 2/16/23 2:38 PM, Alvaro Herrera wrote:
> On 2023-Feb-16, Jonathan S. Katz wrote:
>
>> On 2/16/23 12:53 PM, Alvaro Herrera wrote:
>
>>> I don't think this is the fault of logical replication. Consider that
>>> for the backend server, the function source code is just an opaque
>>> string that is given to the plpgsql engine to interpret. So there's no
>>> way for the logical DDL replication engine to turn this into runnable
>>> code if the table name is not qualified.
>>
>> Sure, that's fair. That said, the example above would fall under a "typical
>> use case", i.e. I'm replicating functions that call tables without schema
>> qualification. This is pretty common, and as logical replication becomes
>> used for more types of workloads (e.g. high availability), we'll definitely
>> see this.
>
> Hmm, I think you're saying that replay should turn check_function_bodies
> off, and I think I agree with that.
Yes, exactly. +1
The docs seem to think that is the correct approach too:
"Set this parameter to off before loading functions on behalf of other
users"[1].
[1]
https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-CHECK-FUNCTION-BODIES
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