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366283961a
This patch adds a new SUBSCRIPTION parameter "origin". It specifies whether the subscription will request the publisher to only send changes that don't have an origin or send changes regardless of origin. Setting it to "none" means that the subscription will request the publisher to only send changes that have no origin associated. Setting it to "any" means that the publisher sends changes regardless of their origin. The default is "any". Usage: CREATE SUBSCRIPTION sub1 CONNECTION 'dbname=postgres port=9999' PUBLICATION pub1 WITH (origin = none); This can be used to avoid loops (infinite replication of the same data) among replication nodes. This feature allows filtering only the replication data originating from WAL but for initial sync (initial copy of table data) we don't have such a facility as we can only distinguish the data based on origin from WAL. As a follow-up patch, we are planning to forbid the initial sync if the origin is specified as none and we notice that the publication tables were also replicated from other publishers to avoid duplicate data or loops. We forbid to allow creating origin with names 'none' and 'any' to avoid confusion with the same name options. Author: Vignesh C, Amit Kapila Reviewed-By: Peter Smith, Amit Kapila, Dilip Kumar, Shi yu, Ashutosh Bapat, Hayato Kuroda Discussion: https://postgr.es/m/CALDaNm0gwjY_4HFxvvty01BOT01q_fJLKQ3pWP9=9orqubhjcQ@mail.gmail.com
35 lines
842 B
C
35 lines
842 B
C
/*-------------------------------------------------------------------------
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*
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* pgoutput.h
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* Logical Replication output plugin
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*
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* Copyright (c) 2015-2022, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/include/replication/pgoutput.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PGOUTPUT_H
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#define PGOUTPUT_H
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#include "nodes/pg_list.h"
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typedef struct PGOutputData
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{
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MemoryContext context; /* private memory context for transient
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* allocations */
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MemoryContext cachectx; /* private memory context for cache data */
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/* client-supplied info: */
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uint32 protocol_version;
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List *publication_names;
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List *publications;
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bool binary;
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bool streaming;
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bool messages;
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bool two_phase;
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char *origin;
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} PGOutputData;
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#endif /* PGOUTPUT_H */
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