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Add optional pid parameter to pg_replication_origin_session_setup().

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Commit 216a784829 introduced parallel apply workers, allowing multiple
processes to share a replication origin. To support this,
replorigin_session_setup() was extended to accept a pid argument
identifying the process using the origin.

This commit exposes that capability through the SQL interface function
pg_replication_origin_session_setup() by adding an optional pid parameter.
This enables multiple processes to coordinate replication using the same
origin when using SQL-level replication functions.

This change allows the non-builtin logical replication solutions to
implement parallel apply for large transactions.

Additionally, an existing internal error was made user-facing, as it can
now be triggered via the exposed SQL API.

Author: Doruk Yilmaz <doruk@mixrank.com>
Author: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Euler Taveira <euler@eulerto.com>
Discussion: https://postgr.es/m/CAMPB6wfe4zLjJL8jiZV5kjjpwBM2=rTRme0UCL7Ra4L8MTVdOg@mail.gmail.com
Discussion: https://postgr.es/m/CAE2gYzyTSNvHY1+iWUwykaLETSuAZsCWyryokjP6rG46ZvRgQA@mail.gmail.com
This commit is contained in:
Amit Kapila
2025-09-19 05:38:40 +00:00
parent 8aac5923a3
commit 5b148706c5
11 changed files with 193 additions and 10 deletions
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79
contrib/test_decoding/expected/parallel_session_origin.out Normal file
View File

@@ -0,0 +1,79 @@
Parsed test spec with 2 sessions
starting permutation: s0_setup s0_is_setup s1_setup s1_is_setup s0_add_message s0_store_lsn s1_add_message s1_store_lsn s0_compare s0_reset s1_reset
step s0_setup: SELECT pg_replication_origin_session_setup('origin');
pg_replication_origin_session_setup
-----------------------------------
(1 row)
step s0_is_setup: SELECT pg_replication_origin_session_is_setup();
pg_replication_origin_session_is_setup
--------------------------------------
t
(1 row)
step s1_setup:
SELECT pg_replication_origin_session_setup('origin', pid)
FROM pg_stat_activity
WHERE application_name = 'isolation/parallel_session_origin/s0';
pg_replication_origin_session_setup
-----------------------------------
(1 row)
step s1_is_setup: SELECT pg_replication_origin_session_is_setup();
pg_replication_origin_session_is_setup
--------------------------------------
t
(1 row)
step s0_add_message:
SELECT 1
FROM pg_logical_emit_message(true, 'prefix', 'message on s0');
?column?
--------
1
(1 row)
step s0_store_lsn:
INSERT INTO local_lsn_store
SELECT 0, local_lsn FROM pg_replication_origin_status;
step s1_add_message:
SELECT 1
FROM pg_logical_emit_message(true, 'prefix', 'message on s1');
?column?
--------
1
(1 row)
step s1_store_lsn:
INSERT INTO local_lsn_store
SELECT 1, local_lsn FROM pg_replication_origin_status;
step s0_compare:
SELECT s0.lsn < s1.lsn
FROM local_lsn_store as s0, local_lsn_store as s1
WHERE s0.session = 0 AND s1.session = 1;
?column?
--------
t
(1 row)
step s0_reset: SELECT pg_replication_origin_session_reset();
pg_replication_origin_session_reset
-----------------------------------
(1 row)
step s1_reset: SELECT pg_replication_origin_session_reset();
pg_replication_origin_session_reset
-----------------------------------
(1 row)

3
contrib/test_decoding/expected/replorigin.out
View File

@@ -41,6 +41,9 @@ SELECT pg_replication_origin_create('regress_test_decoding: regression_slot');
SELECT pg_replication_origin_create('regress_test_decoding: regression_slot');
ERROR: duplicate key value violates unique constraint "pg_replication_origin_roname_index"
DETAIL: Key (roname)=(regress_test_decoding: regression_slot) already exists.
-- ensure inactive origin cannot be set as session one if pid is specified
SELECT pg_replication_origin_session_setup('regress_test_decoding: regression_slot', -1);
ERROR: cannot use PID -1 for inactive replication origin with ID 1
--ensure deletions work (once)
SELECT pg_replication_origin_create('regress_test_decoding: temp');
pg_replication_origin_create