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5b148706c5
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
57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
# Test parallel replication origin manipulations; ensure local_lsn can be
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# updated by all attached sessions.
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setup
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{
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SELECT pg_replication_origin_create('origin');
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CREATE UNLOGGED TABLE local_lsn_store (session int, lsn pg_lsn);
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}
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teardown
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{
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SELECT pg_replication_origin_drop('origin');
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DROP TABLE local_lsn_store;
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}
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session "s0"
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setup { SET synchronous_commit = on; }
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step "s0_setup" { SELECT pg_replication_origin_session_setup('origin'); }
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step "s0_is_setup" { SELECT pg_replication_origin_session_is_setup(); }
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step "s0_add_message" {
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SELECT 1
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FROM pg_logical_emit_message(true, 'prefix', 'message on s0');
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}
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step "s0_store_lsn" {
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INSERT INTO local_lsn_store
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SELECT 0, local_lsn FROM pg_replication_origin_status;
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}
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step "s0_compare" {
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SELECT s0.lsn < s1.lsn
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FROM local_lsn_store as s0, local_lsn_store as s1
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WHERE s0.session = 0 AND s1.session = 1;
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}
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step "s0_reset" { SELECT pg_replication_origin_session_reset(); }
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session "s1"
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setup { SET synchronous_commit = on; }
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step "s1_setup" {
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SELECT pg_replication_origin_session_setup('origin', pid)
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FROM pg_stat_activity
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WHERE application_name = 'isolation/parallel_session_origin/s0';
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}
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step "s1_is_setup" { SELECT pg_replication_origin_session_is_setup(); }
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step "s1_add_message" {
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SELECT 1
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FROM pg_logical_emit_message(true, 'prefix', 'message on s1');
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}
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step "s1_store_lsn" {
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INSERT INTO local_lsn_store
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SELECT 1, local_lsn FROM pg_replication_origin_status;
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}
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step "s1_reset" { SELECT pg_replication_origin_session_reset(); }
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# Firstly s0 attaches to a origin and s1 attaches to the same. Both sessions
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# commits a transaction and store the local_lsn of the replication origin.
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# Compare LSNs and expect latter transaction (done by s1) has larger local_lsn.
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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"
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