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Add 'logical_decoding_mode' GUC.

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This enables streaming or serializing changes immediately in logical
decoding. This parameter is intended to be used to test logical decoding
and replication of large transactions for which otherwise we need to
generate the changes till logical_decoding_work_mem is reached.

This helps in reducing the timing of existing tests related to logical
replication of in-progress transactions and will help in writing tests for
for the upcoming feature for parallelly applying large in-progress
transactions.

Author: Shi yu
Reviewed-by: Sawada Masahiko, Shveta Mallik, Amit Kapila, Dilip Kumar, Kuroda Hayato, Kyotaro Horiguchi
Discussion: https://postgr.es/m/OSZPR01MB63104E7449DBE41932DB19F1FD1B9@OSZPR01MB6310.jpnprd01.prod.outlook.com
This commit is contained in:
Amit Kapila
2022-12-26 08:58:16 +05:30
parent d3c0cc4447
commit 5de94a041e
9 changed files with 134 additions and 67 deletions
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17
src/backend/utils/misc/guc_tables.c
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@ -395,6 +395,12 @@ static const struct config_enum_entry ssl_protocol_versions_info[] = {
{NULL, 0, false}
};
static const struct config_enum_entry logical_decoding_mode_options[] = {
{"buffered", LOGICAL_DECODING_MODE_BUFFERED, false},
{"immediate", LOGICAL_DECODING_MODE_IMMEDIATE, false},
{NULL, 0, false}
};
StaticAssertDecl(lengthof(ssl_protocol_versions_info) == (PG_TLS1_3_VERSION + 2),
"array length mismatch");
@ -4877,6 +4883,17 @@ struct config_enum ConfigureNamesEnum[] =
NULL, NULL, NULL
},
{
{"logical_decoding_mode", PGC_USERSET, DEVELOPER_OPTIONS,
gettext_noop("Allows streaming or serializing each change in logical decoding."),
NULL,
GUC_NOT_IN_SAMPLE
},
&logical_decoding_mode,
LOGICAL_DECODING_MODE_BUFFERED, logical_decoding_mode_options,
NULL, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL, NULL