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Add support for temporary replication slots

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This allows creating temporary replication slots that are removed
automatically at the end of the session or on error.

From: Petr Jelinek <petr.jelinek@2ndquadrant.com>
This commit is contained in:
Peter Eisentraut
2016-12-08 12:00:00 -05:00
parent e7f051b8f9
commit a924c327e2
18 changed files with 237 additions and 51 deletions
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2
contrib/test_decoding/Makefile
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@ -39,7 +39,7 @@ submake-test_decoding:
REGRESSCHECKS=ddl xact rewrite toast permissions decoding_in_xact \
decoding_into_rel binary prepared replorigin time messages \
spill
spill slot
regresscheck: | submake-regress submake-test_decoding temp-install
$(MKDIR_P) regression_output

4
contrib/test_decoding/expected/ddl.out
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@ -702,7 +702,7 @@ SELECT pg_drop_replication_slot('regression_slot');
/* check that the slot is gone */
SELECT * FROM pg_replication_slots;
slot_name | plugin | slot_type | datoid | database | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn
-----------+--------+-----------+--------+----------+--------+------------+------+--------------+-------------+---------------------
slot_name | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn
-----------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+-------------+---------------------
(0 rows)

58
contrib/test_decoding/expected/slot.out Normal file
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@ -0,0 +1,58 @@
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_p', 'test_decoding');
?column?
----------
init
(1 row)
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_t', 'test_decoding', true);
?column?
----------
init
(1 row)
SELECT pg_drop_replication_slot('regression_slot_p');
pg_drop_replication_slot
--------------------------
(1 row)
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_p', 'test_decoding', false);
?column?
----------
init
(1 row)
-- reconnect to clean temp slots
\c
SELECT pg_drop_replication_slot('regression_slot_p');
pg_drop_replication_slot
--------------------------
(1 row)
-- should fail because the temporary slot was dropped automatically
SELECT pg_drop_replication_slot('regression_slot_t');
ERROR: replication slot "regression_slot_t" does not exist
-- test switching between slots in a session
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot1', 'test_decoding', true);
?column?
----------
init
(1 row)
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot2', 'test_decoding', true);
?column?
----------
init
(1 row)
SELECT * FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL);
location | xid | data
----------+-----+------
(0 rows)
SELECT * FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL);
location | xid | data
----------+-----+------
(0 rows)

20
contrib/test_decoding/sql/slot.sql Normal file
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@ -0,0 +1,20 @@
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_p', 'test_decoding');
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_t', 'test_decoding', true);
SELECT pg_drop_replication_slot('regression_slot_p');
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_p', 'test_decoding', false);
-- reconnect to clean temp slots
\c
SELECT pg_drop_replication_slot('regression_slot_p');
-- should fail because the temporary slot was dropped automatically
SELECT pg_drop_replication_slot('regression_slot_t');
-- test switching between slots in a session
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot1', 'test_decoding', true);
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot2', 'test_decoding', true);
SELECT * FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL);
SELECT * FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL);