mirror of
https://github.com/neondatabase/neon.git
synced 2026-05-19 14:10:37 +00:00
ee8b5f967d
* Add fork_at_current_lsn function which creates branch at current LSN * Undo use of fork_at_current_lsn in test_branching because of short GC period * Add missed return in fork_at_current_lsn * Add missed return in fork_at_current_lsn * Update test_runner/fixtures/neon_fixtures.py Co-authored-by: Heikki Linnakangas <heikki@zenith.tech> * Update test_runner/fixtures/neon_fixtures.py Co-authored-by: Heikki Linnakangas <heikki@zenith.tech> * Update test_runner/fixtures/neon_fixtures.py Co-authored-by: Heikki Linnakangas <heikki@zenith.tech> Co-authored-by: Heikki Linnakangas <heikki@zenith.tech>
84 lines
2.9 KiB
Python
84 lines
2.9 KiB
Python
from fixtures.log_helper import log
|
|
from fixtures.neon_fixtures import NeonEnv, fork_at_current_lsn
|
|
|
|
|
|
#
|
|
# Test that the VM bit is cleared correctly at a HEAP_DELETE and
|
|
# HEAP_UPDATE record.
|
|
#
|
|
def test_vm_bit_clear(neon_simple_env: NeonEnv):
|
|
env = neon_simple_env
|
|
|
|
env.neon_cli.create_branch("test_vm_bit_clear", "empty")
|
|
pg = env.postgres.create_start("test_vm_bit_clear")
|
|
|
|
log.info("postgres is running on 'test_vm_bit_clear' branch")
|
|
pg_conn = pg.connect()
|
|
cur = pg_conn.cursor()
|
|
|
|
# Install extension containing function needed for test
|
|
cur.execute("CREATE EXTENSION neon_test_utils")
|
|
|
|
# Create a test table and freeze it to set the VM bit.
|
|
cur.execute("CREATE TABLE vmtest_delete (id integer PRIMARY KEY)")
|
|
cur.execute("INSERT INTO vmtest_delete VALUES (1)")
|
|
cur.execute("VACUUM FREEZE vmtest_delete")
|
|
|
|
cur.execute("CREATE TABLE vmtest_update (id integer PRIMARY KEY)")
|
|
cur.execute("INSERT INTO vmtest_update SELECT g FROM generate_series(1, 1000) g")
|
|
cur.execute("VACUUM FREEZE vmtest_update")
|
|
|
|
# DELETE and UPDATE the rows.
|
|
cur.execute("DELETE FROM vmtest_delete WHERE id = 1")
|
|
cur.execute("UPDATE vmtest_update SET id = 5000 WHERE id = 1")
|
|
|
|
# Branch at this point, to test that later
|
|
fork_at_current_lsn(env, pg, "test_vm_bit_clear_new", "test_vm_bit_clear")
|
|
|
|
# Clear the buffer cache, to force the VM page to be re-fetched from
|
|
# the page server
|
|
cur.execute("SELECT clear_buffer_cache()")
|
|
|
|
# Check that an index-only scan doesn't see the deleted row. If the
|
|
# clearing of the VM bit was not replayed correctly, this would incorrectly
|
|
# return deleted row.
|
|
cur.execute(
|
|
"""
|
|
set enable_seqscan=off;
|
|
set enable_indexscan=on;
|
|
set enable_bitmapscan=off;
|
|
"""
|
|
)
|
|
|
|
cur.execute("SELECT * FROM vmtest_delete WHERE id = 1")
|
|
assert cur.fetchall() == []
|
|
cur.execute("SELECT * FROM vmtest_update WHERE id = 1")
|
|
assert cur.fetchall() == []
|
|
|
|
cur.close()
|
|
|
|
# Check the same thing on the branch that we created right after the DELETE
|
|
#
|
|
# As of this writing, the code in smgrwrite() creates a full-page image whenever
|
|
# a dirty VM page is evicted. If the VM bit was not correctly cleared by the
|
|
# earlier WAL record, the full-page image hides the problem. Starting a new
|
|
# server at the right point-in-time avoids that full-page image.
|
|
pg_new = env.postgres.create_start("test_vm_bit_clear_new")
|
|
|
|
log.info("postgres is running on 'test_vm_bit_clear_new' branch")
|
|
pg_new_conn = pg_new.connect()
|
|
cur_new = pg_new_conn.cursor()
|
|
|
|
cur_new.execute(
|
|
"""
|
|
set enable_seqscan=off;
|
|
set enable_indexscan=on;
|
|
set enable_bitmapscan=off;
|
|
"""
|
|
)
|
|
|
|
cur_new.execute("SELECT * FROM vmtest_delete WHERE id = 1")
|
|
assert cur_new.fetchall() == []
|
|
cur_new.execute("SELECT * FROM vmtest_update WHERE id = 1")
|
|
assert cur_new.fetchall() == []
|