mirror of
https://github.com/neondatabase/neon.git
synced 2026-01-08 14:02:55 +00:00
68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
import psycopg2
|
|
|
|
pytest_plugins = ("fixtures.zenith_fixtures")
|
|
|
|
|
|
#
|
|
# Test multixact state after branching
|
|
# Now this test is very minimalistic -
|
|
# it only checks next_multixact_id field in restored pg_control,
|
|
# since we don't have functions to check multixact internals.
|
|
#
|
|
def test_multixact(pageserver, postgres, pg_bin, zenith_cli, base_dir):
|
|
# Create a branch for us
|
|
zenith_cli.run(["branch", "test_multixact", "empty"])
|
|
pg = postgres.create_start('test_multixact')
|
|
|
|
print("postgres is running on 'test_multixact' branch")
|
|
pg_conn = psycopg2.connect(pg.connstr())
|
|
pg_conn.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
|
|
cur = pg_conn.cursor()
|
|
|
|
cur.execute('''
|
|
CREATE TABLE t1(i int primary key);
|
|
INSERT INTO t1 select * from generate_series(1, 100);
|
|
''')
|
|
|
|
cur.execute('SELECT next_multixact_id FROM pg_control_checkpoint()')
|
|
next_multixact_id_old = cur.fetchone()[0]
|
|
|
|
# Lock entries in parallel connections to set multixact
|
|
nclients = 3
|
|
connections = []
|
|
for i in range(nclients):
|
|
con = psycopg2.connect(pg.connstr())
|
|
# Do not turn on autocommit. We want to hold the key-share locks.
|
|
con.cursor().execute('select * from t1 for key share')
|
|
connections.append(con)
|
|
|
|
# We should have a multixact now. We can close the connections.
|
|
for c in connections:
|
|
c.close()
|
|
|
|
# force wal flush
|
|
cur.execute('checkpoint')
|
|
|
|
cur.execute('SELECT next_multixact_id, pg_current_wal_flush_lsn() FROM pg_control_checkpoint()')
|
|
res = cur.fetchone()
|
|
next_multixact_id = res[0]
|
|
lsn = res[1]
|
|
|
|
# Ensure that we did lock some tuples
|
|
assert int(next_multixact_id) > int(next_multixact_id_old)
|
|
|
|
# Branch at this point
|
|
zenith_cli.run(["branch", "test_multixact_new", "test_multixact@" + lsn])
|
|
pg_new = postgres.create_start('test_multixact_new')
|
|
|
|
print("postgres is running on 'test_multixact_new' branch")
|
|
pg_new_conn = psycopg2.connect(pg_new.connstr())
|
|
pg_new_conn.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
|
|
cur_new = pg_new_conn.cursor()
|
|
|
|
cur_new.execute('SELECT next_multixact_id FROM pg_control_checkpoint()')
|
|
next_multixact_id_new = cur_new.fetchone()[0]
|
|
|
|
# Check that we restored pg_controlfile correctly
|
|
assert next_multixact_id_new == next_multixact_id
|