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89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
import os
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from fixtures.zenith_fixtures import PostgresFactory, ZenithPageserver
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pytest_plugins = ("fixtures.zenith_fixtures")
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#
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# Test branching, when a transaction is in prepared state
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#
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def test_twophase(zenith_cli, pageserver: ZenithPageserver, postgres: PostgresFactory, pg_bin):
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zenith_cli.run(["branch", "test_twophase", "empty"])
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pg = postgres.create_start('test_twophase', config_lines=['max_prepared_transactions=5'])
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print("postgres is running on 'test_twophase' branch")
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conn = pg.connect()
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cur = conn.cursor()
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cur.execute('CREATE TABLE foo (t text)')
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# Prepare a transaction that will insert a row
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cur.execute('BEGIN')
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cur.execute("INSERT INTO foo VALUES ('one')")
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cur.execute("PREPARE TRANSACTION 'insert_one'")
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# Prepare another transaction that will insert a row
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cur.execute('BEGIN')
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cur.execute("INSERT INTO foo VALUES ('two')")
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cur.execute("PREPARE TRANSACTION 'insert_two'")
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# Prepare a transaction that will insert a row
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cur.execute('BEGIN')
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cur.execute("INSERT INTO foo VALUES ('three')")
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cur.execute("PREPARE TRANSACTION 'insert_three'")
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# Prepare another transaction that will insert a row
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cur.execute('BEGIN')
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cur.execute("INSERT INTO foo VALUES ('four')")
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cur.execute("PREPARE TRANSACTION 'insert_four'")
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# On checkpoint state data copied to files in
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# pg_twophase directory and fsynced
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cur.execute('CHECKPOINT')
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twophase_files = os.listdir(pg.pg_twophase_dir_path())
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print(twophase_files)
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assert len(twophase_files) == 4
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cur.execute("COMMIT PREPARED 'insert_three'")
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cur.execute("ROLLBACK PREPARED 'insert_four'")
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cur.execute('CHECKPOINT')
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twophase_files = os.listdir(pg.pg_twophase_dir_path())
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print(twophase_files)
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assert len(twophase_files) == 2
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# Create a branch with the transaction in prepared state
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zenith_cli.run(["branch", "test_twophase_prepared", "test_twophase"])
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# Create compute node, but don't start.
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# We want to observe pgdata before postgres starts
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pg2 = postgres.create(
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'test_twophase_prepared',
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config_lines=['max_prepared_transactions=5'],
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)
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# Check that we restored only needed twophase files
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twophase_files2 = os.listdir(pg2.pg_twophase_dir_path())
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print(twophase_files2)
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assert twophase_files2.sort() == twophase_files.sort()
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pg2 = pg2.start()
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conn2 = pg2.connect()
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cur2 = conn2.cursor()
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# On the new branch, commit one of the prepared transactions,
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# abort the other one.
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cur2.execute("COMMIT PREPARED 'insert_one'")
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cur2.execute("ROLLBACK PREPARED 'insert_two'")
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cur2.execute('SELECT * FROM foo')
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assert cur2.fetchall() == [('one',), ('three',)]
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# Only one committed insert is visible on the original branch
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cur.execute('SELECT * FROM foo')
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assert cur.fetchall() == [('three',)]
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