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723c0971e8
Now that we've given up hope on sharing the neon_simple_env between tests, there's no reason to not use the 'main' branch directly.
83 lines
2.6 KiB
Python
83 lines
2.6 KiB
Python
import os
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from fixtures.log_helper import log
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from fixtures.neon_fixtures import NeonEnv, fork_at_current_lsn
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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(neon_simple_env: NeonEnv):
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env = neon_simple_env
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endpoint = env.endpoints.create_start("main", config_lines=["max_prepared_transactions=5"])
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conn = endpoint.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(endpoint.pg_twophase_dir_path())
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log.info(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(endpoint.pg_twophase_dir_path())
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log.info(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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fork_at_current_lsn(env, endpoint, "test_twophase_prepared", "main")
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# Start compute on the new branch
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endpoint2 = env.endpoints.create_start(
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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(endpoint2.pg_twophase_dir_path())
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log.info(twophase_files2)
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assert twophase_files2.sort() == twophase_files.sort()
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conn2 = endpoint2.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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