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75 lines
2.7 KiB
Python
75 lines
2.7 KiB
Python
import time
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import os
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from contextlib import closing
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from fixtures.zenith_fixtures import ZenithEnv
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from fixtures.log_helper import log
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#
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# Test compute node start after clog truncation
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#
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def test_clog_truncate(zenith_simple_env: ZenithEnv):
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env = zenith_simple_env
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env.zenith_cli.create_branch("test_clog_truncate", "empty")
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# set agressive autovacuum to make sure that truncation will happen
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config = [
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'autovacuum_max_workers=10',
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'autovacuum_vacuum_threshold=0',
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'autovacuum_vacuum_insert_threshold=0',
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'autovacuum_vacuum_cost_delay=0',
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'autovacuum_vacuum_cost_limit=10000',
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'autovacuum_naptime =1s',
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'autovacuum_freeze_max_age=100000'
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]
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pg = env.postgres.create_start('test_clog_truncate', config_lines=config)
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log.info('postgres is running on test_clog_truncate branch')
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# Install extension containing function needed for test
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pg.safe_psql('CREATE EXTENSION zenith_test_utils')
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# Consume many xids to advance clog
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with closing(pg.connect()) as conn:
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with conn.cursor() as cur:
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cur.execute('select test_consume_xids(1000*1000*10);')
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log.info('xids consumed')
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# call a checkpoint to trigger TruncateSubtrans
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cur.execute('CHECKPOINT;')
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# ensure WAL flush
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cur.execute('select txid_current()')
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log.info(cur.fetchone())
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# wait for autovacuum to truncate the pg_xact
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# XXX Is it worth to add a timeout here?
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pg_xact_0000_path = os.path.join(pg.pg_xact_dir_path(), '0000')
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log.info(f"pg_xact_0000_path = {pg_xact_0000_path}")
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while os.path.isfile(pg_xact_0000_path):
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log.info(f"file exists. wait for truncation. " "pg_xact_0000_path = {pg_xact_0000_path}")
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time.sleep(5)
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# checkpoint to advance latest lsn
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with closing(pg.connect()) as conn:
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with conn.cursor() as cur:
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cur.execute('CHECKPOINT;')
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cur.execute('select pg_current_wal_insert_lsn()')
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lsn_after_truncation = cur.fetchone()[0]
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# create new branch after clog truncation and start a compute node on it
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log.info(f'create branch at lsn_after_truncation {lsn_after_truncation}')
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env.zenith_cli.create_branch("test_clog_truncate_new",
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"test_clog_truncate@" + lsn_after_truncation)
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pg2 = env.postgres.create_start('test_clog_truncate_new')
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log.info('postgres is running on test_clog_truncate_new branch')
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# check that new node doesn't contain truncated segment
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pg_xact_0000_path_new = os.path.join(pg2.pg_xact_dir_path(), '0000')
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log.info(f"pg_xact_0000_path_new = {pg_xact_0000_path_new}")
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assert os.path.isfile(pg_xact_0000_path_new) is False
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