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092a9b74d3
Newer version of mypy fixes buggy error when trying to update only boto3 stubs. However it brings new checks and starts to yell when we index into cusror.fetchone without checking for None first. So this introduces a wrapper to simplify quering for scalar values. I tried to use cursor_factory connection argument but without success. There can be a better way to do that, but this looks the simplest
127 lines
5.1 KiB
Python
127 lines
5.1 KiB
Python
import psycopg2.extras
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import pytest
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from fixtures.log_helper import log
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from fixtures.utils import print_gc_result, query_scalar
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from fixtures.neon_fixtures import NeonEnvBuilder
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#
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# Create a couple of branches off the main branch, at a historical point in time.
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#
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def test_branch_behind(neon_env_builder: NeonEnvBuilder):
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# Use safekeeper in this test to avoid a subtle race condition.
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# Without safekeeper, walreceiver reconnection can stuck
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# because of IO deadlock.
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#
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# See https://github.com/neondatabase/neon/issues/1068
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neon_env_builder.num_safekeepers = 1
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# Disable pitr, because here we want to test branch creation after GC
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neon_env_builder.pageserver_config_override = "tenant_config={pitr_interval = '0 sec'}"
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env = neon_env_builder.init_start()
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# Branch at the point where only 100 rows were inserted
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env.neon_cli.create_branch('test_branch_behind')
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pgmain = env.postgres.create_start('test_branch_behind')
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log.info("postgres is running on 'test_branch_behind' branch")
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main_cur = pgmain.connect().cursor()
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timeline = query_scalar(main_cur, "SHOW neon.timeline_id")
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# Create table, and insert the first 100 rows
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main_cur.execute('CREATE TABLE foo (t text)')
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# keep some early lsn to test branch creation on out of date lsn
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gced_lsn = query_scalar(main_cur, 'SELECT pg_current_wal_insert_lsn()')
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main_cur.execute('''
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INSERT INTO foo
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SELECT 'long string to consume some space' || g
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FROM generate_series(1, 100) g
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''')
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lsn_a = query_scalar(main_cur, 'SELECT pg_current_wal_insert_lsn()')
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log.info(f'LSN after 100 rows: {lsn_a}')
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# Insert some more rows. (This generates enough WAL to fill a few segments.)
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main_cur.execute('''
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INSERT INTO foo
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SELECT 'long string to consume some space' || g
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FROM generate_series(1, 200000) g
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''')
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lsn_b = query_scalar(main_cur, 'SELECT pg_current_wal_insert_lsn()')
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log.info(f'LSN after 200100 rows: {lsn_b}')
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# Branch at the point where only 100 rows were inserted
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env.neon_cli.create_branch('test_branch_behind_hundred',
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'test_branch_behind',
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ancestor_start_lsn=lsn_a)
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# Insert many more rows. This generates enough WAL to fill a few segments.
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main_cur.execute('''
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INSERT INTO foo
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SELECT 'long string to consume some space' || g
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FROM generate_series(1, 200000) g
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''')
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lsn_c = query_scalar(main_cur, 'SELECT pg_current_wal_insert_lsn()')
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log.info(f'LSN after 400100 rows: {lsn_c}')
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# Branch at the point where only 200100 rows were inserted
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env.neon_cli.create_branch('test_branch_behind_more',
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'test_branch_behind',
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ancestor_start_lsn=lsn_b)
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pg_hundred = env.postgres.create_start('test_branch_behind_hundred')
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pg_more = env.postgres.create_start('test_branch_behind_more')
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# On the 'hundred' branch, we should see only 100 rows
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hundred_cur = pg_hundred.connect().cursor()
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assert query_scalar(hundred_cur, 'SELECT count(*) FROM foo') == 100
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# On the 'more' branch, we should see 100200 rows
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more_cur = pg_more.connect().cursor()
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assert query_scalar(more_cur, 'SELECT count(*) FROM foo') == 200100
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# All the rows are visible on the main branch
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assert query_scalar(main_cur, 'SELECT count(*) FROM foo') == 400100
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# Check bad lsn's for branching
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# branch at segment boundary
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env.neon_cli.create_branch('test_branch_segment_boundary',
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'test_branch_behind',
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ancestor_start_lsn="0/3000000")
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pg = env.postgres.create_start('test_branch_segment_boundary')
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assert pg.safe_psql('SELECT 1')[0][0] == 1
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# branch at pre-initdb lsn
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with pytest.raises(Exception, match="invalid branch start lsn"):
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env.neon_cli.create_branch('test_branch_preinitdb', ancestor_start_lsn="0/42")
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# branch at pre-ancestor lsn
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with pytest.raises(Exception, match="less than timeline ancestor lsn"):
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env.neon_cli.create_branch('test_branch_preinitdb',
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'test_branch_behind',
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ancestor_start_lsn="0/42")
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# check that we cannot create branch based on garbage collected data
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with env.pageserver.cursor(cursor_factory=psycopg2.extras.DictCursor) as pscur:
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# call gc to advace latest_gc_cutoff_lsn
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pscur.execute(f"do_gc {env.initial_tenant.hex} {timeline} 0")
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row = pscur.fetchone()
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print_gc_result(row)
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with pytest.raises(Exception, match="invalid branch start lsn"):
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# this gced_lsn is pretty random, so if gc is disabled this woudln't fail
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env.neon_cli.create_branch('test_branch_create_fail',
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'test_branch_behind',
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ancestor_start_lsn=gced_lsn)
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# check that after gc everything is still there
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assert query_scalar(hundred_cur, 'SELECT count(*) FROM foo') == 100
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assert query_scalar(more_cur, 'SELECT count(*) FROM foo') == 200100
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assert query_scalar(main_cur, 'SELECT count(*) FROM foo') == 400100
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