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da626fb1fa
It seems like useless chatter. The endpoint.start() itself prints a "Running command ... neon_local endpoint start" message too.
241 lines
9.7 KiB
Python
241 lines
9.7 KiB
Python
import time
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from fixtures.log_helper import log
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from fixtures.neon_fixtures import NeonEnv, NeonEnvBuilder, fork_at_current_lsn
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#
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# Test that the VM bit is cleared correctly at a HEAP_DELETE and
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# HEAP_UPDATE record.
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#
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def test_vm_bit_clear(neon_simple_env: NeonEnv):
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env = neon_simple_env
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env.neon_cli.create_branch("test_vm_bit_clear", "empty")
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endpoint = env.endpoints.create_start("test_vm_bit_clear")
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pg_conn = endpoint.connect()
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cur = pg_conn.cursor()
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# Install extension containing function needed for test
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cur.execute("CREATE EXTENSION neon_test_utils")
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# Create a test table for a few different scenarios and freeze it to set the VM bits.
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cur.execute("CREATE TABLE vmtest_delete (id integer PRIMARY KEY)")
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cur.execute("INSERT INTO vmtest_delete VALUES (1)")
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cur.execute("VACUUM FREEZE vmtest_delete")
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cur.execute("CREATE TABLE vmtest_hot_update (id integer PRIMARY KEY, filler text)")
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cur.execute("INSERT INTO vmtest_hot_update VALUES (1, 'x')")
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cur.execute("VACUUM FREEZE vmtest_hot_update")
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cur.execute("CREATE TABLE vmtest_cold_update (id integer PRIMARY KEY)")
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cur.execute("INSERT INTO vmtest_cold_update SELECT g FROM generate_series(1, 1000) g")
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cur.execute("VACUUM FREEZE vmtest_cold_update")
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cur.execute(
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"CREATE TABLE vmtest_cold_update2 (id integer PRIMARY KEY, filler text) WITH (fillfactor=100)"
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)
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cur.execute("INSERT INTO vmtest_cold_update2 SELECT g, '' FROM generate_series(1, 1000) g")
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cur.execute("VACUUM FREEZE vmtest_cold_update2")
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# DELETE and UPDATE the rows.
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cur.execute("DELETE FROM vmtest_delete WHERE id = 1")
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cur.execute("UPDATE vmtest_hot_update SET filler='x' WHERE id = 1")
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cur.execute("UPDATE vmtest_cold_update SET id = 5000 WHERE id = 1")
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# Clear the VM bit on the last page with an INSERT. Then clear the VM bit on
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# the page where row 1 is (block 0), by doing an UPDATE. The UPDATE is a
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# cold update, and the new tuple goes to the last page, which already had
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# its VM bit cleared. The point is that the UPDATE *only* clears the VM bit
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# on the page containing the old tuple. We had a bug where we got the old
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# and new pages mixed up, and that only shows up when one of the bits is
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# cleared, but not the other one.
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cur.execute("INSERT INTO vmtest_cold_update2 VALUES (9999, 'x')")
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# Clears the VM bit on the old page
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cur.execute("UPDATE vmtest_cold_update2 SET id = 5000, filler=repeat('x', 200) WHERE id = 1")
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# Branch at this point, to test that later
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fork_at_current_lsn(env, endpoint, "test_vm_bit_clear_new", "test_vm_bit_clear")
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# Clear the buffer cache, to force the VM page to be re-fetched from
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# the page server
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cur.execute("SELECT clear_buffer_cache()")
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# Check that an index-only scan doesn't see the deleted row. If the
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# clearing of the VM bit was not replayed correctly, this would incorrectly
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# return deleted row.
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cur.execute(
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"""
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set enable_seqscan=off;
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set enable_indexscan=on;
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set enable_bitmapscan=off;
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"""
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)
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cur.execute("SELECT id FROM vmtest_delete WHERE id = 1")
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assert cur.fetchall() == []
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cur.execute("SELECT id FROM vmtest_hot_update WHERE id = 1")
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assert cur.fetchall() == [(1,)]
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cur.execute("SELECT id FROM vmtest_cold_update WHERE id = 1")
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assert cur.fetchall() == []
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cur.execute("SELECT id FROM vmtest_cold_update2 WHERE id = 1")
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assert cur.fetchall() == []
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cur.close()
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# Check the same thing on the branch that we created right after the DELETE
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#
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# As of this writing, the code in smgrwrite() creates a full-page image whenever
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# a dirty VM page is evicted. If the VM bit was not correctly cleared by the
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# earlier WAL record, the full-page image hides the problem. Starting a new
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# server at the right point-in-time avoids that full-page image.
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endpoint_new = env.endpoints.create_start("test_vm_bit_clear_new")
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pg_new_conn = endpoint_new.connect()
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cur_new = pg_new_conn.cursor()
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cur_new.execute(
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"""
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set enable_seqscan=off;
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set enable_indexscan=on;
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set enable_bitmapscan=off;
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"""
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)
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cur_new.execute("SELECT id FROM vmtest_delete WHERE id = 1")
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assert cur_new.fetchall() == []
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cur_new.execute("SELECT id FROM vmtest_hot_update WHERE id = 1")
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assert cur_new.fetchall() == [(1,)]
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cur_new.execute("SELECT id FROM vmtest_cold_update WHERE id = 1")
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assert cur_new.fetchall() == []
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cur_new.execute("SELECT id FROM vmtest_cold_update2 WHERE id = 1")
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assert cur_new.fetchall() == []
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#
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# Test that the ALL_FROZEN VM bit is cleared correctly at a HEAP_LOCK
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# record.
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#
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def test_vm_bit_clear_on_heap_lock(neon_env_builder: NeonEnvBuilder):
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tenant_conf = {
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"checkpoint_distance": f"{128 * 1024}",
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"compaction_target_size": f"{128 * 1024}",
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"compaction_threshold": "1",
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# create image layers eagerly, so that GC can remove some layers
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"image_creation_threshold": "1",
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# set PITR interval to be small, so we can do GC
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"pitr_interval": "0 s",
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}
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env = neon_env_builder.init_start(initial_tenant_conf=tenant_conf)
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tenant_id = env.initial_tenant
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timeline_id = env.neon_cli.create_branch("test_vm_bit_clear_on_heap_lock")
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endpoint = env.endpoints.create_start(
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"test_vm_bit_clear_on_heap_lock",
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config_lines=[
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"log_autovacuum_min_duration = 0",
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# Perform anti-wraparound vacuuming aggressively
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"autovacuum_naptime='1 s'",
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"autovacuum_freeze_max_age = 1000000",
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],
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)
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pg_conn = endpoint.connect()
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cur = pg_conn.cursor()
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# Install extension containing function needed for test
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cur.execute("CREATE EXTENSION neon_test_utils")
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cur.execute("CREATE EXTENSION pageinspect")
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# Create a test table and freeze it to set the all-frozen VM bit on all pages.
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cur.execute("CREATE TABLE vmtest_lock (id integer PRIMARY KEY)")
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cur.execute("INSERT INTO vmtest_lock SELECT g FROM generate_series(1, 50000) g")
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cur.execute("VACUUM (FREEZE, DISABLE_PAGE_SKIPPING true) vmtest_lock")
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# Lock a row. This clears the all-frozen VM bit for that page.
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cur.execute("BEGIN")
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cur.execute("SELECT * FROM vmtest_lock WHERE id = 40000 FOR UPDATE")
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# Remember the XID. We will use it later to verify that we have consumed a lot of
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# XIDs after this.
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cur.execute("select pg_current_xact_id()")
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locking_xid = int(cur.fetchall()[0][0])
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cur.execute("COMMIT")
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# The VM page in shared buffer cache, and the same page as reconstructed
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# by the pageserver, should be equal.
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cur.execute("select get_raw_page( 'vmtest_lock', 'vm', 0 )")
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vm_page_in_cache = (cur.fetchall()[0][0])[:100].hex()
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cur.execute("select get_raw_page_at_lsn( 'vmtest_lock', 'vm', 0, pg_current_wal_insert_lsn() )")
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vm_page_at_pageserver = (cur.fetchall()[0][0])[:100].hex()
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assert vm_page_at_pageserver == vm_page_in_cache
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# The above assert is enough to verify the bug that was fixed in
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# commit 66fa176cc8. But for good measure, we also reproduce the
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# original problem that the missing VM page update caused. The
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# rest of the test does that.
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# Kill and restart postgres, to clear the buffer cache.
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#
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# NOTE: clear_buffer_cache() will not do, because it evicts the dirty pages
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# in a "clean" way. Our neon extension will write a full-page image of the VM
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# page, and we want to avoid that. A clean shutdown will also not do, for the
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# same reason.
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endpoint.stop(mode="immediate")
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endpoint.start()
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pg_conn = endpoint.connect()
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cur = pg_conn.cursor()
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# Consume a lot of XIDs, so that anti-wraparound autovacuum kicks
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# in and the clog gets truncated. We set autovacuum_freeze_max_age to a very
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# low value, so it doesn't take all that many XIDs for autovacuum to kick in.
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#
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# We could use test_consume_xids() to consume XIDs much faster,
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# but it wouldn't speed up the overall test, because we'd still
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# need to wait for autovacuum to run.
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for _ in range(1000):
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cur.execute("select test_consume_xids(10000);")
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for _ in range(1000):
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cur.execute(
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"select get_raw_page_at_lsn( 'vmtest_lock', 'vm', 0, pg_current_wal_insert_lsn() )"
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)
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page = (cur.fetchall()[0][0])[:100].hex()
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log.info(f"VM page contents: {page}")
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cur.execute("select get_raw_page( 'vmtest_lock', 'vm', 0 )")
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page = (cur.fetchall()[0][0])[:100].hex()
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log.info(f"VM page contents in cache: {page}")
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cur.execute("select min(datfrozenxid::text::int) from pg_database")
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datfrozenxid = int(cur.fetchall()[0][0])
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log.info(f"datfrozenxid {datfrozenxid} locking_xid: {locking_xid}")
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if datfrozenxid > locking_xid + 3000000:
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break
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time.sleep(0.5)
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cur.execute("select pg_current_xact_id()")
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curr_xid = int(cur.fetchall()[0][0])
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assert curr_xid - locking_xid >= 100000
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# Perform GC in the pageserver. Otherwise the compute might still
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# be able to download the already-deleted SLRU segment from the
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# pageserver. That masks the original bug.
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env.pageserver.http_client().timeline_checkpoint(tenant_id, timeline_id)
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env.pageserver.http_client().timeline_compact(tenant_id, timeline_id)
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env.pageserver.http_client().timeline_gc(tenant_id, timeline_id, 0)
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# Now, if the VM all-frozen bit was not correctly cleared on
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# replay, we will try to fetch the status of the XID that was
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# already truncated away.
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#
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# ERROR: could not access status of transaction 1027
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cur.execute("select xmin, xmax, * from vmtest_lock where id = 40000 for update")
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tup = cur.fetchall()
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log.info(f"tuple = {tup}")
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cur.execute("commit transaction")
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