mirror of
https://github.com/neondatabase/neon.git
synced 2026-01-08 14:02:55 +00:00
53f438a8a8
We use the term "endpoint" in for compute Postgres nodes in the web UI
and user-facing documentation now. Adjust the nomenclature in the code.
This changes the name of the "neon_local pg" command to "neon_local
endpoint". Also adjust names of classes, variables etc. in the python
tests accordingly.
This also changes the directory structure so that endpoints are now
stored in:
.neon/endpoints/<endpoint id>
instead of:
.neon/pgdatadirs/tenants/<tenant_id>/<endpoint (node) name>
The tenant ID is no longer part of the path. That means that you
cannot have two endpoints with the same name/ID in two different
tenants anymore. That's consistent with how we treat endpoints in the
real control plane and proxy: the endpoint ID must be globally unique.
74 lines
3.1 KiB
Python
74 lines
3.1 KiB
Python
from fixtures.log_helper import log
|
|
from fixtures.neon_fixtures import NeonEnvBuilder
|
|
from fixtures.types import TimelineId
|
|
from fixtures.utils import print_gc_result, query_scalar
|
|
|
|
|
|
#
|
|
# Test where Postgres generates a lot of WAL, and it's garbage collected away, but
|
|
# no pages are evicted so that Postgres uses an old LSN in a GetPage request.
|
|
# We had a bug where the page server failed to find the page version because it
|
|
# thought it was already garbage collected away, because the LSN in the GetPage
|
|
# request was very old and the WAL from that time was indeed already removed.
|
|
# In reality, the LSN on a GetPage request coming from a primary server is
|
|
# just a hint that the page hasn't been modified since that LSN, and the page
|
|
# server should return the latest page version regardless of the LSN.
|
|
#
|
|
def test_old_request_lsn(neon_env_builder: NeonEnvBuilder):
|
|
# Disable pitr, because here we want to test branch creation after GC
|
|
neon_env_builder.pageserver_config_override = "tenant_config={pitr_interval = '0 sec'}"
|
|
env = neon_env_builder.init_start()
|
|
env.neon_cli.create_branch("test_old_request_lsn", "main")
|
|
endpoint = env.endpoints.create_start("test_old_request_lsn")
|
|
log.info("postgres is running on test_old_request_lsn branch")
|
|
|
|
pg_conn = endpoint.connect()
|
|
cur = pg_conn.cursor()
|
|
|
|
# Get the timeline ID of our branch. We need it for the 'do_gc' command
|
|
timeline = TimelineId(query_scalar(cur, "SHOW neon.timeline_id"))
|
|
|
|
pageserver_http = env.pageserver.http_client()
|
|
|
|
# Create table, and insert some rows. Make it big enough that it doesn't fit in
|
|
# shared_buffers.
|
|
cur.execute("CREATE TABLE foo (id int4 PRIMARY KEY, val int, t text)")
|
|
cur.execute(
|
|
"""
|
|
INSERT INTO foo
|
|
SELECT g, 1, 'long string to consume some space' || g
|
|
FROM generate_series(1, 100000) g
|
|
"""
|
|
)
|
|
|
|
# Verify that the table is larger than shared_buffers, so that the SELECT below
|
|
# will cause GetPage requests.
|
|
cur.execute(
|
|
"""
|
|
select setting::int * pg_size_bytes(unit) as shared_buffers, pg_relation_size('foo') as tbl_size
|
|
from pg_settings where name = 'shared_buffers'
|
|
"""
|
|
)
|
|
row = cur.fetchone()
|
|
assert row is not None
|
|
log.info(f"shared_buffers is {row[0]}, table size {row[1]}")
|
|
assert int(row[0]) < int(row[1])
|
|
|
|
cur.execute("VACUUM foo")
|
|
|
|
# Make a lot of updates on a single row, generating a lot of WAL. Trigger
|
|
# garbage collections so that the page server will remove old page versions.
|
|
for i in range(10):
|
|
pageserver_http.timeline_checkpoint(env.initial_tenant, timeline)
|
|
gc_result = pageserver_http.timeline_gc(env.initial_tenant, timeline, 0)
|
|
print_gc_result(gc_result)
|
|
|
|
for j in range(100):
|
|
cur.execute("UPDATE foo SET val = val + 1 WHERE id = 1;")
|
|
|
|
# All (or at least most of) the updates should've been on the same page, so
|
|
# that we haven't had to evict any dirty pages for a long time. Now run
|
|
# a query that sends GetPage@LSN requests with the old LSN.
|
|
cur.execute("SELECT COUNT(*), SUM(val) FROM foo")
|
|
assert cur.fetchone() == (100000, 101000)
|