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Add more logging to debug slow startup (#8264)
I'm hoping this will provide some pointers for debugging https://github.com/matrix-org/synapse/issues/7968.
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parent
96312536f2
commit
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5 changed files with 33 additions and 7 deletions
1
changelog.d/8264.misc
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1
changelog.d/8264.misc
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@ -0,0 +1 @@
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Add more logging to debug slow startup.
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@ -47,9 +47,14 @@ class Databases:
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engine = create_engine(database_config.config)
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with make_conn(database_config, engine) as db_conn:
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logger.info("Preparing database %r...", db_name)
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logger.info("[database config %r]: Checking database server", db_name)
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engine.check_database(db_conn)
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logger.info(
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"[database config %r]: Preparing for databases %r",
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db_name,
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database_config.databases,
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)
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prepare_database(
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db_conn, engine, hs.config, databases=database_config.databases,
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)
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@ -57,7 +62,9 @@ class Databases:
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database = DatabasePool(hs, database_config, engine)
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if "main" in database_config.databases:
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logger.info("Starting 'main' data store")
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logger.info(
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"[database config %r]: Starting 'main' database", db_name
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)
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# Sanity check we don't try and configure the main store on
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# multiple databases.
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@ -72,7 +79,9 @@ class Databases:
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persist_events = PersistEventsStore(hs, database, main)
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if "state" in database_config.databases:
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logger.info("Starting 'state' data store")
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logger.info(
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"[database config %r]: Starting 'state' database", db_name
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)
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# Sanity check we don't try and configure the state store on
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# multiple databases.
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@ -85,7 +94,7 @@ class Databases:
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self.databases.append(database)
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logger.info("Database %r prepared", db_name)
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logger.info("[database config %r]: prepared", db_name)
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# Closing the context manager doesn't close the connection.
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# psycopg will close the connection when the object gets GCed, but *only*
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@ -98,10 +107,10 @@ class Databases:
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# Sanity check that we have actually configured all the required stores.
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if not main:
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raise Exception("No 'main' data store configured")
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raise Exception("No 'main' database configured")
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if not state:
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raise Exception("No 'state' data store configured")
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raise Exception("No 'state' database configured")
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# We use local variables here to ensure that the databases do not have
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# optional types.
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@ -591,6 +591,7 @@ def check_database_before_upgrade(cur, database_engine, config: HomeServerConfig
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"""Called before upgrading an existing database to check that it is broadly sane
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compared with the configuration.
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"""
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logger.info("Running sanity-checks on database...")
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domain = config.server_name
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sql = database_engine.convert_param_style(
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@ -82,10 +82,18 @@ def prepare_database(db_conn, database_engine, config, databases=["main", "state
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try:
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cur = db_conn.cursor()
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logger.info("%r: Checking existing schema version", databases)
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version_info = _get_or_create_schema_state(cur, database_engine)
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if version_info:
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user_version, delta_files, upgraded = version_info
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logger.info(
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"%r: Existing schema is %i (+%i deltas)",
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databases,
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user_version,
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len(delta_files),
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)
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# config should only be None when we are preparing an in-memory SQLite db,
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# which should be empty.
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@ -111,6 +119,8 @@ def prepare_database(db_conn, database_engine, config, databases=["main", "state
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databases=databases,
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)
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else:
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logger.info("%r: Initialising new database", databases)
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# if it's a worker app, refuse to upgrade the database, to avoid multiple
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# workers doing it at once.
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if config and config.worker_app is not None:
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@ -15,6 +15,7 @@
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import contextlib
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import heapq
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import logging
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import threading
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from collections import deque
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from typing import Dict, List, Set
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@ -24,6 +25,8 @@ from typing_extensions import Deque
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from synapse.storage.database import DatabasePool, LoggingTransaction
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from synapse.storage.util.sequence import PostgresSequenceGenerator
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logger = logging.getLogger(__name__)
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class IdGenerator:
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def __init__(self, db_conn, table, column):
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@ -48,6 +51,8 @@ def _load_current_id(db_conn, table, column, step=1):
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Returns:
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int
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"""
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# debug logging for https://github.com/matrix-org/synapse/issues/7968
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logger.info("initialising stream generator for %s(%s)", table, column)
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cur = db_conn.cursor()
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if step == 1:
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cur.execute("SELECT MAX(%s) FROM %s" % (column, table))
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