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Use native UPSERTs where possible (#4306)

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Amber Brown 2019-01-24 21:31:54 +11:00 • committed by GitHub
parent 97fd29c019
commit 58f6c48183
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14 changed files with 238 additions and 43 deletions
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148
synapse/storage/_base.py
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@ -192,6 +192,41 @@ class SQLBaseStore(object):
self.database_engine = hs.database_engine
# A set of tables that are not safe to use native upserts in.
self._unsafe_to_upsert_tables = {"user_ips"}
if self.database_engine.can_native_upsert:
# Check ASAP (and then later, every 1s) to see if we have finished
# background updates of tables that aren't safe to update.
self._clock.call_later(0.0, self._check_safe_to_upsert)
@defer.inlineCallbacks
def _check_safe_to_upsert(self):
"""
Is it safe to use native UPSERT?
If there are background updates, we will need to wait, as they may be
the addition of indexes that set the UNIQUE constraint that we require.
If the background updates have not completed, wait a second and check again.
"""
updates = yield self._simple_select_list(
"background_updates",
keyvalues=None,
retcols=["update_name"],
desc="check_background_updates",
)
updates = [x["update_name"] for x in updates]
# The User IPs table in schema #53 was missing a unique index, which we
# run as a background update.
if "user_ips_device_unique_index" not in updates:
self._unsafe_to_upsert_tables.discard("user_id")
# If there's any tables left to check, reschedule to run.
if self._unsafe_to_upsert_tables:
self._clock.call_later(1.0, self._check_safe_to_upsert)
def start_profiling(self):
self._previous_loop_ts = self._clock.time_msec()
@ -494,8 +529,15 @@ class SQLBaseStore(object):
txn.executemany(sql, vals)
@defer.inlineCallbacks
def _simple_upsert(self, table, keyvalues, values,
insertion_values={}, desc="_simple_upsert", lock=True):
def _simple_upsert(
self,
table,
keyvalues,
values,
insertion_values={},
desc="_simple_upsert",
lock=True
):
"""
`lock` should generally be set to True (the default), but can be set
@ -516,16 +558,21 @@ class SQLBaseStore(object):
inserting
lock (bool): True to lock the table when doing the upsert.
Returns:
Deferred(bool): True if a new entry was created, False if an
existing one was updated.
Deferred(None or bool): Native upserts always return None. Emulated
upserts return True if a new entry was created, False if an existing
one was updated.
"""
attempts = 0
while True:
try:
result = yield self.runInteraction(
desc,
self._simple_upsert_txn, table, keyvalues, values, insertion_values,
lock=lock
self._simple_upsert_txn,
table,
keyvalues,
values,
insertion_values,
lock=lock,
)
defer.returnValue(result)
except self.database_engine.module.IntegrityError as e:
@ -537,12 +584,59 @@ class SQLBaseStore(object):
# presumably we raced with another transaction: let's retry.
logger.warn(
"IntegrityError when upserting into %s; retrying: %s",
table, e
"%s when upserting into %s; retrying: %s", e.__name__, table, e
)
def _simple_upsert_txn(self, txn, table, keyvalues, values, insertion_values={},
lock=True):
def _simple_upsert_txn(
self,
txn,
table,
keyvalues,
values,
insertion_values={},
lock=True,
):
"""
Pick the UPSERT method which works best on the platform. Either the
native one (Pg9.5+, recent SQLites), or fall back to an emulated method.
Args:
txn: The transaction to use.
table (str): The table to upsert into
keyvalues (dict): The unique key tables and their new values
values (dict): The nonunique columns and their new values
insertion_values (dict): additional key/values to use only when
inserting
lock (bool): True to lock the table when doing the upsert.
Returns:
Deferred(None or bool): Native upserts always return None. Emulated
upserts return True if a new entry was created, False if an existing
one was updated.
"""
if (
self.database_engine.can_native_upsert
and table not in self._unsafe_to_upsert_tables
):
return self._simple_upsert_txn_native_upsert(
txn,
table,
keyvalues,
values,
insertion_values=insertion_values,
)
else:
return self._simple_upsert_txn_emulated(
txn,
table,
keyvalues,
values,
insertion_values=insertion_values,
lock=lock,
)
def _simple_upsert_txn_emulated(
self, txn, table, keyvalues, values, insertion_values={}, lock=True
):
# We need to lock the table :(, unless we're *really* careful
if lock:
self.database_engine.lock_table(txn, table)
@ -577,12 +671,44 @@ class SQLBaseStore(object):
sql = "INSERT INTO %s (%s) VALUES (%s)" % (
table,
", ".join(k for k in allvalues),
", ".join("?" for _ in allvalues)
", ".join("?" for _ in allvalues),
)
txn.execute(sql, list(allvalues.values()))
# successfully inserted
return True
def _simple_upsert_txn_native_upsert(
self, txn, table, keyvalues, values, insertion_values={}
):
"""
Use the native UPSERT functionality in recent PostgreSQL versions.
Args:
table (str): The table to upsert into
keyvalues (dict): The unique key tables and their new values
values (dict): The nonunique columns and their new values
insertion_values (dict): additional key/values to use only when
inserting
Returns:
None
"""
allvalues = {}
allvalues.update(keyvalues)
allvalues.update(values)
allvalues.update(insertion_values)
sql = (
"INSERT INTO %s (%s) VALUES (%s) "
"ON CONFLICT (%s) DO UPDATE SET %s"
) % (
table,
", ".join(k for k in allvalues),
", ".join("?" for _ in allvalues),
", ".join(k for k in keyvalues),
", ".join(k + "=EXCLUDED." + k for k in values),
)
txn.execute(sql, list(allvalues.values()))
def _simple_select_one(self, table, keyvalues, retcols,
allow_none=False, desc="_simple_select_one"):
"""Executes a SELECT query on the named table, which is expected to