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Merge pull request #2684 from matrix-org/rav/unlock_upsert
Start work on avoiding table locks for upserts
This commit is contained in:
Richard van der Hoff
GitHub
commit
ba05f28ae7
2 changed files with 75 additions and 50 deletions
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@ -469,23 +469,46 @@ class SQLBaseStore(object):
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txn.executemany(sql, vals)
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@defer.inlineCallbacks
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def _simple_upsert(self, table, keyvalues, values,
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insertion_values={}, desc="_simple_upsert", lock=True):
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"""
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`lock` should generally be set to True (the default), but can be set
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to False if either of the following are true:
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* there is a UNIQUE INDEX on the key columns. In this case a conflict
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will cause an IntegrityError in which case this function will retry
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the update.
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* we somehow know that we are the only thread which will be updating
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this table.
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Args:
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table (str): The table to upsert into
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keyvalues (dict): The unique key tables and their new values
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values (dict): The nonunique columns and their new values
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insertion_values (dict): key/values to use when inserting
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insertion_values (dict): additional key/values to use only when
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inserting
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lock (bool): True to lock the table when doing the upsert.
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Returns:
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Deferred(bool): True if a new entry was created, False if an
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existing one was updated.
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"""
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return self.runInteraction(
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desc,
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self._simple_upsert_txn, table, keyvalues, values, insertion_values,
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lock
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)
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while True:
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try:
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result = yield self.runInteraction(
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desc,
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self._simple_upsert_txn, table, keyvalues, values, insertion_values,
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lock=lock
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)
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defer.returnValue(result)
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except self.database_engine.module.IntegrityError as e:
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# presumably we raced with another transaction: let's retry.
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logger.warn(
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"IntegrityError when upserting into %s; retrying: %s",
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table, e
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)
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def _simple_upsert_txn(self, txn, table, keyvalues, values, insertion_values={},
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lock=True):
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@ -493,7 +516,7 @@ class SQLBaseStore(object):
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if lock:
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self.database_engine.lock_table(txn, table)
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# Try to update
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# First try to update.
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sql = "UPDATE %s SET %s WHERE %s" % (
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table,
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", ".join("%s = ?" % (k,) for k in values),
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@ -502,24 +525,25 @@ class SQLBaseStore(object):
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sqlargs = values.values() + keyvalues.values()
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txn.execute(sql, sqlargs)
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if txn.rowcount == 0:
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# We didn't update and rows so insert a new one
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allvalues = {}
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allvalues.update(keyvalues)
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allvalues.update(values)
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allvalues.update(insertion_values)
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sql = "INSERT INTO %s (%s) VALUES (%s)" % (
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table,
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", ".join(k for k in allvalues),
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", ".join("?" for _ in allvalues)
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)
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txn.execute(sql, allvalues.values())
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return True
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else:
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if txn.rowcount > 0:
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# successfully updated at least one row.
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return False
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# We didn't update any rows so insert a new one
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allvalues = {}
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allvalues.update(keyvalues)
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allvalues.update(values)
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allvalues.update(insertion_values)
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sql = "INSERT INTO %s (%s) VALUES (%s)" % (
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table,
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", ".join(k for k in allvalues),
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", ".join("?" for _ in allvalues)
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)
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txn.execute(sql, allvalues.values())
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# successfully inserted
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return True
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def _simple_select_one(self, table, keyvalues, retcols,
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allow_none=False, desc="_simple_select_one"):
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"""Executes a SELECT query on the named table, which is expected to
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@ -204,34 +204,35 @@ class PusherStore(SQLBaseStore):
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pushkey, pushkey_ts, lang, data, last_stream_ordering,
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profile_tag=""):
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with self._pushers_id_gen.get_next() as stream_id:
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def f(txn):
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newly_inserted = self._simple_upsert_txn(
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txn,
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"pushers",
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{
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"app_id": app_id,
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"pushkey": pushkey,
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"user_name": user_id,
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},
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{
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"access_token": access_token,
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"kind": kind,
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"app_display_name": app_display_name,
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"device_display_name": device_display_name,
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"ts": pushkey_ts,
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"lang": lang,
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"data": encode_canonical_json(data),
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"last_stream_ordering": last_stream_ordering,
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"profile_tag": profile_tag,
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"id": stream_id,
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},
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)
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if newly_inserted:
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# get_if_user_has_pusher only cares if the user has
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# at least *one* pusher.
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txn.call_after(self.get_if_user_has_pusher.invalidate, (user_id,))
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# no need to lock because `pushers` has a unique key on
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# (app_id, pushkey, user_name) so _simple_upsert will retry
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newly_inserted = yield self._simple_upsert(
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table="pushers",
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keyvalues={
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"app_id": app_id,
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"pushkey": pushkey,
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"user_name": user_id,
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},
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values={
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"access_token": access_token,
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"kind": kind,
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"app_display_name": app_display_name,
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"device_display_name": device_display_name,
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"ts": pushkey_ts,
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"lang": lang,
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"data": encode_canonical_json(data),
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"last_stream_ordering": last_stream_ordering,
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"profile_tag": profile_tag,
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"id": stream_id,
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},
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desc="add_pusher",
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lock=False,
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)
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yield self.runInteraction("add_pusher", f)
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if newly_inserted:
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# get_if_user_has_pusher only cares if the user has
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# at least *one* pusher.
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self.get_if_user_has_pusher.invalidate(user_id,)
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@defer.inlineCallbacks
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def delete_pusher_by_app_id_pushkey_user_id(self, app_id, pushkey, user_id):
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