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Speed up chain cover calculation (#9176)

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Erik Johnston 2021-01-21 17:00:12 +00:00 • committed by GitHub
parent 12ec55bfaa
commit 758ed5f1bc
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3 changed files with 161 additions and 55 deletions
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16
synapse/storage/util/sequence.py
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@ -69,6 +69,11 @@ class SequenceGenerator(metaclass=abc.ABCMeta):
"""Gets the next ID in the sequence"""
...
@abc.abstractmethod
def get_next_mult_txn(self, txn: Cursor, n: int) -> List[int]:
"""Get the next `n` IDs in the sequence"""
...
@abc.abstractmethod
def check_consistency(
self,
@ -219,6 +224,17 @@ class LocalSequenceGenerator(SequenceGenerator):
self._current_max_id += 1
return self._current_max_id
def get_next_mult_txn(self, txn: Cursor, n: int) -> List[int]:
with self._lock:
if self._current_max_id is None:
assert self._callback is not None
self._current_max_id = self._callback(txn)
self._callback = None
first_id = self._current_max_id + 1
self._current_max_id += n
return [first_id + i for i in range(n)]
def check_consistency(
self,
db_conn: Connection,