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Rename table. Add docs.

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This commit is contained in:
Erik Johnston 2016-08-15 11:45:57 +01:00
parent 784a2d4f2c
commit d9664344ec
4 changed files with 16 additions and 6 deletions
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2
synapse/replication/slave/storage/_base.py
View file

@ -29,7 +29,7 @@ class BaseSlavedStore(SQLBaseStore):
super(BaseSlavedStore, self).__init__(hs)
if isinstance(self.database_engine, PostgresEngine):
self._cache_id_gen = SlavedIdTracker(
db_conn, "cache_stream", "stream_id",
db_conn, "cache_invalidation_stream", "stream_id",
)
else:
self._cache_id_gen = None

2
synapse/storage/__init__.py
View file

@ -126,7 +126,7 @@ class DataStore(RoomMemberStore, RoomStore,
if isinstance(self.database_engine, PostgresEngine):
self._cache_id_gen = StreamIdGenerator(
db_conn, "cache_stream", "stream_id",
db_conn, "cache_invalidation_stream", "stream_id",
)
else:
self._cache_id_gen = None

12
synapse/storage/_base.py
View file

@ -863,6 +863,13 @@ class SQLBaseStore(object):
return cache, min_val
def _invalidate_cache_and_stream(self, txn, cache_func, keys):
"""Invalidates the cache and adds it to the cache stream so slaves
will know to invalidate their caches.
This should only be used to invalidate caches where slaves won't
otherwise know from other replication streams that the cache should
be invalidated.
"""
txn.call_after(cache_func.invalidate, keys)
if isinstance(self.database_engine, PostgresEngine):
@ -872,7 +879,7 @@ class SQLBaseStore(object):
self._simple_insert_txn(
txn,
table="cache_stream",
table="cache_invalidation_stream",
values={
"stream_id": stream_id,
"cache_func": cache_func.__name__,
@ -887,7 +894,8 @@ class SQLBaseStore(object):
# send across cache invalidations as quickly as possible. Cache
# invalidations are idempotent, so duplicates are fine.
sql = (
"SELECT stream_id, cache_func, keys, invalidation_ts FROM cache_stream"
"SELECT stream_id, cache_func, keys, invalidation_ts"
" FROM cache_invalidation_stream"
" WHERE stream_id > ? ORDER BY stream_id ASC LIMIT ?"
)
txn.execute(sql, (last_id, limit,))

6
synapse/storage/schema/delta/34/cache_stream.py
View file

@ -20,15 +20,17 @@ import logging
logger = logging.getLogger(__name__)
# This stream is used to notify replication slaves that some caches have
# been invalidated that they cannot infer from the other streams.
CREATE_TABLE = """
CREATE TABLE cache_stream (
CREATE TABLE cache_invalidation_stream (
stream_id BIGINT,
cache_func TEXT,
keys TEXT[],
invalidation_ts BIGINT
);
CREATE INDEX cache_stream_id ON cache_stream(stream_id);
CREATE INDEX cache_invalidation_stream_id ON cache_invalidation_stream(stream_id);
"""