diff options
| -rw-r--r-- | synapse/storage/background_updates.py | 19 | ||||
| -rw-r--r-- | synapse/storage/registration.py | 7 | ||||
| -rw-r--r-- | synapse/storage/schema/delta/38/postgres_fts_gist.sql | 6 | ||||
| -rw-r--r-- | synapse/storage/schema/delta/47/postgres_fts_gin.sql | 17 | ||||
| -rw-r--r-- | synapse/storage/search.py | 81 |
5 files changed, 110 insertions, 20 deletions
diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py index 11a1b942f1..c88759bf2c 100644 --- a/synapse/storage/background_updates.py +++ b/synapse/storage/background_updates.py @@ -242,6 +242,25 @@ class BackgroundUpdateStore(SQLBaseStore): """ self._background_update_handlers[update_name] = update_handler + def register_noop_background_update(self, update_name): + """Register a noop handler for a background update. + + This is useful when we previously did a background update, but no + longer wish to do the update. In this case the background update should + be removed from the schema delta files, but there may still be some + users who have the background update queued, so this method should + also be called to clear the update. + + Args: + update_name (str): Name of update + """ + @defer.inlineCallbacks + def noop_update(progress, batch_size): + yield self._end_background_update(update_name) + defer.returnValue(1) + + self.register_background_update_handler(update_name, noop_update) + def register_background_index_update(self, update_name, index_name, table, columns, where_clause=None, unique=False, diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py index 3aa810981f..95f75d6df1 100644 --- a/synapse/storage/registration.py +++ b/synapse/storage/registration.py @@ -39,12 +39,7 @@ class RegistrationStore(background_updates.BackgroundUpdateStore): # we no longer use refresh tokens, but it's possible that some people # might have a background update queued to build this index. Just # clear the background update. - @defer.inlineCallbacks - def noop_update(progress, batch_size): - yield self._end_background_update("refresh_tokens_device_index") - defer.returnValue(1) - self.register_background_update_handler( - "refresh_tokens_device_index", noop_update) + self.register_noop_background_update("refresh_tokens_device_index") @defer.inlineCallbacks def add_access_token_to_user(self, user_id, token, device_id=None): diff --git a/synapse/storage/schema/delta/38/postgres_fts_gist.sql b/synapse/storage/schema/delta/38/postgres_fts_gist.sql index f090a7b75a..515e6b8e84 100644 --- a/synapse/storage/schema/delta/38/postgres_fts_gist.sql +++ b/synapse/storage/schema/delta/38/postgres_fts_gist.sql @@ -13,5 +13,7 @@ * limitations under the License. */ - INSERT into background_updates (update_name, progress_json) - VALUES ('event_search_postgres_gist', '{}'); +-- We no longer do this given we back it out again in schema 47 + +-- INSERT into background_updates (update_name, progress_json) +-- VALUES ('event_search_postgres_gist', '{}'); diff --git a/synapse/storage/schema/delta/47/postgres_fts_gin.sql b/synapse/storage/schema/delta/47/postgres_fts_gin.sql new file mode 100644 index 0000000000..31d7a817eb --- /dev/null +++ b/synapse/storage/schema/delta/47/postgres_fts_gin.sql @@ -0,0 +1,17 @@ +/* Copyright 2018 New Vector Ltd + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +INSERT into background_updates (update_name, progress_json) + VALUES ('event_search_postgres_gin', '{}'); diff --git a/synapse/storage/search.py b/synapse/storage/search.py index f1ac9ba0fd..2755acff40 100644 --- a/synapse/storage/search.py +++ b/synapse/storage/search.py @@ -38,6 +38,7 @@ class SearchStore(BackgroundUpdateStore): EVENT_SEARCH_UPDATE_NAME = "event_search" EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order" EVENT_SEARCH_USE_GIST_POSTGRES_NAME = "event_search_postgres_gist" + EVENT_SEARCH_USE_GIN_POSTGRES_NAME = "event_search_postgres_gin" def __init__(self, db_conn, hs): super(SearchStore, self).__init__(db_conn, hs) @@ -48,9 +49,19 @@ class SearchStore(BackgroundUpdateStore): self.EVENT_SEARCH_ORDER_UPDATE_NAME, self._background_reindex_search_order ) - self.register_background_update_handler( + + # we used to have a background update to turn the GIN index into a + # GIST one; we no longer do that (obviously) because we actually want + # a GIN index. However, it's possible that some people might still have + # the background update queued, so we register a handler to clear the + # background update. + self.register_noop_background_update( self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME, - self._background_reindex_gist_search + ) + + self.register_background_update_handler( + self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME, + self._background_reindex_gin_search ) @defer.inlineCallbacks @@ -151,25 +162,48 @@ class SearchStore(BackgroundUpdateStore): defer.returnValue(result) @defer.inlineCallbacks - def _background_reindex_gist_search(self, progress, batch_size): + def _background_reindex_gin_search(self, progress, batch_size): + """This handles old synapses which used GIST indexes, if any; + converting them back to be GIN as per the actual schema. + """ + def create_index(conn): conn.rollback() - conn.set_session(autocommit=True) - c = conn.cursor() - c.execute( - "CREATE INDEX CONCURRENTLY event_search_fts_idx_gist" - " ON event_search USING GIST (vector)" - ) + # we have to set autocommit, because postgres refuses to + # CREATE INDEX CONCURRENTLY without it. + conn.set_session(autocommit=True) - c.execute("DROP INDEX event_search_fts_idx") + try: + c = conn.cursor() - conn.set_session(autocommit=False) + # if we skipped the conversion to GIST, we may already/still + # have an event_search_fts_idx; unfortunately postgres 9.4 + # doesn't support CREATE INDEX IF EXISTS so we just catch the + # exception and ignore it. + import psycopg2 + try: + c.execute( + "CREATE INDEX CONCURRENTLY event_search_fts_idx" + " ON event_search USING GIN (vector)" + ) + except psycopg2.ProgrammingError as e: + logger.warn( + "Ignoring error %r when trying to switch from GIST to GIN", + e + ) + + # we should now be able to delete the GIST index. + c.execute( + "DROP INDEX IF EXISTS event_search_fts_idx_gist" + ) + finally: + conn.set_session(autocommit=False) if isinstance(self.database_engine, PostgresEngine): yield self.runWithConnection(create_index) - yield self._end_background_update(self.EVENT_SEARCH_USE_GIST_POSTGRES_NAME) + yield self._end_background_update(self.EVENT_SEARCH_USE_GIN_POSTGRES_NAME) defer.returnValue(1) @defer.inlineCallbacks @@ -289,7 +323,30 @@ class SearchStore(BackgroundUpdateStore): entry.stream_ordering, entry.origin_server_ts, ) for entry in entries) + # inserts to a GIN index are normally batched up into a pending + # list, and then all committed together once the list gets to a + # certain size. The trouble with that is that postgres (pre-9.5) + # uses work_mem to determine the length of the list, and work_mem + # is typically very large. + # + # We therefore reduce work_mem while we do the insert. + # + # (postgres 9.5 uses the separate gin_pending_list_limit setting, + # so doesn't suffer the same problem, but changing work_mem will + # be harmless) + # + # Note that we don't need to worry about restoring it on + # exception, because exceptions will cause the transaction to be + # rolled back, including the effects of the SET command. + # + # Also: we use SET rather than SET LOCAL because there's lots of + # other stuff going on in this transaction, which want to have the + # normal work_mem setting. + + txn.execute("SET work_mem='256kB'") txn.executemany(sql, args) + txn.execute("RESET work_mem") + elif isinstance(self.database_engine, Sqlite3Engine): sql = ( "INSERT INTO event_search (event_id, room_id, key, value)" |