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Merge pull request #2867 from matrix-org/rav/rework_purge

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purge_history cleanups
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Richard van der Hoff 2018-02-15 09:49:07 +00:00 committed by GitHub
commit b8d821aa68
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1 changed files with 83 additions and 35 deletions
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118
synapse/storage/events.py
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@ -2093,6 +2093,30 @@ class EventsStore(SQLBaseStore):
# state_groups
# state_groups_state
# we will build a temporary table listing the events so that we don't
# have to keep shovelling the list back and forth across the
# connection. Annoyingly the python sqlite driver commits the
# transaction on CREATE, so let's do this first.
#
# furthermore, we might already have the table from a previous (failed)
# purge attempt, so let's drop the table first.
txn.execute("DROP TABLE IF EXISTS events_to_purge")
txn.execute(
"CREATE TEMPORARY TABLE events_to_purge ("
" event_id TEXT NOT NULL,"
" should_delete BOOLEAN NOT NULL"
")"
)
# create an index on should_delete because later we'll be looking for
# the should_delete / shouldn't_delete subsets
txn.execute(
"CREATE INDEX events_to_purge_should_delete"
" ON events_to_purge(should_delete)",
)
# First ensure that we're not about to delete all the forward extremeties
txn.execute(
"SELECT e.event_id, e.depth FROM events as e "
@ -2115,23 +2139,30 @@ class EventsStore(SQLBaseStore):
logger.info("[purge] looking for events to delete")
should_delete_expr = "state_key IS NULL"
should_delete_params = ()
if not delete_local_events:
should_delete_expr += " AND event_id NOT LIKE ?"
should_delete_params += ("%:" + self.hs.hostname, )
should_delete_params += (room_id, topological_ordering)
txn.execute(
"SELECT event_id, state_key FROM events"
" LEFT JOIN state_events USING (room_id, event_id)"
" WHERE room_id = ? AND topological_ordering < ?",
(room_id, topological_ordering,)
"INSERT INTO events_to_purge"
" SELECT event_id, %s"
" FROM events AS e LEFT JOIN state_events USING (event_id)"
" WHERE e.room_id = ? AND topological_ordering < ?" % (
should_delete_expr,
),
should_delete_params,
)
txn.execute(
"SELECT event_id, should_delete FROM events_to_purge"
)
event_rows = txn.fetchall()
to_delete = [
(event_id,) for event_id, state_key in event_rows
if state_key is None and (
delete_local_events or not self.hs.is_mine_id(event_id)
)
]
logger.info(
"[purge] found %i events before cutoff, of which %i can be deleted",
len(event_rows), len(to_delete),
len(event_rows), sum(1 for e in event_rows if e[1]),
)
logger.info("[purge] Finding new backward extremities")
@ -2139,12 +2170,11 @@ class EventsStore(SQLBaseStore):
# We calculate the new entries for the backward extremeties by finding
# all events that point to events that are to be purged
txn.execute(
"SELECT DISTINCT e.event_id FROM events as e"
" INNER JOIN event_edges as ed ON e.event_id = ed.prev_event_id"
" INNER JOIN events as e2 ON e2.event_id = ed.event_id"
" WHERE e.room_id = ? AND e.topological_ordering < ?"
" AND e2.topological_ordering >= ?",
(room_id, topological_ordering, topological_ordering)
"SELECT DISTINCT e.event_id FROM events_to_purge AS e"
" INNER JOIN event_edges AS ed ON e.event_id = ed.prev_event_id"
" INNER JOIN events AS e2 ON e2.event_id = ed.event_id"
" WHERE e2.topological_ordering >= ?",
(topological_ordering, )
)
new_backwards_extrems = txn.fetchall()
@ -2172,12 +2202,11 @@ class EventsStore(SQLBaseStore):
"SELECT state_group FROM event_to_state_groups"
" INNER JOIN events USING (event_id)"
" WHERE state_group IN ("
" SELECT DISTINCT state_group FROM events"
" SELECT DISTINCT state_group FROM events_to_purge"
" INNER JOIN event_to_state_groups USING (event_id)"
" WHERE room_id = ? AND topological_ordering < ?"
" )"
" GROUP BY state_group HAVING MAX(topological_ordering) < ?",
(room_id, topological_ordering, topological_ordering)
(topological_ordering, )
)
state_rows = txn.fetchall()
@ -2262,9 +2291,9 @@ class EventsStore(SQLBaseStore):
)
logger.info("[purge] removing events from event_to_state_groups")
txn.executemany(
"DELETE FROM event_to_state_groups WHERE event_id = ?",
[(event_id,) for event_id, _ in event_rows]
txn.execute(
"DELETE FROM event_to_state_groups "
"WHERE event_id IN (SELECT event_id from events_to_purge)"
)
for event_id, _ in event_rows:
txn.call_after(self._get_state_group_for_event.invalidate, (
@ -2289,22 +2318,35 @@ class EventsStore(SQLBaseStore):
):
logger.info("[purge] removing events from %s", table)
txn.executemany(
"DELETE FROM %s WHERE event_id = ?" % (table,),
to_delete
txn.execute(
"DELETE FROM %s WHERE event_id IN ("
" SELECT event_id FROM events_to_purge WHERE should_delete"
")" % (table,),
)
# event_push_actions lacks an index on event_id, and has one on
# (room_id, event_id) instead.
for table in (
"event_push_actions",
):
logger.info("[purge] removing events from %s", table)
txn.execute(
"DELETE FROM %s WHERE room_id = ? AND event_id IN ("
" SELECT event_id FROM events_to_purge WHERE should_delete"
")" % (table,),
(room_id, )
)
# Mark all state and own events as outliers
logger.info("[purge] marking remaining events as outliers")
txn.executemany(
txn.execute(
"UPDATE events SET outlier = ?"
" WHERE event_id = ?",
[
(True, event_id,) for event_id, state_key in event_rows
if state_key is not None or (
not delete_local_events and self.hs.is_mine_id(event_id)
)
]
" WHERE event_id IN ("
" SELECT event_id FROM events_to_purge "
" WHERE NOT should_delete"
")",
(True,),
)
# synapse tries to take out an exclusive lock on room_depth whenever it
@ -2319,6 +2361,12 @@ class EventsStore(SQLBaseStore):
(topological_ordering, room_id,)
)
# finally, drop the temp table. this will commit the txn in sqlite,
# so make sure to keep this actually last.
txn.execute(
"DROP TABLE events_to_purge"
)
logger.info("[purge] done")
@defer.inlineCallbacks