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Merge pull request #3856 from matrix-org/erikj/speed_up_purge

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Make purge history slightly faster
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Erik Johnston 2018-09-13 16:14:46 +01:00 committed by GitHub
commit 6c0f8d9d50
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2 changed files with 29 additions and 16 deletions
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1
changelog.d/3856.misc Normal file
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@ -0,0 +1 @@
Speed up purge history for rooms that have been previously purged

44
synapse/storage/events.py
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@ -1890,20 +1890,6 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
")"
)
# 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)",
)
# We do joins against events_to_purge for e.g. calculating state
# groups to purge, etc., so lets make an index.
txn.execute(
"CREATE INDEX events_to_purge_id"
" ON events_to_purge(event_id)",
)
# 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 "
@ -1930,19 +1916,45 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
should_delete_params = ()
if not delete_local_events:
should_delete_expr += " AND event_id NOT LIKE ?"
should_delete_params += ("%:" + self.hs.hostname, )
# We include the parameter twice since we use the expression twice
should_delete_params += (
"%:" + self.hs.hostname,
"%:" + self.hs.hostname,
)
should_delete_params += (room_id, token.topological)
# Note that we insert events that are outliers and aren't going to be
# deleted, as nothing will happen to them.
txn.execute(
"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 < ?" % (
" WHERE (NOT outlier OR (%s)) AND e.room_id = ? AND topological_ordering < ?"
% (
should_delete_expr,
should_delete_expr,
),
should_delete_params,
)
# We create the indices *after* insertion as that's a lot faster.
# 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)",
)
# We do joins against events_to_purge for e.g. calculating state
# groups to purge, etc., so lets make an index.
txn.execute(
"CREATE INDEX events_to_purge_id"
" ON events_to_purge(event_id)",
)
txn.execute(
"SELECT event_id, should_delete FROM events_to_purge"
)