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/sync performance optimizations (#2927)

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Since #2849 there is no limit for the current state we fetch to
calculate history visibility. In large rooms this can cause us to fetch
thousands of membership events we don't really care about.
This now only gets the state event types and senders in our timeline,
which should significantly reduce the amount of events we fetch from the
database.

Also removes `MaxTopologicalPosition`, as it is an unnecessary DB call,
given we use the result in `topological_position < $1` calls.
This commit is contained in:
Till 2023-01-17 10:08:23 +01:00 • committed by GitHub
parent 8582c7520a
commit 0d0280cf5f
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11 changed files with 372 additions and 105 deletions
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16
syncapi/storage/sqlite3/output_room_events_topology_table.go
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@ -61,10 +61,6 @@ const selectPositionInTopologySQL = "" +
"SELECT topological_position, stream_position FROM syncapi_output_room_events_topology" +
" WHERE event_id = $1"
const selectMaxPositionInTopologySQL = "" +
"SELECT MAX(topological_position), stream_position FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 ORDER BY stream_position DESC"
const selectStreamToTopologicalPositionAscSQL = "" +
"SELECT topological_position FROM syncapi_output_room_events_topology WHERE room_id = $1 AND stream_position >= $2 ORDER BY topological_position ASC LIMIT 1;"
@ -77,7 +73,6 @@ type outputRoomEventsTopologyStatements struct {
selectEventIDsInRangeASCStmt *sql.Stmt
selectEventIDsInRangeDESCStmt *sql.Stmt
selectPositionInTopologyStmt *sql.Stmt
selectMaxPositionInTopologyStmt *sql.Stmt
selectStreamToTopologicalPositionAscStmt *sql.Stmt
selectStreamToTopologicalPositionDescStmt *sql.Stmt
}
@ -102,9 +97,6 @@ func NewSqliteTopologyTable(db *sql.DB) (tables.Topology, error) {
if s.selectPositionInTopologyStmt, err = db.Prepare(selectPositionInTopologySQL); err != nil {
return nil, err
}
if s.selectMaxPositionInTopologyStmt, err = db.Prepare(selectMaxPositionInTopologySQL); err != nil {
return nil, err
}
if s.selectStreamToTopologicalPositionAscStmt, err = db.Prepare(selectStreamToTopologicalPositionAscSQL); err != nil {
return nil, err
}
@ -182,11 +174,3 @@ func (s *outputRoomEventsTopologyStatements) SelectStreamToTopologicalPosition(
}
return
}
func (s *outputRoomEventsTopologyStatements) SelectMaxPositionInTopology(
ctx context.Context, txn *sql.Tx, roomID string,
) (pos types.StreamPosition, spos types.StreamPosition, err error) {
stmt := sqlutil.TxStmt(txn, s.selectMaxPositionInTopologyStmt)
err = stmt.QueryRowContext(ctx, roomID).Scan(&pos, &spos)
return
}