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Comment on the maxStateDataNIDs

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Mark Haines 2017-02-14 13:40:47 +00:00
parent 8b71dd7125
commit 67b261d32c
1 changed files with 5 additions and 0 deletions
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src/github.com/matrix-org/dendrite/roomserver/input/state.go
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@ -68,6 +68,11 @@ func calculateAndStoreState(
return calculateAndStoreStateMany(db, roomNID, prevStates)
}
// maxStateDataNIDs is the maximum number of state data blocks to use to encode a snapshot of room state.
// Increasing this number means that we can encode more of the state changes as simple deltas which means that
// we need fewer entries in the state data table. However making this number bigger will increase the size of
// the rows in the state table itself and will require more index lookups when retrieving a snapshot.
// TODO: Tune this to get the right balance between size and lookup performance.
const maxStateDataNIDs = 64
func calculateAndStoreStateMany(db RoomEventDatabase, roomNID types.RoomNID, prevStates []types.StateAtEvent) (types.StateSnapshotNID, error) {