Comments

1 files changed, 16 insertions, 14 deletions

diff --git a/synapse/storage/chunk_ordered_table.py b/synapse/storage/chunk_ordered_table.py

index d9e331a75d..79d0ca44ec 100644
--- a/synapse/storage/chunk_ordered_table.py
+++ b/synapse/storage/chunk_ordered_table.py
@@ -33,20 +33,22 @@ class ChunkDBOrderedListStore(OrderedListStore):
     """Used as the list store for room chunks, efficiently maintaining them in
     topological order on updates.
 
-    A room chunk is a connected portion of the room events DAG. As such the set
-    of chunks in a room inherits a DAG, i.e. if an event in one chunk references
-    an event in a second chunk, then we say that the first chunk references the
-    second, and thus forming a DAG.
-
-    Chunks are constructed so that they have the aditional property that for all
-    events in the chunk, either all of their prev_events are in that chunk or
-    none of them are. This ensures that no event that is subsequently received
-    needs to be inserted into the middle of a chunk, since it cannot both
-    reference an event in the chunk and be referenced by an event in the chunk
-    (assuming no cycles).
-
-    Multiple chunks can therefore happen when the server misses some events,
-    e.g. due to the server being offline for a time.
+    A room chunk is a connected portion of the room events DAG. Chunks are
+    constructed so that they have the additional property that for all events in
+    the chunk, either all of their prev_events are in that chunk or none of them
+    are. This ensures that no event that is subsequently received needs to be
+    inserted into the middle of a chunk, since it cannot both reference an event
+    in the chunk and be referenced by an event in the chunk (assuming no
+    cycles).
+
+    As such the set of chunks in a room inherits a DAG, i.e. if an event in one
+    chunk references an event in a second chunk, then we say that the first
+    chunk references the second, and thus forming a DAG. (This means that chunks
+    start off disconnected until an event is received that connects the two
+    chunks.)
+
+    We can therefore end up with multiple chunks in a room when the server
+    misses some events, e.g. due to the server being offline for a time.
 
     The server may only have a subset of all events in a room, in which case
     its possible for the server to have chunks that are unconnected from each