[GitHub] [couchdb] pgj commented on a diff in pull request #4643: Improve emitted change feed sequence after a split

["pgj (via GitHub)" <gi...@apache.org>]

pgj commented on code in PR #4643:
URL: https://github.com/apache/couchdb/pull/4643#discussion_r1232017156


##########
src/fabric/src/fabric_view_changes.erl:
##########
@@ -425,6 +425,15 @@ pack_seqs(Workers) ->
     Opaque = couch_util:encodeBase64Url(?term_to_bin(SeqList, [compressed])),
     ?l2b([integer_to_list(SeqSum), $-, Opaque]).
 
+% When we get sequence before the split, we'll fill in the missing (now split)
+% ranges with a special {split, OldNodeUUid} marker. However, when sequences
+% are emitted in the changes API, that will make the N- prefix (SeqSum) bounce
+% around from higher to lower numbers, while users expect those to be mostly
+% incrementing. So take a conservative approach and assume it will be full
+% rewind for that ramge, and use 0 for that range. This is a purely cosmetic

Review Comment:
   s/ramge/range/



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