clean up comments

client/src/core/client/stream/tabs/Comments/Stream/AllCommentsTab/AllCommentsTabContainer.tsx

@@ -246,7 +246,8 @@ export const AllCommentsTabContainer: FunctionComponent<Props> = ({
   const commentSeenEnabled = useCommentSeenEnabled();
   // calling loadMore will query GraphQL for 10 more comments
   // (at the time of this writing, pagination queries are quite slow
-  // and values higher than 10 sometimes take as long as 10 seconds)
+  // and values higher than 10 sometimes take as long as 10 seconds),
+  // depending on how many comment replies must be recursively fetched
   const [loadMore, isLoadingMore] = useLoadMore(relay, 10);
   const beginLoadMoreEvent = useViewerNetworkEvent(LoadMoreAllCommentsEvent);
   const beginViewNewCommentsEvent = useViewerNetworkEvent(

server/src/core/server/graph/loaders/Comments.ts

@@ -352,15 +352,8 @@ export default (ctx: GraphContext) => ({
     const isArchived = !!(story.isArchived || story.isArchiving);
     const cacheAvailable = await ctx.cache.available(ctx.tenant.id);
 
-    // the following code
-
-    // regardless of cacheAvailable, we want to paginate the first call to prevent loading all comments at once
-    // subsequent calls (for more is 15 comments) should retrieve from cache if the totalComments are fewer than 500
-    // and should paginate via mongo if the totalComments are greater than 500
-
-    // if the story is archived or has a relatively large number of comments,
-    // comments will be paginated via queries to Mongo
-
+    // Regardless of cacheAvailable (true when DATA_CACHE is enabled),
+    // we want to conditionally paginate the first call to prevent loading too many comments at once.
     if (
       !cacheAvailable ||
       isRatingsAndReviews(ctx.tenant, story) ||
@@ -510,7 +503,7 @@ export default (ctx: GraphContext) => ({
         ctx.tenant.id,
         comment,
         {
-          first: 9999, // seems like lowering this doesn't help reduce Redis operations
+          first: 9999,
           orderBy: defaultTo(orderBy, GQLCOMMENT_SORT.CREATED_AT_ASC),
         },
         story.isArchived