Github user iilyak commented on a diff in the pull request:
https://github.com/apache/couchdb-couch/pull/241#discussion_r109014150
--- Diff: src/couch_db_updater.erl ---
@@ -1323,12 +1326,82 @@ bind_id_tree(Db, Fd, State) ->
Db#db{id_tree=IdBtree}.
-sort_meta_data(Db0) ->
- {ok, Ems} = couch_emsort:merge(Db0#db.id_tree),
- Db0#db{id_tree=Ems}.
+sort_meta_data(Db0, DocCount) ->
+ couch_task_status:update([
+ {phase, sort_ids_init},
+ {total_changes, DocCount},
+ {changes_done, 0},
+ {progress, 0}
+ ]),
+ Ems0 = Db0#db.id_tree,
+ Options = [
+ {event_cb, fun emsort_cb/3},
+ {event_st, {init, 0, 0}}
+ ],
+ Ems1 = couch_emsort:set_options(Ems0, Options),
+ {ok, Ems2} = couch_emsort:merge(Ems1),
+ Db0#db{id_tree=Ems2}.
+
+
+emsort_cb(_Ems, {merge, chain}, {init, Copied, Nodes}) ->
+ {init, Copied, Nodes + 1};
+emsort_cb(_Ems, row_copy, {init, Copied, Nodes}) when Copied >= 1000 ->
+ update_compact_task(Copied + 1),
+ {init, 0, Nodes};
+emsort_cb(_Ems, row_copy, {init, Copied, Nodes}) ->
+ {init, Copied + 1, Nodes};
+emsort_cb(Ems, {merge_start, reverse}, {init, Copied, Nodes}) ->
--- End diff --
I noticed that we can also have `{merge_start, forward}`
[event](https://github.com/apache/couchdb-couch/blob/1db1337301a7c897be41e13cd328270509008478/src/couch_emsort.erl#L246:L252).
Should we handle it as well?
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