Github user iilyak commented on a diff in the pull request:
https://github.com/apache/couchdb/pull/309#discussion_r26305273
--- Diff: rel/overlay/etc/default.ini ---
@@ -23,6 +23,7 @@ file_compression = snappy
; and/or more OS page cache hits, but they can also increase overall
response
; time for writes when there are many attachment write requests in
parallel.
attachment_stream_buffer_size = 4096
+db_definitions = [couch_dbs, mem3_dbs, couch_replicator_dbs, cassim_dbs]
--- End diff --
> Why application environment case doesn't works?
Because it relies on [a
hack](https://github.com/apache/couchdb/blob/master/dev/boot_node.erl#L20:L21)
which makes [testing
harder](https://github.com/iilyak/couchdb-couch/blob/2547-fix-broken-tests/src/test_util.erl#L257:L260).
> Can we relay on that if some app wanted to define own system database it
mush have specially named module with implemented behaviour?
Using convention might work but needs to be very well documented and
explained.
> But still...is there no way to avoid exposing such kind of internal
information in config file?
There is also a possibility to discover all modules implementing given
behavior using
`lists:keyfind(behaviour, 1, <module>:module_info(attributes))`. However we
would need to iterate through all modules using `code:all_loaded`. Which gives
us the same problem really. Modules have to be loaded.
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