Grab bag of Cloudant patches to couch OTP application

- Removal of couch_db and couch_ref_counter processes. Active DBs are
  accessible through a protected ets table owned by couch_server.
- #full_doc_info{} in by_id and by_seq trees for faster compaction at the
  expense of more disk usage afterwards. Proposed as COUCHDB-738 but not
  accepted upstream.
- Replication via distributed Erlang.
- Better hot upgrade support (uses exported functions much more often).
- Configurable btree chunk sizes allow for larger (but still bounded)
  reductions.
- Shorter names for btree fields in #db{} and #db_header{}.
- couch_view_group does not keep a reference to the #db{}.
- Terms are stored compressed (again).

1 files changed, 35 insertions, 0 deletions

diff --git a/apps/couch/src/couch_secondary_sup.erl b/apps/couch/src/couch_secondary_sup.erl
new file mode 100644
index 00000000..8ccbd799
--- /dev/null
+++ b/apps/couch/src/couch_secondary_sup.erl
@@ -0,0 +1,35 @@
+-module(couch_secondary_sup).
+-behaviour(supervisor).
+-export([init/1, start_link/0]).
+
+start_link() ->
+    supervisor:start_link({local,couch_secondary_services}, ?MODULE, []).
+init([]) ->
+    SecondarySupervisors = [
+        {couch_db_update_notifier_sup,
+            {couch_db_update_notifier_sup, start_link, []},
+            permanent,
+            infinity,
+            supervisor,
+            [couch_db_update_notifier_sup]},
+        {couch_metrics_event_manager,
+            {gen_event, start_link, [{local, couch_metrics_event_manager}]},
+            permanent,
+            brutal_kill,
+            worker,
+            dynamic}
+    ],
+    Children = SecondarySupervisors ++ [
+        begin
+            {ok, {Module, Fun, Args}} = couch_util:parse_term(SpecStr),
+
+            {list_to_atom(Name),
+                {Module, Fun, Args},
+                permanent,
+                brutal_kill,
+                worker,
+                [Module]}
+        end
+        || {Name, SpecStr}
+        <- couch_config:get("daemons"), SpecStr /= ""],
+    {ok, {{one_for_one, 10, 3600}, Children}}.