Whitespace. Call wterl:drop not truncate for drop calls and set force

to true when calling so that we ignore ENOENT.  Change the session estimate
down a bit.

c_src/wterl.c

@@ -1264,11 +1264,18 @@ ASYNC_NIF_DECL(
     WT_CURSOR* cursor;
     rc = session->open_cursor(session, args->uri, NULL, (config.data[0] != 0) ? (char *)config.data : "overwrite,raw", &cursor);
     if (rc != 0) {
+      session->close(session, NULL);
       ASYNC_NIF_REPLY(__strerror_term(env, rc));
       return;
     }
 
     WterlCursorHandle* cursor_handle = enif_alloc_resource(wterl_cursor_RESOURCE, sizeof(WterlCursorHandle));
+    if (!cursor_handle) {
+      cursor->close(cursor);
+      session->close(session, NULL);
+      ASYNC_NIF_REPLY(__strerror_term(env, ENOMEM));
+      return;
+    }
     cursor_handle->session = session;
     cursor_handle->cursor = cursor;
     ERL_NIF_TERM result = enif_make_resource(env, cursor_handle);
@@ -1304,9 +1311,10 @@ ASYNC_NIF_DECL(
     WT_CURSOR *cursor = args->cursor_handle->cursor;
     WT_SESSION *session = args->cursor_handle->session;
     /* Note: session->close() will cause all open cursors in the session to be
-       closed first, so we don't have explicitly to do that here. */
-    int rc = cursor->close(cursor);
-    (void)session->close(session, NULL);
+       closed first, so we don't have explicitly to do that here.
+       rc = cursor->close(cursor);
+    */
+    int rc = session->close(session, NULL);
     ASYNC_NIF_REPLY(rc == 0 ? ATOM_OK : __strerror_term(env, rc));
   },
   { // post

src/riak_kv_wterl_backend.erl

@@ -310,7 +310,7 @@ fold_objects(FoldObjectsFun, Acc, Opts, #state{connection=Connection, table=Tabl
 %% @doc Delete all objects from this wterl backend
 -spec drop(state()) -> {ok, state()} | {error, term(), state()}.
 drop(#state{connection=Connection, table=Table}=State) ->
-    case wterl:truncate(Connection, Table) of
+    case wterl:drop(Connection, Table) of
         ok ->
             {ok, State};
         Error ->
@@ -355,7 +355,7 @@ max_sessions(Config) ->
             undefined -> 1024;
             Size -> Size
         end,
-    Est = 1000 * (RingSize * erlang:system_info(schedulers)), % TODO: review/fix this logic
+    Est = 100 * (RingSize * erlang:system_info(schedulers)), % TODO: review/fix this logic
     case Est > 1000000000  of % Note: WiredTiger uses a signed int for this
         true -> 1000000000;
         false -> Est

src/wterl.erl

@@ -147,7 +147,7 @@ create_nif(_AsyncNif, _Ref, _Name, _Config) ->
 -spec drop(connection(), string()) -> ok | {error, term()}.
 -spec drop(connection(), string(), config_list()) -> ok | {error, term()}.
 drop(Ref, Name) ->
-    drop(Ref, Name, []).
+    drop(Ref, Name, [{force, true}]).
 drop(Ref, Name, Config) ->
     ?ASYNC_NIF_CALL(fun drop_nif/4, [Ref, Name, config_to_bin(Config)]).