Github user davisp commented on the issue:
https://github.com/apache/couchdb-couch/pull/217
Here's a micro benchmark that shows a significant speedup for the new
version. Between 1,000% and 6,000% depending on whether it actually has to
remove the suffix.
```erlang
-module(benchmark).
-export([
go/0,
drop_dot_couch_ext/1,
maybe_remove_extension/1
]).
-define(TEST_1,
<<"shards/00000000-1fffffff/example/c28fb579-0a4c-4421-8d44-65a7650b6da0.1475265285">>).
-define(TEST_2,
<<"shards/00000000-1fffffff/example/c28fb579-0a4c-4421-8d44-65a7650b6da0.1475265285.couch">>).
go() ->
Tests = [
fun() -> run_drop(?TEST_1, 1000) end,
fun() -> run_drop(?TEST_2, 1000) end,
fun() -> run_maybe(?TEST_1, 1000) end,
fun() -> run_maybe(?TEST_2, 1000) end
],
lists:foreach(fun(T) ->
R = timer:tc(T),
io:format("~p~n", [R])
end, Tests).
run_drop(_Test, 0) ->
ok;
run_drop(Test, Count) ->
?TEST_1 = drop_dot_couch_ext(Test),
run_drop(Test, Count - 1).
run_maybe(_Test, 0) ->
ok;
run_maybe(Test, Count) ->
?TEST_1 = maybe_remove_extension(Test),
run_maybe(Test, Count - 1).
drop_dot_couch_ext(DbName) when is_binary(DbName) ->
PrefixLen = size(DbName) - 6,
case DbName of
<<Prefix:PrefixLen/binary, ".couch">> ->
Prefix;
Else ->
Else
end;
drop_dot_couch_ext(DbName) when is_list(DbName) ->
binary_to_list(drop_dot_couch_ext(iolist_to_binary(DbName))).
maybe_remove_extension(DbName) ->
case filename:extension(DbName) of
<<".couch">> ->
filename:rootname(DbName);
_ ->
DbName
end.
```
```
Eshell V6.4.1.5 (abort with ^G)
1> benchmark:go().
{141,ok}
{124,ok}
{1285,ok}
{5673,ok}
ok
```
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