In SERVER-17145 an error message was logged without enough context:

 Invariant failure: ret resulted in status UnknownError 2: No such file or directory at src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp 438

Please improve error messages in wired tiger to include the resource, like filename/table/etc., in the error message.

In this example an error message like this would be preferred:

No such file or directory (file:/dir/file.wt, table:blah)