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From "Adam Kocoloski (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-505) Erlang code path prefers older versions of CouchDB
Date Wed, 16 Sep 2009 15:36:02 GMT
Erlang code path prefers older versions of CouchDB
--------------------------------------------------

                 Key: COUCHDB-505
                 URL: https://issues.apache.org/jira/browse/COUCHDB-505
             Project: CouchDB
          Issue Type: Bug
    Affects Versions: 0.11
         Environment: any system where different minor versions of CouchDB have been installed
to the same --prefix
            Reporter: Adam Kocoloski
            Priority: Blocker
             Fix For: 0.11


We're using ERL_LIBS to add PREFIX/lib/couchdb/erlang/lib to the code path on CouchDB startup.
 If multiple versions of CouchDB have been installed,  that directory might look something
like

mochiweb-r97
ibrowse-1.5.2
couch-0.9.0
couch-0.10.0a
...

In this case, we want the system to use beams from couch-0.10.0a, but apparently Erlang's
code loader sorts couch-0.9.0 higher.  

One solution would be to fall back to explicitly adding specific app directories to the code
path using -pa.

An elegant solution would be to make sure that our app directories are named in such a way
that they automatically sort correctly in the code loader.  I'm not sure this is really possible,
though, particularly when a user is installing development versions built from source next
to released versions.

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