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From Jan Lehnardt <...@apache.org>
Subject Re: CouchDB failing to open socket 5984 ?
Date Wed, 16 Sep 2009 13:31:59 GMT

On 16 Sep 2009, at 15:24, Adam Kocoloski wrote:

> On Sep 16, 2009, at 8:44 AM, Jan Lehnardt wrote:
>
>> On 16 Sep 2009, at 14:21, Adam Kocoloski wrote:
>>
>>> On Sep 16, 2009, at 4:00 AM, Brian Candler wrote:
>>>
>>>> Does this make any sense to you? It looks like it's reading  
>>>> couch.beam from
>>>> couch-0.11.0a815641 (correct), but couch.app from  
>>>> couch-0.9.0a767213 (?!).
>>>
>>> Bingo, there's the problem.  It looks like Erlang's code loader  
>>> wasn't prepared for double-digit minor versions, and it considers  
>>> 0.9.* as newer than 0.1* (including 0.10 and 0.11).
>>>
>>> This may be a serious problem for the 0.10 release, as anyone who  
>>> upgrades from 0.9.x to 0.10.0 using the same install prefix may  
>>> end up with a crash.  Thanks again,
>>
>> We had this popping up on IRC today, again. I agree this is  
>> serious. Is there anything we can do on install time that checks  
>> for older versions?
>
> After some more thought I realized that this isn't a problem for  
> 0.10.  In 0.10 we use the old startup procedure that explicitly adds  
> individual ebin directories to the code path.  In trunk we switched  
> to adding the entire PREFIX/lib/couchdb/erlang/lib directory to  
> ERL_LIBS, and thus triggered the issue with the code loader and our  
> versioning system.

FWIW, the IRC incident update to trunk, which is 0.11.0a. Should we  
open a ticket for this?

Cheers
Jan
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