[erlang-questions] release upgrades and code loading

Paul Davis <>
Thu Feb 13 19:36:12 CET 2014


Ah, then I haven't got much other than to suggest asking the relx
group if they've seen similar.

On Thu, Feb 13, 2014 at 12:34 PM, Ivan Uemlianin <> wrote:
> Dear Paul
>
> Thanks for your comment.
>
> Yes, in the relup file everythnig looks in place: load_object_code,
> brutal_purge, code_change up, resume, etc.
>
> Ivan
>
>
>
> On 13/02/2014 18:08, Paul Davis wrote:
>>
>> Have you looked at the generated relup to make sure it includes the
>> appropriate instructions for upgrade the modules in question?
>>
>> On Thu, Feb 13, 2014 at 12:00 PM, Ivan Uemlianin <> wrote:
>>>
>>> Dear All
>>>
>>> I am just getting started with live release upgrades, using relx and
>>> following this tutorial:
>>>
>>>    http://blog.troutwine.us/2013/09/13/trivial_otp_releases.html
>>>
>>> Everything seems to work as advertised, except sometimes I need to
>>> explicitly load the code into the running vm (i.e., using
>>> code_load_file/1)
>>> for the new stuff to take effect.  The function
>>> release_handler:which_releases/0 reports the new release as active and
>>> permanent, but I can see from behaviour that old versions of certain
>>> modules
>>> are still running and handling data.
>>>
>>> I can't be much more specific I'm afraid.  One example: one application
>>> uses
>>> cowboy.  If a release upgrade changes a cowboy resource module, the new
>>> release version might still be running the old version of that module
>>> until
>>> I load_file and purge.
>>>
>>> Why might this be happening?  Am I missing something in the packaging and
>>> upgrade process?  Is there a better way I can write my modules?
>>>
>>> If the information above is too vague, what should I look out for next
>>> time
>>> this happens?
>>>
>>> With thanks and best wishes
>>>
>>> Ivan
>>>
>>>
>>> --
>>> ============================================================
>>> Ivan A. Uemlianin PhD
>>> Llaisdy
>>> Speech Technology Research and Development
>>>
>>>                      
>>>                       www.llaisdy.com
>>>                           llaisdy.wordpress.com
>>>                github.com/llaisdy
>>>                       www.linkedin.com/in/ivanuemlianin
>>>
>>>                          festina lente
>>> ============================================================
>>> _______________________________________________
>>> erlang-questions mailing list
>>> 
>>> http://erlang.org/mailman/listinfo/erlang-questions
>
>
> --
> ============================================================
> Ivan A. Uemlianin PhD
> Llaisdy
> Speech Technology Research and Development
>
>                     
>                      www.llaisdy.com
>                          llaisdy.wordpress.com
>               github.com/llaisdy
>                      www.linkedin.com/in/ivanuemlianin
>
>                         festina lente
> ============================================================



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