[erlang-questions] release upgrades and code loading

[Ivan Uemlianin]

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--
festina lente


> On 13 Feb 2014, at 19:35, Mike Oxford <moxford@REDACTED> wrote:
> 
>  [{"1.0.6",[],
>    [{load_object_code,{app1,"20140213.1",[app1]}},
>     {load_object_code,{app2,"20140213.1",[app2]}},
> 
> Replacing a version with itself? 
> 
> 
> 
>> On Thu, Feb 13, 2014 at 11:03 AM, Ivan Uemlianin <ivan@REDACTED> wrote:
>> Dear Mike
>> 
>> Thanks for your help.
>> 
>> Here's a recent relup.  After this upgrade, I had to manually code_load and purge app1:
>> 
>> {"1.0.7",
>>  [{"1.0.6",[],
>>    [{load_object_code,{app1,"20140213.1",[app1]}},
>>     {load_object_code,{app2,"20140213.1",[app2]}},
>>     point_of_no_return,
>>     {suspend,[app1]},
>>     {load,{app1,brutal_purge,brutal_purge}},
>>     {code_change,up,[{app1,[from1to2]}]},
>>     {resume,[app1]},
>>     {suspend,[app2]},
>>     {load,{app2,brutal_purge,brutal_purge}},
>>     {code_change,up,[{app2,[from1to2]}]},
>>     {resume,[app2]}]}],
>>  [{"1.0.6",[],
>>    [{load_object_code,{app1,"20140211.1",[app1]}},
>>     {load_object_code,{app2,"20140207.1",[app2]}},
>>     point_of_no_return,
>>     {suspend,[app1]},
>>     {code_change,down,[{app1,[from2to1]}]},
>>     {load,{app1,brutal_purge,brutal_purge}},
>>     {resume,[app1]},
>>     {suspend,[app2]},
>>     {code_change,down,[{app2,[from2to1]}]},
>>     {load,{app2,brutal_purge,brutal_purge}},
>>     {resume,[app2]}]}]}.
>> 
>> Best wishes
>> 
>> Ivan
>> 
>> 
>> 
>>> On 13/02/2014 18:54, Mike Oxford wrote:
>>> Is your brutal_purge on the PostPurge or the PrePurge?
>>> 
>>> 
>>> On Thu, Feb 13, 2014 at 10:00 AM, Ivan Uemlianin <ivan@REDACTED
>>> <mailto:ivan@REDACTED>> 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
>>> 
>>>     <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
>>> 
>>>     ivan@REDACTED <mailto:ivan@REDACTED>
>>>     www.llaisdy.com <http://www.llaisdy.com>
>>>     llaisdy.wordpress.com <http://llaisdy.wordpress.com>
>>>     github.com/llaisdy <http://github.com/llaisdy>
>>>     www.linkedin.com/in/__ivanuemlianin
>>>     <http://www.linkedin.com/in/ivanuemlianin>
>>> 
>>>                              festina lente
>>>     ==============================__==============================
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>> 
>> -- 
>> ============================================================
>> Ivan A. Uemlianin PhD
>> Llaisdy
>> Speech Technology Research and Development
>> 
>>                     ivan@REDACTED
>>                      www.llaisdy.com
>>                          llaisdy.wordpress.com
>>               github.com/llaisdy
>>                      www.linkedin.com/in/ivanuemlianin
>> 
>>                         festina lente
>> ============================================================
> 
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