Thank you for your fast answer Anthony!
You are right, the problem is fixed in master.
I applied those changes and the problem was solved.

Thank you very much!

El miércoles, 6 de junio de 2018, 10:44:42 (UTC-3), Anthony escribió:
>
> I believe this has been fixed in master: 
> https://github.com/web2py/web2py/commit/ea5ea6a30759a2c825f23381540dc396cbc475b7
> .
>
> Anthony
>
> On Wednesday, June 6, 2018 at 9:16:57 AM UTC-4, Lisandro wrote:
>>
>> Quick update: *apparently the problem doesn't happen using 
>> RedisCache(with_lock=False, ...)*
>> Should this be considered a bug or is it the expected behaviour?
>>
>> I would like to keep with_lock=True but avoid that 10 second delay when a 
>> function raises HTTP 503 or 404.
>> The issue with that delay is that, during that time, the request is using 
>> a database connection, and in my environment I have the risk of exhausting 
>> db connections.
>>
>> I'll try to play a bit with the source code of redis_cache.py, but still 
>> any suggestion or comment will be much appreciated.
>> Thanks!
>>
>> El miércoles, 6 de junio de 2018, 9:45:55 (UTC-3), Lisandro escribió:
>>>
>>> Hi there! I recently upgraded my production environment to web2py 
>>> 2.16.1, and I'm facing an old issue that was apparently solved.
>>> In my applications I use @cache.action to cache public pages, and as I 
>>> use Redis for cache, I use it like this:
>>>
>>> @cache.action(time_expire=300, cache_model=cache.redis, session=False, 
>>> vars=False, public=True)
>>> def test():
>>>     ....
>>>
>>>
>>> Well, I've found that, *when the function raises an HTTP 503 or 404, it 
>>> takes 10 seconds to complete and return the result*.
>>> Now, this only happens when cache_model=cache.redis. 
>>> *If I change it to cache_model=cache.ram, it takes a few milliseconds to 
>>> complete as expected.*
>>>
>>> I'm using Redis 3.2.10 64bit on CentOS7.
>>> The problem had been reported long time ago, and it was also fixed:
>>> https://github.com/web2py/web2py/issues/1355
>>>
>>> I've checked my web2py source code, and it's indeed using the latest 
>>> stable version 2.16.1, and just in case, I looked at 
>>> gluon/contrib/redis_cache.py and the fix is there.
>>> However, it appears that the problem still can be reproduced with this 
>>> code:
>>>
>>> from gluon.contrib.redis_cache import RedisCache
>>> from gluon.contrib.redis_session import RedisSession
>>> from gluon.contrib.redis_utils import RConn
>>>
>>> _redis_conn = RConn('localhost', 6379)
>>> cache.redis = RedisCache(redis_conn=_redis_conn, with_lock=True)
>>>
>>> @cache.action(time_expire=300, cache_model=cache.redis, session=False, 
>>> vars=False, public=True)
>>> def test():
>>>     raise HTTP(503)
>>>
>>>
>>> Notice that it always takes 10 seconds, maybe that should bring in some 
>>> clue about what's happening.
>>> Any suggestion?
>>>
>>> Thanks in advance!
>>> Regards, Lisandro
>>>
>>

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