celery sometimes hangs

[Mads Kiilerich]

Confirmed.

As a workaround we watch the queue and restart celery if it grows too 
big ... or if nobody is listening.

I found evidence that this is a known problem with Celery 2. The 
solution should be to upgrade to Celery 3. The API did however change so 
it requires some amount of work.

So far the workaround has been good enough for us and it hasn't made it 
to the top of my todo list.

/Mads


On 07/25/2016 02:01 PM, Thomas De Schampheleire wrote:
> Hi,
>
> We are running Kallithea (some older version, 0.2.1 based) with
> Celery, and sometimes the Celery workers just hang. This is observed
> by e-mails not being received anymore. Restarting celery, or sending
> 'kill -SIGUSR1' to one of them, resolves the problem.
>
> There are several reports on the internet about such problems, but
> could be due to various reasons. Before digging deeper, I would like
> to hear if some of you have or are experiencing the same thing, and
> whether you have solutions.
>
> This is celery 2.2.10, librabbitmq 1.6.1 and RabbitMQ 3.5.0.
>
> Thanks,
> Thomas
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