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Bulk PDF download error

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This question has been flagged
developmentconfiguration
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Deyan Stoyanov

Hello, I have the following case:


When sending multiple simultaneous GET requests to Odoo to download invoice PDFs, the system crashes. It takes more than a minute for as few as 20 requests, and while the process continues, Odoo itself is blocked by a 503 error. Even 2 simultaneous requests seem to trouble the system.


Despite this, Odoo seems to not be utilizing the resources provided in the container (the instance runs on Azure in a Kubernetes container).

Increasing workers alone did not help. On the contrary, the process tends to get even heavier with workers=7 as a test.

The process only seems to function properly when we set the workers=0, which is the exact opposite of the recommendations regarding asynchronous work of Odoo.



What may be probable causes for this behavior?


Odoo.conf:

    workers = 2 (every count of workers above 0 does not seem to work)

    max_cron_threads = 2

    limit_memory_soft = 2147483648

    limit_memory_hard = 2684354560

    limit_time_cpu = 180

    limit_time_real = 300

    db_maxconn = 50

    proxy_mode = True
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Cybrosys Techno Solutions Pvt.Ltd
Best Answer
Hi,

PDF generation in Odoo is slow and blocks a worker until it finishes. Many PDFs at the same time will freeze the system.

The container may have a slow or incomplete wkhtmltopdf setup, making PDF creation even heavier.

Odoo report routes are not async, so even small parallel requests can overload workers.

Too many workers for the available CPU cores causes Kubernetes CPU throttling, which slows everything down.

Workers may crash or restart under load because of memory limits, causing 503 errors.

The proxy/ingress setup (Azure > Kubernetes > Odoo) may time out while Odoo is still generating PDFs.

Hope it helps.

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