[14.0] Support multi-nodes with lock on jobrunner #15
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Starting several odoo (main) processes with "--load=web,queue_job"
was unsupported, as it would start several job runner, which would all
listen to postgresql notifications and try to enqueue jobs in concurrent
workers.
This is an issue in several cases:
* it causes issues on odoo.sh that uses an hybrid model for workers
and starts several job runners [0]
* it defeats any setup that would use several nodes to keep the service
available in case of failure of a node/host
The solution implemented here is using a PostgreSQL advisory lock,
at session level in a connection on the "postgres" database, which
ensure 2 job runners are not working on the same set of databases.
At loading, the job runner tries to acquire the lock. If it can, it
initializes the connection and listen for jobs. If the lock is taken
by another job runner, it waits and retry to acquire it every 30
seconds.
Example when a job runner is started and another one starts:
INFO ? odoo.addons.queue_job.jobrunner.runner: starting
INFO ? odoo.addons.queue_job.jobrunner.runner: already started on another node
The shared lock identifier is computed based on the set of databases
the job runner has to listen to: if a job runner is started with
``--database=queue1`` and another with ``--database=queue2``, they will
have different locks and such will be able to work in parallel.
Important: new databases need a restart of the job runner. This was
already the case, and would be a great improvement, but is out of
scope for this improvement.
[0] OCA#169 (comment)
rconjour
approved these changes
May 17, 2021
StefanRijnhart
approved these changes
May 17, 2021
StefanRijnhart
approved these changes
May 17, 2021
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Forward port of OCA#256
Copy of OCA#346