Jean Helou created JAMES-4064:
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Summary: Mailqueue filters should not use durable subscriptions
Key: JAMES-4064
URL: https://issues.apache.org/jira/browse/JAMES-4064
Project: James Server
Issue Type: Sub-task
Reporter: Jean Helou
Removal in a distributed system requires a way to distribute the filters to the
various instances of the mailqueue. This was implemented by pushing filters in
a dedicated pulsar topic.
Since each instance needs to read the topic from the start to compile all the
filters, it is necessary to have unique names for an exclusive subscription
(see [https://pulsar.apache.org/docs/3.3.x/concepts-messaging/#subscriptions)]
If the instances used a shared subscription they would not receive filters that
have already been received by other members of the subscription.
The current implementation uses Durable subscriptions and the uniqueness of the
name is generated by adding an UUID. Unfortunately this means that a server
restart will create a new subscription and the previous one will remain forever.
I recently discovered that pulsar has a limit on the total number of durable
subscriptions :D eventually preventing the creation of new ones.
The filters should be migrated to non durable subscriptions (see
[https://pulsar.apache.org/docs/3.3.x/concepts-messaging/#subscription-modes)]
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