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https://issues.apache.org/jira/browse/JAMES-4064?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benoit Tellier closed JAMES-4064.
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> 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
> Components: pulsar, Queue
> Reporter: Jean Helou
> Assignee: Jean Helou
> Priority: Major
> Fix For: 3.9.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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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