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https://issues.apache.org/jira/browse/JAMES-3004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16997459#comment-16997459
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Raphael Ouazana commented on JAMES-3004:
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Solved by https://github.com/linagora/james-project/pull/2983
> Reactor boundedElastic can lead to deadlocks
> --------------------------------------------
>
> Key: JAMES-3004
> URL: https://issues.apache.org/jira/browse/JAMES-3004
> Project: James Server
> Issue Type: Bug
> Reporter: Matthieu Baechler
> Priority: Major
>
> Reactor authors advise users to prefer boundedElastic Scheduler to elastic
> one.
> With https://issues.apache.org/jira/browse/JAMES-2899 we decided to use it as
> it allows to use less threads.
> However, we found that it can lead to deadlocks because of complex starvation
> scenarios.
> The reality is that James is still calling `block` a lot on Mono/Flux for now
> and the advice doesn't stand in the context.
> We can either create a boundedElastic for each usages or revert
> https://issues.apache.org/jira/browse/JAMES-2899 to workaround that risk
> waiting for the day James will be async from end to end.
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