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https://issues.apache.org/jira/browse/JAMES-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14905516#comment-14905516
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Tellier Benoit commented on JAMES-1623:
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Related issues : MPT-28 and MAILBOX-253
> Provide the option to use Hystrix on top of all IO operations
> -------------------------------------------------------------
>
> Key: JAMES-1623
> URL: https://issues.apache.org/jira/browse/JAMES-1623
> Project: James Server
> Issue Type: New Feature
> Reporter: Tellier Benoit
>
> Hystrix is a Netflix developped librairy for fault tolerance in distributed
> instances.
> It provides automatic circuit breaking, meaning that your underlying database
> can not be overloaded, leading to a crash. (Same thing for ElasticSearch, by
> the way).
> It also allows fallback if circuit is closed.
> Finally, it allows live metrics on a dashboard.
> And on top of that behaviour of hystrix is live configurable!
> My point of view about this librairy, is that :
> It will help sysadmins to diagnose problems and design for their load.
> It will help us (James developpers) to identify hotspots in the code and
> maybe design better interaction with our underlying data source.
> It will make James more resiliant to failures.
> I conseder external IO to be :
> MessageMapper and MailboxMapper from mailbox
> Search indexes from mailbox
> data-*
> quotas from mailbox
> I already have working implementations for all of those and strong mocked
> unit tests.
> Acceptance criteria :
> whatever implementation I choose for each component, I can enable hystrix
> wrapping by a single configuration line.
> provide MPT testing on top of memory implementation
> publish metrics to be accessible with a hystrix dashboard
> ( if I have time ) - provide a video of the dashboard
> modify documentation about configuration changes.
> Blocking point :
> Implementing Hystrix wrapping is trivial and non invasive
> Implementing configuration should be straight forward
> I will have troubbles with servlets (needed to publish metrics). I was
> thinking to jetty, but I have strictly no idea how to deploy it ( and their
> doc seems like a mess). Any help appreciated !
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