Tellier Benoit created JAMES-1623:
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Summary: 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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