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https://issues.apache.org/jira/browse/JAMES-3266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157879#comment-17157879
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René Cordier commented on JAMES-3266:
-------------------------------------
[https://github.com/linagora/james-project/pull/3425] contributed to disable ES
in distributed James
> Distributed James: make ElasticSearch indexing optional?
> --------------------------------------------------------
>
> Key: JAMES-3266
> URL: https://issues.apache.org/jira/browse/JAMES-3266
> Project: James Server
> Issue Type: New Feature
> Components: elasticsearch, guice
> Affects Versions: master
> Reporter: Benoit Tellier
> Priority: Major
> Fix For: 3.6.0
>
>
> {code:java}
> Raphaël Ouazana-Sustowski Thu, 11 Jun 2020 09:02:24 -0700
> Hi,
> Here is a proposal to make ElasticSearch optional in our distributed
> product/flavor/server.
> Comments are welcome.
> ## Why?
> Some people have expressed the need of using a distributed James without
> ElasticSearch:
> - in some comment here: https://issues.apache.org/jira/browse/JAMES-3086
> - one of our customers plan to deploy a distributed James server for serving
> POP3 encrypted emails. This deployment does not rely on searching features.
> However as part of current Distributed James server he is forced to rely on
> ElasticSearch email indexing.
> This results in wasted resources as maintaining an ElasticSearch cluster to
> keep up with the volume is expensive. Maintaining an ElasticSearch cluster
> when not needed is costly at several levels:
> - cost of infrastructure to deploy it
> - cost of people having to maintain it
> - performance cost on James to unnecessarily index data
> ## How ?
> Scanning search is a search implementation that is running on top of any
> mailbox implementation, even distributed ones and does not require to index
> data.
> Scanning Search is tested both at the component level (unit test) but also
> passes IMAP (MPT) tests on top of Cassandra implementation, as well as JMAP
> memory tests, thus delivers correct results. Of course it does not support
> full text search.
> We should allow Distributed James to optionally rely on scanning search
> instead of ElasticSearch.
> - Scanning search should be advised for deployments rarely searching data
> - ElasticSearch should be advised when search is frequent or requires high
> performance
> We could use module choosing [1] to choose between scanning search and
> ElasticSearch.
> To be noted that scanning search introduces no other dependencies as it is
> part of mailbox-store thus causes no risk of library clashes.
> To be noted also that metric collection and log collection using
> ElasticSearch is unaffected.
> ## Alternative
> The alternative would be to build a different product/flavor/server than the
> distributed one, where the only difference with the distributed one is that
> indexing will rely on scanning instead of ElasticSearch.
> The maintenance cost of such a product/flavor/server is higher than of a
> configuration option (Docker images to release, time and energy to run
> integration tests on it).
> Such a product/flavor is hard to brand because even if it answers a need, it
> is not so far of the distributed one, and does not answer needs that are very
> far from it neither.
> The advantage is that is would allow to more fine tune this solution to
> answer to the exact needs.
> ## Work in Progress
> See pull request: https://github.com/linagora/james-project/pull/3425
> Regards,
> Raphaël.
> [1]
> https://github.com/apache/james-project/blob/master/src/adr/0036-against-use-of-conditional-statements-in-guice-modules.md
> {code}
> Mailing list thread:
> https://www.mail-archive.com/server-dev@james.apache.org/msg66319.html
> PR: https://github.com/linagora/james-project/pull/3425
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