Benoit Tellier created JAMES-3959:
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Summary: Starting distributed James without OpenSearch
Key: JAMES-3959
URL: https://issues.apache.org/jira/browse/JAMES-3959
Project: James Server
Issue Type: Improvement
Components: elasticsearch
Affects Versions: 3.9.0
Reporter: Benoit Tellier
h3. Why?
While doing some resiliency tests (PRA: Activity Recovery Plan) we noticed that
it is compulsory to have the OpenSearch cluster online in order to start James.
However, in case of disaster, I should be able to start James without having an
OpenSearch cluster online. Indeed, search is a (very) nice to have feature but
not an absolute necessity for sending / receiving mails. And restauring an
OpenSearch service could take significant time. Being able to start without the
OpenSearch cluster would thus allow to significantly accelerate the recovery
plan.
Today one could start even the distributed server in scanning mode, so without
OpenSearch but this is not a good idea for two reasons:
- The search would thus be implemented by scanning entire mailbox thus a few
user doing search could have significant impacts thus worsening the incident.
- The documents to index would be lost and some sorts of full reindexing would
also be needed when coming back online.
h3. Expectations
I expect the following:
- being able to start without OpenSearch
- Search operations hitting the search index fails. But SearchOverrides would
succeed, offering a minimal search service for non search operations eg imap
resynchronisation...
- No index attempt is performed but events would be stored in the right place
in event dead letter to eventually get replayed...
h3. How?
Provide a `opensearch_disabled` search index implementation:
- reject search not satisfied by search overrides
- save events into event dead letter for later processing
h3. Definition of done
Integration tests matching the expectations.
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