[JAMES-3406] Documentation page - distributed James consistency model

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Done
• Fix Version/s: 3.6.0
• Component/s: cassandra, Documentation, elasticsearch, guice, rabbitmq
• Assignee: Unassigned
• Reporter: Benoit Tellier
• Created: 06/Oct/20 07:41
• Updated: 14/Oct/20 02:32
• Resolved: 12/Oct/20 07:49

Description

Document, in a dedicated section of the new documentation website the consistency model (`/docs/modules/servers/pages/distributed/architecture/consistency-model.md`)

• Data Replication
• Words about Cassandra consistency model
• Words about ElasticSearch consistency model
• Discourage General usage Cassandra MultiDC set-up (because of Lightweight Transaction)
• De-normalization
• Which data is denormalized ?
• What can go wrong (denormalization inconsistencies) ?
• `Solve Inconsistency tasks`
• Applicative read repairs
• Consistency across data stores
• Write to object storage first, then position Cassandra meta-data
• Cassandra <=> ElasticSearch: point to the EventBus (async, retries, dead-letter) + reIndex
• Recovering RabbitMQ mailQueue from the Cassandra projection

Don't forget to point/reuse existing ADRs !