Horizon Lite - MVP Epic

[jcx120]

Epic: Ingestion Lite

Also known as "Horizon Lite", "On-the-Fly Ingestion", and "The Constant DB solution".

Working Branch: #4352, stellar/go#lighthorizon.

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Acceptance Criteria

The MVP for this feature is an end-to-end deployment of Horizon Lite for a key endpoint:

• GET /accounts/:id/transactions

This is considered a high-impact historical endpoint that accounts for ~30% of all historical requests, based on a previous request analysis.

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Active Task Breakdown

The current Horizon Lite deployment is on Kubernetes:

https://lighthorizon-pubnet.prototypes.kube001.services.stellar-ops.com/

There is a bit of important feature work remaining (besides the backlog), but the primary focus is two parallel threads:

• we need to have at least some per-ledger indices up to see how they compare
• we need to experiment with what we have in order to come up with numbers

Remaining Feature Work

• exp/lighthorizon: Fetch ledgers in parallel whenever possible #4468

Deployment & Experimentation

• Horizon Lite: Generate per-ledger indices for accounts #4567
• Horizon Lite: Automate ledger cache management for the web service. #4526
• Horizon Lite: Understand request latency characteristics #4514
• Dev deployment of Horizon Light  #4493

When we're ready to "get real" on SDF's infrastructure:

• stellar/ops#1818

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Next stage of Epic: #4571