ptr.pet
at protocol indexer with flexible filtering, xrpc queries, and a cursor-backed event stream, built on fjall
at-protocol
atproto
indexer
rust
fjall
[docs] clarify backfill comparison in readme vs tap
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README.md
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README.md
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| aspect | `tap` (`/channel`) | `hydrant` (`/stream`) |
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| :--- | :--- | :--- |
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| distribution | sharded work queue: events are load-balanced across connected clients. If 5 clients connect, each receives ~20% of events. | broadcast: every connected client receives a full copy of the event stream. If 5 clients connect, all 5 receive 100% of events. |
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| cursors | server-managed: clients ACK messages. The server tracks progress and redelivers unacked messages. | client-managed: client provides `?cursor=123`. The server streams from that point. |
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| backfill | integrated queue: backfill events are mixed into the live queue and prioritized by the server. | unified log: backfill simply inserts "historical" events (`live: false`) into the global event log. streaming is just reading this log sequentially. |
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| distribution | sharded work queue: events are load-balanced across connected clients. If 5 clients connect, each receives ~20% of events. | broadcast: every connected client receives a full copy of the event stream. if 5 clients connect, all 5 receive 100% of events. |
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| cursors | server-managed: clients ACK messages. the server tracks progress and redelivers unacked messages. | client-managed: client provides `?cursor=123`. the server streams from that point. |
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| backfill | backfill events are mixed into the live queue and prioritized (per-repo, acting as synchronization barrier) by the server. | backfill simply inserts historical events (`live: false`) into the global event log. streaming is just reading this log sequentially. synchronization is the same as tap, `live: true` vs `live: false`. |
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| event types | `record`, `identity` (includes status) | `record`, `identity` (handle), `account` (status) |
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| persistence | **full**: all events are stored and replayable. | **hybrid**: `record` events are persisted/replayable. `identity`/`account` are ephemeral/live-only. |
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