[Bifrost] read correctly handles seal and tail instability #1724
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A restructure the allows finer-grain control over what types loglet providers have access to. This will be exploited more in upcoming PRs.
- Major cleanup of loglet error handling, this removes the unnecessary leakage of internal loglet error types to bifrost. - No more superflous `Arc<>` of non-Clone errors. - FindTail on loglets cannot return Sealed error (enforcement via type-system)
This also adds an optional limit to loglet readstreams to enable creating a readstream with a pre-determined end offset.
In preparation to allow multi-segment chains, local loglets in single-node bootstrap now get unique random ids.
In preparation for the bifrost read_opt to be removed and replaced with `read()`
- Segments return the known tail_lsn which gets propagated to downstream components. - Renaming `read_opt()` to replace `read()` and making the non-blocking `read()` the de-facto way to read individual records. Readstream will be the only way for tailing readers. - Implements the intricate handling of `read()` during in-flight reconfiguration. This now requires bifrost to determine a safe known tail before allowing the `read()` to take place.
This was referenced Jul 18, 2024
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[Bifrost] read correctly handles seal and tail instability
read_opt()to replaceread()and making the non-blockingread()the de-facto way to read individual records. Readstream will be the only way for tailing readers.read()during in-flight reconfiguration. This now requires bifrost to determine a safe known tail before allowing theread()to take place.Stack created with Sapling. Best reviewed with ReviewStack.