Improve error handling in ClusterVNode and refactor TFChunkDb processing

[yordis]

Changed: Added error handling in StartNode method to throw the first inner exception from AggregateException.

Signed-off-by: Yordis Prieto yordis.prieto@gmail.com

[cursor]

PR Summary

Low Risk
Mostly restructures exception propagation during startup/DB open; behavior should be equivalent but could slightly change which exception type bubbles up in parallel chunk-loading failures.

Overview
Improves startup error surfacing by wrapping ClusterVNode's StartNode to unwrap AggregateException and rethrow the first inner exception, making failures easier to diagnose.

Refactors TFChunkDb.Open chunk-loading parallel loop to remove the surrounding try/catch unwrapping logic and rely on Parallel.ForEachAsync exception propagation while keeping the chunk selection/completion logic the same.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The PR modifies error handling and chunk loading logic across two core files. ClusterVNode.cs adds a defensive exception-flattening wrapper around node startup. TFChunkDb.cs refactors parallel chunk loading by removing outer exception handling and consolidating chunk creation branching paths based on completion state.

Changes

Cohort / File(s)	Summary
Node Startup Error Handling src/EventStore.Core/ClusterVNode.cs	Added defensive try-catch wrapper in StartNode that flattens AggregateException by rethrowing the first inner exception. Extracted original logic into StartNodeCore local function to separate error handling from core startup sequence.
Chunk Loading Refactoring src/EventStore.Core/TransactionLog/Chunks/TFChunkDb.cs	Removed outer try-catch around Parallel.ForEachAsync. Consolidated per-chunk processing by introducing conditional branching for checkpoint boundary cases to decide between FromCompletedFile vs. FromOngoingFile paths. Eliminated nested conditionals and unified chunk creation flow with single addition point to chunk manager.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Convert VerifyFileHash and FromCompletedFile to async #23: Overlaps with TFChunk loading and verification paths, involving FromCompletedFile/VerifyFileHash refactoring in chunk creation flow.

Poem

🐰 A node starts clean with error grace,
Flattening exceptions in their place,
While chunks align in simpler ways,
No nested tangles in the maze!
Control flows smooth, conditions clear—
The EventStore refactors here! ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/unwrap-aggregate-exception-157

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