perf: Phase 2 lazy StoredMessage materialization in FileStore

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Replace eager Dictionary<ulong, StoredMessage> with lightweight
Dictionary<ulong, MessageMeta> to eliminate ~200B StoredMessage
allocation per message on the write path.

- Add MessageMeta struct (BlockId, Subject, PayloadLength, HeaderLength,
  TimestampNs) — ~40B vs ~200B for StoredMessage
- Add MaterializeMessage(seq) for on-demand reconstruction from blocks
- Update all ~60 _messages references to use _meta
- Methods needing full payload (LoadAsync, ListAsync, etc.) call
  MaterializeMessage; metadata-only paths use _meta directly
- Fix MsgBlock.WriteAt to clear stale delete markers on re-write

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This commit is contained in:

Joseph Doherty

2026-03-13 15:33:38 -04:00

parent 7404ecdb0e

commit 6e91fda7fd

2 changed files with 365 additions and 237 deletions

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src/NATS.Server/JetStream/Storage/FileStore.cs

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