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🔍 BM25 (`RegionId.BM25`, ID: 22)¶

Binary snapshot of BM25 sparse lexical indexes for cold start

Overview¶

Property	Value
Bundle	`runtime.bundle`
Memory Shape	AppendMemory
Layout Class	Raw append stream
Store Class	N/A
Record Stride	0 bytes (variable-length)
Cache-Line Aligned	No

Wire Diagram (Variable Bytes)¶

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|             Serialized BM25 index snapshot blobs              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Field Specifications¶

This region uses a raw AppendMemory serialization format without a dedicated fixed layout class. It stores opaque serialized blobs of the BM25 index structures.

Access Patterns & Concurrency¶

Appended during checkpoints; read linearly during cold start initialization to reconstruct the BM25 lexical index in memory.

Cognitive Role¶

Provides persistent cold-start recovery for the BM25 sparse lexical indexes, bypassing the need to re-index all episodic and semantic texts on startup.

RegionPreamble