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C2a fix: a flattened record is marked by the document it stores; every writer decides its header by content

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A flattened variant's HoldsIds is read off the document re-resolved against the post-batch base, not carried from the
variant or from the document the flatten was planned against. The conditional commit onto a file decides by the same
rule as the unconditional commit (ids in the records the file will hold, ids only this cache minted excepted, a marked
file staying marked). The directory manifest's header choice moves beside FormatFor. Pins the three-batch flatten
probe on the commit and flush paths, the conditional commit, the last id leaving, an id-bearing override that is not
the last, and a failed CultMesh write giving its ids back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Meta Vens 2026-09-29 21:20:01 +02:00
commit 6a7d17bdda
5 changed files with 153 additions and 10 deletions
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8
src/GameCult.Caching.MessagePack/DirectoryMessagePackBackingStore.cs
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@ -15,10 +15,8 @@ namespace GameCult.Caching.MessagePack;
// A small hot manifest indexes the store; each record lives in one cold content-addressed page.
public sealed class DirectoryMessagePackBackingStore : CacheBackingStore
{
private const string IndexedFormatVersion = "cultcache.store.v4.directory-content-addressed-pages";
// The manifest of a directory that holds element ids: a reader older than ids refuses it, because it would skip the id
// slots of a page and rewrite the elements without them.
private const string IndexedFormatVersionWithIds = "cultcache.store.v5.directory-content-addressed-pages";
private const string IndexedFormatVersion = CultPersistedStoreSnapshot.DirectoryFormatV4;
private const string IndexedFormatVersionWithIds = CultPersistedStoreSnapshot.DirectoryFormatV5;
// An unleased load that has not settled after this many attempts throws.
private const int UnleasedLoadAttempts = 5;
private readonly FileInfo _manifestFile;
@ -305,7 +303,7 @@ public sealed class DirectoryMessagePackBackingStore : CacheBackingStore
{
var manifest = new CultPersistedStoreSnapshot
{
FormatVersion = carriesElementIds ? IndexedFormatVersionWithIds : IndexedFormatVersion,
FormatVersion = CultPersistedStoreSnapshot.DirectoryFormatFor(carriesElementIds),
SchemaCatalog = catalog,
Records = index
};