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s3: route versioned PutObject finalize off the DLM (#9631)

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s3: route versioned PutObject finalize off the distributed lock

A versioned write's finalize (flip the .versions pointer to the newest version,
demote the prior latest) now runs as a single RECOMPUTE_LATEST ObjectTransaction
on the object's owner filer, under its per-path lock, instead of the unserialized
updateLatestVersionInDirectory. The version file is written first; the owner
re-derives the pointer by scanning the directory.

RECOMPUTE_LATEST gains size_to_key / mtime_to_key to cache the chosen version's
size and mtime on the pointer, and demote_key / demote_value to stamp the
displaced prior latest (NoncurrentSinceNs for lifecycle) when the pointer moves.

Falls back to updateLatestVersionInDirectory when no owner is known yet.
This commit is contained in:
Chris Lu
2026-05-24 03:10:30 -07:00
committed by GitHub
parent 32aa70ab59
commit db954b5503
8 changed files with 246 additions and 18 deletions
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other/java/client/src/main/proto/filer.proto
+4
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@@ -329,6 +329,10 @@ message Recompute {
bool descending = 2; // pick the child that sorts last by name (else first)
map<string, string> copy_extended = 3; // pointer extended key -> source extended key on the chosen child
string name_to_key = 4; // if set, store the chosen child's name under this pointer key
string size_to_key = 5; // if set, store the chosen child's FileSize (decimal) under this pointer key
string mtime_to_key = 6; // if set, store the chosen child's Mtime (decimal) under this pointer key
string demote_key = 7; // if set, stamp demote_value on the prior name_to_key target when it changes
bytes demote_value = 8; // value for demote_key
}
// ObjectTransactionRequest applies an ordered list of mutations atomically with