Without using StopGetStore, get hits on the in-flight cache would propagate as puts to subsequent nodes in the hierarchy. Since the in-flight cache is only used as temporary storage while a put is in flight, this caused duplicates of the in-flight puts, which manifests as move collision log spam from the file system cache store.
#preflight 625d772d691f49969ea93249
#rb Zousar.Shaker
#rnx
[CL 19785647 by Devin Doucette in ue5-main branch]
- FileSystem, Http, Pak, S3 use the ValueWithLegacyFallback mode by default, which cause them to fall back to searching for uncompressed data if compressed data is not found.
- FileSystem has been fixed to store up to 1 MiB of compressed data inline with the value package rather than separately in content-addressable storage.
- Pak has been optimized to have GetChunks only load the required region of the requested value, rather than the whole value.
- Pak has been changed to stop storing data inline in the record package, since it will end up in the same file anyway when stored separately.
- Pak will upgrade the compressor and compression level when a compressed pak file is requested. Default cache compression uses Oodle Mermaid VeryFast and will upgrade to Oodle Kraken Optimal2.
- Zen does not have compression enabled by default, pending deployment of a new version that stores compressed values to Horde Storage.
- Added a missing request barrier when saving uncompressed data as compressed.
Example reduction in file system cache size when cooking for Windows:
- CitySample dropped from 66.5 GiB to 21.8 GiB.
- Lyra dropped from 2.54 GiB to 672 MiB.
- ShooterGame dropped from 1.21 GiB to 380 MiB.
Example reduction in compressed pak file cache size when cooking for Windows:
- CitySample dropped from 22.3 GiB to 18.5 GiB.
- Lyra dropped from 691 MiB to 543 MiB.
- ShooterGame dropped from 387 MiB to 313 MiB.
#jira UE-134381
#preflight 620a703f583261b0a658e043, 620a6fb2803d9066e6805310, 620a733117632e948459b6af
#lockdown Aurel.Cordonnier
#rb Zousar.Shaker
#ROBOMERGE-AUTHOR: devin.doucette
#ROBOMERGE-SOURCE: CL 18983671 in //UE5/Release-5.0/... via CL 18983890 via CL 18984096
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v917-18934589)
[CL 18984126 by devin doucette in ue5-main branch]
This new cache hierarchy does not require the cache stores within it to complete every operation synchronously. When the child cache stores start to do async I/O, this hierarchy will support that instead of blocking like the existing hierarchy does.
This is a snapshot of the work in progress that is only implemented for the functions in ILegacyCacheStore.
#rb Zousar.Shaker
#rnx
#preflight 61f37e487a7f0d39ddd2d38b
#ROBOMERGE-AUTHOR: devin.doucette
#ROBOMERGE-SOURCE: CL 18768547 in //UE5/Release-5.0/... via CL 18768556 via CL 18768581
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v903-18687472)
[CL 18768594 by devin doucette in ue5-main branch]
