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ListObjects Metadata Caching (#10648)

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Design: https://gist.github.com/klauspost/025c09b48ed4a1293c917cecfabdf21c

Gist of improvements:

* Cross-server caching and listing will use the same data across servers and requests.
* Lists can be arbitrarily resumed at a constant speed.
* Metadata for all files scanned is stored for streaming retrieval.
* The existing bloom filters controlled by the crawler is used for validating caches.
* Concurrent requests for the same data (or parts of it) will not spawn additional walkers.
* Listing a subdirectory of an existing recursive cache will use the cache.
* All listing operations are fully streamable so the number of objects in a bucket no 
  longer dictates the amount of memory.
* Listings can be handled by any server within the cluster.
* Caches are cleaned up when out of date or superseded by a more recent one.
This commit is contained in:
Klaus Post
2020-10-28 09:18:35 -07:00
committed by GitHub
parent 51222cc664
commit a982baff27
65 changed files with 6328 additions and 742 deletions
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5
cmd/storage-interface.go
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@@ -48,6 +48,9 @@ type StorageAPI interface {
StatVol(ctx context.Context, volume string) (vol VolInfo, err error)
DeleteVol(ctx context.Context, volume string, forceDelete bool) (err error)
// WalkDir will walk a directory on disk and return a metacache stream on wr.
WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writer) error
// WalkVersions in sorted order directly on disk.
WalkVersions(ctx context.Context, volume, dirPath, marker string, recursive bool, endWalkCh <-chan struct{}) (chan FileInfoVersions, error)
// Walk in sorted order directly on disk.
@@ -71,7 +74,7 @@ type StorageAPI interface {
RenameFile(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string) error
CheckParts(ctx context.Context, volume string, path string, fi FileInfo) error
CheckFile(ctx context.Context, volume string, path string) (err error)
DeleteFile(ctx context.Context, volume string, path string) (err error)
Delete(ctx context.Context, volume string, path string, recursive bool) (err error)
VerifyFile(ctx context.Context, volume, path string, fi FileInfo) error
// Write all data, syncs the data to disk.