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FUSE mount: lazy loading meta cache

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This commit is contained in:
Chris Lu 2020-06-19 09:45:27 -07:00
parent c0283eee1a
commit f7a45d448f
4 changed files with 54 additions and 8 deletions
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9
weed/filesys/dir.go
View file

@ -8,6 +8,7 @@ import (
"time"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
@ -204,8 +205,10 @@ func (dir *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.
glog.V(4).Infof("dir Lookup %s: %s by %s", dir.FullPath(), req.Name, req.Header.String())
fullFilePath := util.NewFullPath(dir.FullPath(), req.Name)
dirPath := dir.FullPath()
fullFilePath := util.NewFullPath(dirPath, req.Name)
meta_cache.EnsureVisited(dir.wfs.metaCache, dir.wfs, util.FullPath(dirPath))
cachedEntry, cacheErr := dir.wfs.metaCache.FindEntry(context.Background(), fullFilePath)
if cacheErr == filer_pb.ErrNotFound {
return nil, fuse.ENOENT
@ -263,7 +266,9 @@ func (dir *Dir) ReadDirAll(ctx context.Context) (ret []fuse.Dirent, err error) {
return nil
}
listedEntries, listErr := dir.wfs.metaCache.ListDirectoryEntries(context.Background(), util.FullPath(dir.FullPath()), "", false, int(dir.wfs.option.DirListCacheLimit))
dirPath := util.FullPath(dir.FullPath())
meta_cache.EnsureVisited(dir.wfs.metaCache, dir.wfs, dirPath)
listedEntries, listErr := dir.wfs.metaCache.ListDirectoryEntries(context.Background(), dirPath, "", false, int(dir.wfs.option.DirListCacheLimit))
if listErr != nil {
glog.Errorf("list meta cache: %v", listErr)
return nil, fuse.EIO

13
weed/filesys/meta_cache/meta_cache.go
View file

@ -9,16 +9,19 @@ import (
"github.com/chrislusf/seaweedfs/weed/filer2/leveldb"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/util/bounded_tree"
)
type MetaCache struct {
actualStore filer2.FilerStore
sync.RWMutex
visitedBoundary *bounded_tree.BoundedTree
}
func NewMetaCache(dbFolder string) *MetaCache {
return &MetaCache{
actualStore: openMetaStore(dbFolder),
visitedBoundary: bounded_tree.NewBoundedTree(),
}
}
@ -49,16 +52,26 @@ func (mc *MetaCache) InsertEntry(ctx context.Context, entry *filer2.Entry) error
func (mc *MetaCache) AtomicUpdateEntry(ctx context.Context, oldPath util.FullPath, newEntry *filer2.Entry) error {
mc.Lock()
defer mc.Unlock()
oldDir, _ := oldPath.DirAndName()
if mc.visitedBoundary.HasVisited(util.FullPath(oldDir)) {
if oldPath != "" {
if err := mc.actualStore.DeleteEntry(ctx, oldPath); err != nil {
return err
}
}
}else{
// println("unknown old directory:", oldDir)
}
if newEntry != nil {
newDir, _ := newEntry.DirAndName()
if mc.visitedBoundary.HasVisited(util.FullPath(newDir)) {
if err := mc.actualStore.InsertEntry(ctx, newEntry); err != nil {
return err
}
}
}
return nil
}

26
weed/filesys/meta_cache/meta_cache_init.go
View file

@ -2,6 +2,7 @@ package meta_cache
import (
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/glog"
@ -10,6 +11,7 @@ import (
)
func InitMetaCache(mc *MetaCache, client filer_pb.FilerClient, path string) error {
return nil
glog.V(0).Infof("synchronizing meta data ...")
filer_pb.TraverseBfs(client, util.FullPath(path), func(parentPath util.FullPath, pbEntry *filer_pb.Entry) {
entry := filer2.FromPbEntry(string(parentPath), pbEntry)
@ -19,3 +21,27 @@ func InitMetaCache(mc *MetaCache, client filer_pb.FilerClient, path string) erro
})
return nil
}
func EnsureVisited(mc *MetaCache, client filer_pb.FilerClient, dirPath util.FullPath) {
mc.visitedBoundary.EnsureVisited(dirPath, func(path util.FullPath) (childDirectories []string, err error) {
glog.V(2).Infof("ReadDirAllEntries %s ...", path)
err = filer_pb.ReadDirAllEntries(client, dirPath, "", func(pbEntry *filer_pb.Entry, isLast bool) error {
entry := filer2.FromPbEntry(string(dirPath), pbEntry)
if err := mc.InsertEntry(context.Background(), entry); err != nil {
glog.V(0).Infof("read %s: %v", entry.FullPath, err)
return err
}
if entry.IsDirectory() {
childDirectories = append(childDirectories, entry.Name())
}
return nil
})
if err != nil {
err = fmt.Errorf("list %s: %v", dirPath, err)
}
return
})
}

2
weed/filesys/xattr.go
View file

@ -5,6 +5,7 @@ import (
"github.com/seaweedfs/fuse"
"github.com/chrislusf/seaweedfs/weed/filesys/meta_cache"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
)
@ -113,6 +114,7 @@ func (wfs *WFS) maybeLoadEntry(dir, name string) (entry *filer_pb.Entry, err err
// glog.V(3).Infof("read entry cache miss %s", fullpath)
// read from async meta cache
meta_cache.EnsureVisited(wfs.metaCache, wfs, util.FullPath(dir))
cachedEntry, cacheErr := wfs.metaCache.FindEntry(context.Background(), fullpath)
if cacheErr == filer_pb.ErrNotFound {
return nil, fuse.ENOENT