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mount: avoid duplicated reads

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This commit is contained in:
Chris Lu 2020-10-03 20:16:42 -07:00
parent 8d65ad1444
commit bc47835997
1 changed files with 44 additions and 23 deletions
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67
weed/filer/reader_at.go
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@ -4,6 +4,7 @@ import (
"context"
"fmt"
"io"
"math/rand"
"sync"
"github.com/chrislusf/seaweedfs/weed/glog"
@ -17,9 +18,12 @@ type ChunkReadAt struct {
chunkViews []*ChunkView
lookupFileId func(fileId string) (targetUrl string, err error)
readerLock sync.Mutex
fetcherLock sync.Mutex
fileSize int64
chunkCache chunk_cache.ChunkCache
lastChunkFileId string
lastChunkData []byte
chunkCache chunk_cache.ChunkCache
}
// var _ = io.ReaderAt(&ChunkReadAt{})
@ -27,28 +31,36 @@ type ChunkReadAt struct {
type LookupFileIdFunctionType func(fileId string) (targetUrl string, err error)
func LookupFn(filerClient filer_pb.FilerClient) LookupFileIdFunctionType {
vidCache := make(map[string]*filer_pb.Locations)
return func(fileId string) (targetUrl string, err error) {
err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
vid := VolumeId(fileId)
resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
VolumeIds: []string{vid},
vid := VolumeId(fileId)
locations, found := vidCache[vid]
if !found {
// println("looking up volume", vid)
err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
VolumeIds: []string{vid},
})
if err != nil {
return err
}
locations = resp.LocationsMap[vid]
if locations == nil || len(locations.Locations) == 0 {
glog.V(0).Infof("failed to locate %s", fileId)
return fmt.Errorf("failed to locate %s", fileId)
}
vidCache[vid] = locations
return nil
})
if err != nil {
return err
}
}
locations := resp.LocationsMap[vid]
if locations == nil || len(locations.Locations) == 0 {
glog.V(0).Infof("failed to locate %s", fileId)
return fmt.Errorf("failed to locate %s", fileId)
}
volumeServerAddress := filerClient.AdjustedUrl(locations.Locations[rand.Intn(len(locations.Locations))].Url)
targetUrl = fmt.Sprintf("http://%s/%s", volumeServerAddress, fileId)
volumeServerAddress := filerClient.AdjustedUrl(locations.Locations[0].Url)
targetUrl = fmt.Sprintf("http://%s/%s", volumeServerAddress, fileId)
return nil
})
return
}
}
@ -125,25 +137,34 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
func (c *ChunkReadAt) readFromWholeChunkData(chunkView *ChunkView) (chunkData []byte, err error) {
c.fetcherLock.Lock()
defer c.fetcherLock.Unlock()
if c.lastChunkFileId == chunkView.FileId {
return c.lastChunkData, nil
}
glog.V(4).Infof("readFromWholeChunkData %s offset %d [%d,%d) size at least %d", chunkView.FileId, chunkView.Offset, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size), chunkView.ChunkSize)
chunkData = c.chunkCache.GetChunk(chunkView.FileId, chunkView.ChunkSize)
if chunkData != nil {
glog.V(4).Infof("cache hit %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset-chunkView.Offset, chunkView.LogicOffset-chunkView.Offset+int64(len(chunkData)))
} else {
glog.V(4).Infof("doFetchFullChunkData %s", chunkView.FileId)
chunkData, err = c.doFetchFullChunkData(chunkView.FileId, chunkView.CipherKey, chunkView.IsGzipped)
chunkData, err = c.doFetchFullChunkData(chunkView)
if err != nil {
return
}
c.chunkCache.SetChunk(chunkView.FileId, chunkData)
c.lastChunkData = chunkData
c.lastChunkFileId = chunkView.FileId
}
return
}
func (c *ChunkReadAt) doFetchFullChunkData(fileId string, cipherKey []byte, isGzipped bool) ([]byte, error) {
func (c *ChunkReadAt) doFetchFullChunkData(chunkView *ChunkView) ([]byte, error) {
data, err := fetchChunk(c.lookupFileId, chunkView.FileId, chunkView.CipherKey, chunkView.IsGzipped)
return fetchChunk(c.lookupFileId, fileId, cipherKey, isGzipped)
return data, err
}