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better control for reader caching

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This commit is contained in:
chrislu
2022-02-26 02:16:47 -08:00
parent 3ad5fa6f6f
commit 28b395bef4
7 changed files with 240 additions and 250 deletions
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103
weed/util/chunk_cache/chunk_cache.go
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@@ -11,8 +11,6 @@ import (
var ErrorOutOfBounds = errors.New("attempt to read out of bounds")
type ChunkCache interface {
GetChunk(fileId string, minSize uint64) (data []byte)
GetChunkSlice(fileId string, offset, length uint64) []byte
ReadChunkAt(data []byte, fileId string, offset uint64) (n int, err error)
SetChunk(fileId string, data []byte)
}
@@ -45,107 +43,6 @@ func NewTieredChunkCache(maxEntries int64, dir string, diskSizeInUnit int64, uni
return c
}
func (c *TieredChunkCache) GetChunk(fileId string, minSize uint64) (data []byte) {
if c == nil {
return
}
c.RLock()
defer c.RUnlock()
return c.doGetChunk(fileId, minSize)
}
func (c *TieredChunkCache) doGetChunk(fileId string, minSize uint64) (data []byte) {
if minSize <= c.onDiskCacheSizeLimit0 {
data = c.memCache.GetChunk(fileId)
if len(data) >= int(minSize) {
return data
}
}
fid, err := needle.ParseFileIdFromString(fileId)
if err != nil {
glog.Errorf("failed to parse file id %s", fileId)
return nil
}
if minSize <= c.onDiskCacheSizeLimit0 {
data = c.diskCaches[0].getChunk(fid.Key)
if len(data) >= int(minSize) {
return data
}
}
if minSize <= c.onDiskCacheSizeLimit1 {
data = c.diskCaches[1].getChunk(fid.Key)
if len(data) >= int(minSize) {
return data
}
}
{
data = c.diskCaches[2].getChunk(fid.Key)
if len(data) >= int(minSize) {
return data
}
}
return nil
}
func (c *TieredChunkCache) GetChunkSlice(fileId string, offset, length uint64) []byte {
if c == nil {
return nil
}
c.RLock()
defer c.RUnlock()
return c.doGetChunkSlice(fileId, offset, length)
}
func (c *TieredChunkCache) doGetChunkSlice(fileId string, offset, length uint64) (data []byte) {
minSize := offset + length
if minSize <= c.onDiskCacheSizeLimit0 {
data, err := c.memCache.getChunkSlice(fileId, offset, length)
if err != nil {
glog.Errorf("failed to read from memcache: %s", err)
}
if len(data) >= int(minSize) {
return data
}
}
fid, err := needle.ParseFileIdFromString(fileId)
if err != nil {
glog.Errorf("failed to parse file id %s", fileId)
return nil
}
if minSize <= c.onDiskCacheSizeLimit0 {
data = c.diskCaches[0].getChunkSlice(fid.Key, offset, length)
if len(data) >= int(minSize) {
return data
}
}
if minSize <= c.onDiskCacheSizeLimit1 {
data = c.diskCaches[1].getChunkSlice(fid.Key, offset, length)
if len(data) >= int(minSize) {
return data
}
}
{
data = c.diskCaches[2].getChunkSlice(fid.Key, offset, length)
if len(data) >= int(minSize) {
return data
}
}
return nil
}
func (c *TieredChunkCache) ReadChunkAt(data []byte, fileId string, offset uint64) (n int, err error) {
if c == nil {
return 0, nil