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This commit is contained in:
Chris Lu 2020-08-17 16:05:40 -07:00
parent 97e54a80d4
commit 0be4b6e7f0
1 changed files with 5 additions and 3 deletions
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8
weed/filer2/reader_at.go
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@ -70,6 +70,7 @@ func (c *ChunkReadAt) ReadAt(p []byte, offset int64) (n int, err error) {
c.readerLock.Lock()
defer c.readerLock.Unlock()
glog.V(4).Infof("ReadAt [%d,%d) of total file size %d bytes %d chunk views", offset, offset+int64(len(p)), c.fileSize, len(c.chunkViews))
for n < len(p) && err == nil {
readCount, readErr := c.doReadAt(p[n:], offset+int64(n))
n += readCount
@ -81,7 +82,7 @@ func (c *ChunkReadAt) ReadAt(p []byte, offset int64) (n int, err error) {
func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
var startOffset = offset
for _, chunk := range c.chunkViews {
for i, chunk := range c.chunkViews {
if startOffset < min(chunk.LogicOffset, int64(len(p))+offset) {
gap := int(min(chunk.LogicOffset, int64(len(p))+offset) - startOffset)
glog.V(4).Infof("zero [%d,%d)", n, n+gap)
@ -93,7 +94,7 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
if chunkStart >= chunkStop {
continue
}
glog.V(4).Infof("read [%d,%d), chunk %s [%d,%d)\n", chunkStart, chunkStop, chunk.FileId, chunk.LogicOffset-chunk.Offset, chunk.LogicOffset-chunk.Offset+int64(chunk.Size))
glog.V(4).Infof("read [%d,%d), %d chunk %s [%d,%d)", chunkStart, chunkStop, i, chunk.FileId, chunk.LogicOffset-chunk.Offset, chunk.LogicOffset-chunk.Offset+int64(chunk.Size))
c.buffer, err = c.fetchWholeChunkData(chunk)
if err != nil {
glog.Errorf("fetching chunk %+v: %v\n", chunk, err)
@ -124,12 +125,13 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
func (c *ChunkReadAt) fetchWholeChunkData(chunkView *ChunkView) (chunkData []byte, err error) {
glog.V(4).Infof("fetchWholeChunkData %s offset %d [%d,%d)\n", chunkView.FileId, chunkView.Offset, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
glog.V(4).Infof("fetchWholeChunkData %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(5).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)
if err != nil {
return