seaweedfs/weed/storage/volume_write.go

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package storage
import (
"bytes"
"errors"
"fmt"
"os"
"time"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
"github.com/seaweedfs/seaweedfs/weed/storage/needle"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
)
var ErrorNotFound = errors.New("not found")
var ErrorDeleted = errors.New("already deleted")
var ErrorSizeMismatch = errors.New("size mismatch")
func (v *Volume) checkReadWriteError(err error) {
if err == nil {
if v.lastIoError != nil {
v.lastIoError = nil
}
return
}
if err.Error() == "input/output error" {
v.lastIoError = err
}
}
// isFileUnchanged checks whether this needle to write is same as last one.
// It requires serialized access in the same volume.
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func (v *Volume) isFileUnchanged(n *needle.Needle) bool {
if v.Ttl.String() != "" {
return false
}
nv, ok := v.nm.Get(n.Id)
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if ok && !nv.Offset.IsZero() && nv.Size.IsValid() {
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oldNeedle := new(needle.Needle)
err := oldNeedle.ReadData(v.DataBackend, nv.Offset.ToActualOffset(), nv.Size, v.Version())
if err != nil {
glog.V(0).Infof("Failed to check updated file at offset %d size %d: %v", nv.Offset.ToActualOffset(), nv.Size, err)
return false
}
if oldNeedle.Cookie == n.Cookie && oldNeedle.Checksum == n.Checksum && bytes.Equal(oldNeedle.Data, n.Data) {
n.DataSize = oldNeedle.DataSize
return true
}
}
return false
}
// Destroy removes everything related to this volume
func (v *Volume) Destroy() (err error) {
if v.isCompacting || v.isCommitCompacting {
err = fmt.Errorf("volume %d is compacting", v.Id)
return
}
close(v.asyncRequestsChan)
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storageName, storageKey := v.RemoteStorageNameKey()
if v.HasRemoteFile() && storageName != "" && storageKey != "" {
if backendStorage, found := backend.BackendStorages[storageName]; found {
backendStorage.DeleteFile(storageKey)
}
}
v.Close()
removeVolumeFiles(v.DataFileName())
removeVolumeFiles(v.IndexFileName())
return
}
func removeVolumeFiles(filename string) {
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// basic
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os.Remove(filename + ".dat")
os.Remove(filename + ".idx")
os.Remove(filename + ".vif")
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// sorted index file
os.Remove(filename + ".sdx")
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// compaction
os.Remove(filename + ".cpd")
os.Remove(filename + ".cpx")
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// level db indx file
os.RemoveAll(filename + ".ldb")
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// marker for damaged or incomplete volume
os.Remove(filename + ".note")
}
func (v *Volume) asyncRequestAppend(request *needle.AsyncRequest) {
v.asyncRequestsChan <- request
}
func (v *Volume) syncWrite(n *needle.Needle, checkCookie bool) (offset uint64, size Size, isUnchanged bool, err error) {
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// glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
actualSize := needle.GetActualSize(Size(len(n.Data)), v.Version())
v.dataFileAccessLock.Lock()
defer v.dataFileAccessLock.Unlock()
if MaxPossibleVolumeSize < v.nm.ContentSize()+uint64(actualSize) {
err = fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.nm.ContentSize())
return
}
return v.doWriteRequest(n, checkCookie)
}
func (v *Volume) writeNeedle2(n *needle.Needle, checkCookie bool, fsync bool) (offset uint64, size Size, isUnchanged bool, err error) {
// glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
if n.Ttl == needle.EMPTY_TTL && v.Ttl != needle.EMPTY_TTL {
n.SetHasTtl()
n.Ttl = v.Ttl
}
if !fsync {
return v.syncWrite(n, checkCookie)
} else {
asyncRequest := needle.NewAsyncRequest(n, true)
// using len(n.Data) here instead of n.Size before n.Size is populated in n.Append()
asyncRequest.ActualSize = needle.GetActualSize(Size(len(n.Data)), v.Version())
v.asyncRequestAppend(asyncRequest)
offset, _, isUnchanged, err = asyncRequest.WaitComplete()
return
}
}
func (v *Volume) doWriteRequest(n *needle.Needle, checkCookie bool) (offset uint64, size Size, isUnchanged bool, err error) {
// glog.V(4).Infof("writing needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
if v.isFileUnchanged(n) {
size = Size(n.DataSize)
isUnchanged = true
return
}
// check whether existing needle cookie matches
nv, ok := v.nm.Get(n.Id)
if ok {
existingNeedle, _, _, existingNeedleReadErr := needle.ReadNeedleHeader(v.DataBackend, v.Version(), nv.Offset.ToActualOffset())
if existingNeedleReadErr != nil {
err = fmt.Errorf("reading existing needle: %v", existingNeedleReadErr)
return
}
if n.Cookie == 0 && !checkCookie {
// this is from batch deletion, and read back again when tailing a remote volume
// which only happens when checkCookie == false and fsync == false
n.Cookie = existingNeedle.Cookie
}
if existingNeedle.Cookie != n.Cookie {
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glog.V(0).Infof("write cookie mismatch: existing %s, new %s",
needle.NewFileIdFromNeedle(v.Id, existingNeedle), needle.NewFileIdFromNeedle(v.Id, n))
err = fmt.Errorf("mismatching cookie %x", n.Cookie)
return
}
}
// append to dat file
n.AppendAtNs = uint64(time.Now().UnixNano())
offset, size, _, err = n.Append(v.DataBackend, v.Version())
v.checkReadWriteError(err)
if err != nil {
return
}
v.lastAppendAtNs = n.AppendAtNs
// add to needle map
if !ok || uint64(nv.Offset.ToActualOffset()) < offset {
if err = v.nm.Put(n.Id, ToOffset(int64(offset)), n.Size); err != nil {
glog.V(4).Infof("failed to save in needle map %d: %v", n.Id, err)
}
}
if v.lastModifiedTsSeconds < n.LastModified {
v.lastModifiedTsSeconds = n.LastModified
}
return
}
func (v *Volume) syncDelete(n *needle.Needle) (Size, error) {
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// glog.V(4).Infof("delete needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
actualSize := needle.GetActualSize(0, v.Version())
v.dataFileAccessLock.Lock()
defer v.dataFileAccessLock.Unlock()
if MaxPossibleVolumeSize < v.nm.ContentSize()+uint64(actualSize) {
err := fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.nm.ContentSize())
return 0, err
}
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return v.doDeleteRequest(n)
}
func (v *Volume) deleteNeedle2(n *needle.Needle) (Size, error) {
// todo: delete info is always appended no fsync, it may need fsync in future
fsync := false
if !fsync {
return v.syncDelete(n)
} else {
asyncRequest := needle.NewAsyncRequest(n, false)
asyncRequest.ActualSize = needle.GetActualSize(0, v.Version())
v.asyncRequestAppend(asyncRequest)
_, size, _, err := asyncRequest.WaitComplete()
return Size(size), err
}
}
func (v *Volume) doDeleteRequest(n *needle.Needle) (Size, error) {
glog.V(4).Infof("delete needle %s", needle.NewFileIdFromNeedle(v.Id, n).String())
nv, ok := v.nm.Get(n.Id)
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// fmt.Println("key", n.Id, "volume offset", nv.Offset, "data_size", n.Size, "cached size", nv.Size)
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if ok && nv.Size.IsValid() {
size := nv.Size
n.Data = nil
n.AppendAtNs = uint64(time.Now().UnixNano())
offset, _, _, err := n.Append(v.DataBackend, v.Version())
v.checkReadWriteError(err)
if err != nil {
return size, err
}
v.lastAppendAtNs = n.AppendAtNs
if err = v.nm.Delete(n.Id, ToOffset(int64(offset))); err != nil {
return size, err
}
return size, err
}
return 0, nil
}
func (v *Volume) startWorker() {
go func() {
chanClosed := false
for {
// chan closed. go thread will exit
if chanClosed {
break
}
currentRequests := make([]*needle.AsyncRequest, 0, 128)
currentBytesToWrite := int64(0)
for {
request, ok := <-v.asyncRequestsChan
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// volume may be closed
if !ok {
chanClosed = true
break
}
if MaxPossibleVolumeSize < v.ContentSize()+uint64(currentBytesToWrite+request.ActualSize) {
request.Complete(0, 0, false,
fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.ContentSize()))
break
}
currentRequests = append(currentRequests, request)
currentBytesToWrite += request.ActualSize
// submit at most 4M bytes or 128 requests at one time to decrease request delay.
// it also need to break if there is no data in channel to avoid io hang.
if currentBytesToWrite >= 4*1024*1024 || len(currentRequests) >= 128 || len(v.asyncRequestsChan) == 0 {
break
}
}
if len(currentRequests) == 0 {
continue
}
v.dataFileAccessLock.Lock()
end, _, e := v.DataBackend.GetStat()
if e != nil {
for i := 0; i < len(currentRequests); i++ {
currentRequests[i].Complete(0, 0, false,
fmt.Errorf("cannot read current volume position: %v", e))
}
v.dataFileAccessLock.Unlock()
continue
}
for i := 0; i < len(currentRequests); i++ {
if currentRequests[i].IsWriteRequest {
offset, size, isUnchanged, err := v.doWriteRequest(currentRequests[i].N, true)
currentRequests[i].UpdateResult(offset, uint64(size), isUnchanged, err)
} else {
size, err := v.doDeleteRequest(currentRequests[i].N)
currentRequests[i].UpdateResult(0, uint64(size), false, err)
}
}
// if sync error, data is not reliable, we should mark the completed request as fail and rollback
if err := v.DataBackend.Sync(); err != nil {
// todo: this may generate dirty data or cause data inconsistent, may be weed need to panic?
if te := v.DataBackend.Truncate(end); te != nil {
glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", v.DataBackend.Name(), end, te)
}
for i := 0; i < len(currentRequests); i++ {
if currentRequests[i].IsSucceed() {
currentRequests[i].UpdateResult(0, 0, false, err)
}
}
}
for i := 0; i < len(currentRequests); i++ {
currentRequests[i].Submit()
}
v.dataFileAccessLock.Unlock()
}
}()
}
func (v *Volume) WriteNeedleBlob(needleId NeedleId, needleBlob []byte, size Size) error {
v.dataFileAccessLock.Lock()
defer v.dataFileAccessLock.Unlock()
if MaxPossibleVolumeSize < v.nm.ContentSize()+uint64(len(needleBlob)) {
return fmt.Errorf("volume size limit %d exceeded! current size is %d", MaxPossibleVolumeSize, v.nm.ContentSize())
}
appendAtNs := uint64(time.Now().UnixNano())
offset, err := needle.WriteNeedleBlob(v.DataBackend, needleBlob, size, appendAtNs, v.Version())
v.checkReadWriteError(err)
if err != nil {
return err
}
v.lastAppendAtNs = appendAtNs
// add to needle map
if err = v.nm.Put(needleId, ToOffset(int64(offset)), size); err != nil {
glog.V(4).Infof("failed to put in needle map %d: %v", needleId, err)
}
return err
}