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refactoring, same logic, but the store replication logic is moved to a

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stand-alone file, for later easier improvements
This commit is contained in:
Chris Lu 2013-04-16 00:10:21 -07:00
parent e4da140d0a
commit 915b16f97a
6 changed files with 108 additions and 89 deletions
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95
go/replication/store_replicate.go Normal file
View file

@ -0,0 +1,95 @@
package replication
import (
"bytes"
"code.google.com/p/weed-fs/go/operation"
"code.google.com/p/weed-fs/go/storage"
"log"
"net/http"
"strconv"
)
func ReplicatedWrite(masterNode string, s *storage.Store, volumeId storage.VolumeId, needle *storage.Needle, r *http.Request) (size uint32, errorStatus string) {
ret, err := s.Write(volumeId, needle)
needToReplicate := !s.HasVolume(volumeId)
if err != nil {
errorStatus = "Failed to write to local disk (" + err.Error() + ")"
} else if ret > 0 {
needToReplicate = needToReplicate || s.GetVolume(volumeId).NeedToReplicate()
} else {
errorStatus = "Failed to write to local disk"
}
if !needToReplicate && ret > 0 {
needToReplicate = s.GetVolume(volumeId).NeedToReplicate()
}
if needToReplicate { //send to other replica locations
if r.FormValue("type") != "standard" {
if !distributedOperation(masterNode, s, volumeId, func(location operation.Location) bool {
_, err := operation.Upload("http://"+location.Url+r.URL.Path+"?type=standard", string(needle.Name), bytes.NewReader(needle.Data))
return err == nil
}) {
ret = 0
errorStatus = "Failed to write to replicas for volume " + volumeId.String()
}
}
}
if errorStatus != "" {
if _, err = s.Delete(volumeId, needle); err != nil {
errorStatus += "\nCannot delete " + strconv.FormatUint(needle.Id, 10) + " from " +
strconv.FormatUint(uint64(volumeId), 10) + ": " + err.Error()
} else {
distributedOperation(masterNode, s, volumeId, func(location operation.Location) bool {
return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
})
}
}
size = ret
return
}
func ReplicatedDelete(masterNode string, store *storage.Store, volumeId storage.VolumeId, n *storage.Needle, r *http.Request) (ret uint32) {
ret, err := store.Delete(volumeId, n)
if err != nil {
log.Println("delete error:", err)
return
}
needToReplicate := !store.HasVolume(volumeId)
if !needToReplicate && ret > 0 {
needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
}
if needToReplicate { //send to other replica locations
if r.FormValue("type") != "standard" {
if !distributedOperation(masterNode, store, volumeId, func(location operation.Location) bool {
return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
}) {
ret = 0
}
}
}
return
}
func distributedOperation(masterNode string, store *storage.Store, volumeId storage.VolumeId, op func(location operation.Location) bool) bool {
if lookupResult, lookupErr := operation.Lookup(masterNode, volumeId); lookupErr == nil {
length := 0
selfUrl := (store.Ip + ":" + strconv.Itoa(store.Port))
results := make(chan bool)
for _, location := range lookupResult.Locations {
if location.Url != selfUrl {
length++
go func(location operation.Location, results chan bool) {
results <- op(location)
}(location, results)
}
}
ret := true
for i := 0; i < length; i++ {
ret = ret && <-results
}
return ret
} else {
log.Println("Failed to lookup for", volumeId, lookupErr.Error())
}
return false
}

11
go/directory/file_id.go → go/storage/file_id.go
View file

@ -1,19 +1,18 @@
package directory
package storage
import (
"code.google.com/p/weed-fs/go/storage"
"code.google.com/p/weed-fs/go/util"
"encoding/hex"
"strings"
)
type FileId struct {
VolumeId storage.VolumeId
VolumeId VolumeId
Key uint64
Hashcode uint32
}
func NewFileId(VolumeId storage.VolumeId, Key uint64, Hashcode uint32) *FileId {
func NewFileId(VolumeId VolumeId, Key uint64, Hashcode uint32) *FileId {
return &FileId{VolumeId: VolumeId, Key: Key, Hashcode: Hashcode}
}
func ParseFileId(fid string) *FileId {
@ -23,8 +22,8 @@ func ParseFileId(fid string) *FileId {
return nil
}
vid_string, key_hash_string := a[0], a[1]
volumeId, _ := storage.NewVolumeId(vid_string)
key, hash := storage.ParseKeyHash(key_hash_string)
volumeId, _ := NewVolumeId(vid_string)
key, hash := ParseKeyHash(key_hash_string)
return &FileId{VolumeId: volumeId, Key: key, Hashcode: hash}
}
func (n *FileId) String() string {

4
go/storage/needle.go
View file

@ -36,7 +36,7 @@ type Needle struct {
Padding []byte `comment:"Aligned to 8 bytes"`
}
func NewNeedle(r *http.Request) (n *Needle, fname string, e error) {
func NewNeedle(r *http.Request) (n *Needle, e error) {
n = new(Needle)
form, fe := r.MultipartReader()
@ -51,7 +51,7 @@ func NewNeedle(r *http.Request) (n *Needle, fname string, e error) {
e = fe
return
}
fname = part.FileName()
fname := part.FileName()
if fname != "" {
fname = path.Base(part.FileName())
} else {

3
go/topology/topology.go
View file

@ -1,7 +1,6 @@
package topology
import (
"code.google.com/p/weed-fs/go/directory"
"code.google.com/p/weed-fs/go/sequence"
"code.google.com/p/weed-fs/go/storage"
"errors"
@ -109,7 +108,7 @@ func (t *Topology) PickForWrite(repType storage.ReplicationType, count int) (str
return "", 0, nil, errors.New("No writable volumes avalable!")
}
fileId, count := t.sequence.NextFileId(count)
return directory.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
return storage.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
}
func (t *Topology) GetVolumeLayout(repType storage.ReplicationType) *VolumeLayout {

3
go/weed/export.go
View file

@ -3,7 +3,6 @@ package main
import (
"archive/tar"
"bytes"
"code.google.com/p/weed-fs/go/directory"
"code.google.com/p/weed-fs/go/storage"
"fmt"
"log"
@ -127,7 +126,7 @@ type nameParams struct {
}
func walker(vid storage.VolumeId, n *storage.Needle, version storage.Version) (err error) {
key := directory.NewFileId(vid, n.Id, n.Cookie).String()
key := storage.NewFileId(vid, n.Id, n.Cookie).String()
if tarFh != nil {
fnTmplBuf.Reset()
if err = fnTmpl.Execute(fnTmplBuf,

81
go/weed/volume.go
View file

@ -1,8 +1,8 @@
package main
import (
"bytes"
"code.google.com/p/weed-fs/go/operation"
"code.google.com/p/weed-fs/go/replication"
"code.google.com/p/weed-fs/go/storage"
"log"
"math/rand"
@ -187,46 +187,15 @@ func PostHandler(w http.ResponseWriter, r *http.Request) {
if e != nil {
writeJsonQuiet(w, r, e)
} else {
needle, filename, ne := storage.NewNeedle(r)
needle, ne := storage.NewNeedle(r)
if ne != nil {
writeJsonQuiet(w, r, ne)
} else {
ret, err := store.Write(volumeId, needle)
errorStatus := ""
needToReplicate := !store.HasVolume(volumeId)
if err != nil {
errorStatus = "Failed to write to local disk (" + err.Error() + ")"
} else if ret > 0 {
needToReplicate = needToReplicate || store.GetVolume(volumeId).NeedToReplicate()
} else {
errorStatus = "Failed to write to local disk"
}
if !needToReplicate && ret > 0 {
needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
}
if needToReplicate { //send to other replica locations
if r.FormValue("type") != "standard" {
if !distributedOperation(volumeId, func(location operation.Location) bool {
_, err := operation.Upload("http://"+location.Url+r.URL.Path+"?type=standard", filename, bytes.NewReader(needle.Data))
return err == nil
}) {
ret = 0
errorStatus = "Failed to write to replicas for volume " + volumeId.String()
}
}
}
ret, errorStatus := replication.ReplicatedWrite(*masterNode, store, volumeId, needle, r)
m := make(map[string]interface{})
if errorStatus == "" {
w.WriteHeader(http.StatusCreated)
} else {
if _, e = store.Delete(volumeId, needle); e != nil {
errorStatus += "\nCannot delete " + strconv.FormatUint(needle.Id, 10) + " from " +
strconv.FormatUint(uint64(volumeId), 10) + ": " + e.Error()
} else {
distributedOperation(volumeId, func(location operation.Location) bool {
return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
})
}
w.WriteHeader(http.StatusInternalServerError)
m["error"] = errorStatus
}
@ -259,25 +228,7 @@ func DeleteHandler(w http.ResponseWriter, r *http.Request) {
}
n.Size = 0
ret, err := store.Delete(volumeId, n)
if err != nil {
log.Println("delete error:", err)
return
}
needToReplicate := !store.HasVolume(volumeId)
if !needToReplicate && ret > 0 {
needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
}
if needToReplicate { //send to other replica locations
if r.FormValue("type") != "standard" {
if !distributedOperation(volumeId, func(location operation.Location) bool {
return nil == operation.Delete("http://"+location.Url+r.URL.Path+"?type=standard")
}) {
ret = 0
}
}
}
ret := replication.ReplicatedDelete(*masterNode, store, volumeId, n, r)
if ret != 0 {
w.WriteHeader(http.StatusAccepted)
@ -311,30 +262,6 @@ func parseURLPath(path string) (vid, fid, ext string) {
return
}
func distributedOperation(volumeId storage.VolumeId, op func(location operation.Location) bool) bool {
if lookupResult, lookupErr := operation.Lookup(*masterNode, volumeId); lookupErr == nil {
length := 0
selfUrl := (*ip + ":" + strconv.Itoa(*vport))
results := make(chan bool)
for _, location := range lookupResult.Locations {
if location.Url != selfUrl {
length++
go func(location operation.Location, results chan bool) {
results <- op(location)
}(location, results)
}
}
ret := true
for i := 0; i < length; i++ {
ret = ret && <-results
}
return ret
} else {
log.Println("Failed to lookup for", volumeId, lookupErr.Error())
}
return false
}
func runVolume(cmd *Command, args []string) bool {
if *vMaxCpu < 1 {
*vMaxCpu = runtime.NumCPU()