// LocateResource returns the location of the specified resource.
func LocateResource(zkquorum string, resource ResourceName) (string, uint16, error) {
zks := strings.Split(zkquorum, ",")
zkconn, _, err := zk.Connect(zks, time.Duration(sessionTimeout)*time.Second)
if err != nil {
return "", 0,
fmt.Errorf("Error connecting to ZooKeeper at %v: %s", zks, err)
}
defer zkconn.Close()
buf, _, err := zkconn.Get(string(resource))
if err != nil {
return "", 0,
fmt.Errorf("Failed to read the %s znode: %s", resource, err)
}
if len(buf) == 0 {
log.Fatalf("%s was empty!", resource)
} else if buf[0] != 0xFF {
return "", 0,
fmt.Errorf("The first byte of %s was 0x%x, not 0xFF", resource, buf[0])
}
metadataLen := binary.BigEndian.Uint32(buf[1:])
if metadataLen < 1 || metadataLen > 65000 {
return "", 0, fmt.Errorf("Invalid metadata length for %s: %d", resource, metadataLen)
}
buf = buf[1+4+metadataLen:]
magic := binary.BigEndian.Uint32(buf)
const pbufMagic = 1346524486 // 4 bytes: "PBUF"
if magic != pbufMagic {
return "", 0, fmt.Errorf("Invalid magic number for %s: %d", resource, magic)
}
buf = buf[4:]
var server *pb.ServerName
if resource == Meta {
meta := &pb.MetaRegionServer{}
err = proto.UnmarshalMerge(buf, meta)
if err != nil {
return "", 0,
fmt.Errorf("Failed to deserialize the MetaRegionServer entry from ZK: %s", err)
}
server = meta.Server
} else {
master := &pb.Master{}
err = proto.UnmarshalMerge(buf, master)
if err != nil {
return "", 0,
fmt.Errorf("Failed to deserialize the Master entry from ZK: %s", err)
}
server = master.Master
}
return *server.HostName, uint16(*server.Port), nil
}
// InfoFromCell parses a KeyValue from the meta table and creates the
// corresponding Info object.
func InfoFromCell(cell *pb.Cell) (*Info, error) {
value := cell.Value
if len(value) == 0 {
return nil, fmt.Errorf("empty value in %q", cell)
} else if value[0] != 'P' {
return nil, fmt.Errorf("unsupported region info version %d in %q",
value[0], cell)
}
const pbufMagic = 1346524486 // 4 bytes: "PBUF"
magic := binary.BigEndian.Uint32(value)
if magic != pbufMagic {
return nil, fmt.Errorf("invalid magic number in %q", cell)
}
regInfo := &pb.RegionInfo{}
err := proto.UnmarshalMerge(value[4:len(value)-4], regInfo)
if err != nil {
return nil, fmt.Errorf("failed to decode %q: %s", cell, err)
}
return &Info{
Table: regInfo.TableName.Qualifier,
RegionName: cell.Row,
StartKey: regInfo.StartKey,
StopKey: regInfo.EndKey,
availableLock: sync.Mutex{},
}, nil
}
// goroutine safe
func (p *Processor) Unmarshal(data []byte) (interface{}, error) {
if len(data) < 2 {
return nil, errors.New("protobuf data too short")
}
// id
var id uint16
if p.littleEndian {
id = binary.LittleEndian.Uint16(data)
} else {
id = binary.BigEndian.Uint16(data)
}
if id >= uint16(len(p.msgInfo)) {
return nil, fmt.Errorf("message id %v not registered", id)
}
// msg
i := p.msgInfo[id]
if i.msgRawHandler != nil {
return MsgRaw{id, data[2:]}, nil
} else {
msg := reflect.New(i.msgType.Elem()).Interface()
return msg, proto.UnmarshalMerge(data[2:], msg.(proto.Message))
}
}
func (lm *logManager) retrieveLog() (err error) {
files, err := ioutil.ReadDir(lm.logDir)
if err != nil {
return fmt.Errorf("could not retrieve old logs: %v", err)
}
for _, file := range files {
if !file.IsDir() {
var startLSN, endLSN = -1, -1
_, err = fmt.Sscanf(file.Name(), logFileFmt, &startLSN, &endLSN)
if err != nil {
continue
}
if startLSN != lm.nextLSN || endLSN < startLSN {
err = fmt.Errorf("log file %s was not in the expected format", file.Name())
break
}
filename := fmt.Sprintf("%s/%s", lm.logDir, file.Name())
data, err := ioutil.ReadFile(filename)
if err != nil {
err = fmt.Errorf("could not read log file %s: %v", filename, err)
break
}
if err = proto.UnmarshalMerge(data, &lm.log); err != nil {
err = fmt.Errorf("could not unmarshal log file %s: %v", filename, err)
break
}
lm.nextLSN = len(lm.log.Entry)
if nextLSN := endLSN + 1; nextLSN != lm.nextLSN {
err = fmt.Errorf("log file %s did not have the right number of entries", filename)
break
}
}
}
lm.nextLSNToFlush = lm.nextLSN
return err
}
func (c *Client) receiveRpcs() {
var sz [4]byte
for {
err := c.readFully(sz[:])
if err != nil {
c.setSendErr(err)
c.errorEncountered()
return
}
buf := make([]byte, binary.BigEndian.Uint32(sz[:]))
err = c.readFully(buf)
if err != nil {
c.setSendErr(err)
c.errorEncountered()
return
}
resp := &pb.ResponseHeader{}
respLen, nb := proto.DecodeVarint(buf)
buf = buf[nb:]
err = proto.UnmarshalMerge(buf[:respLen], resp)
buf = buf[respLen:]
if err != nil {
// Failed to deserialize the response header
c.setSendErr(err)
c.errorEncountered()
return
}
if resp.CallId == nil {
// Response doesn't have a call ID
log.Error("Response doesn't have a call ID!")
c.setSendErr(ErrMissingCallID)
c.errorEncountered()
return
}
c.sentRPCsMutex.Lock()
rpc, ok := c.sentRPCs[*resp.CallId]
c.sentRPCsMutex.Unlock()
if !ok {
log.WithFields(log.Fields{
"CallId": *resp.CallId,
}).Error("Received a response with an unexpected call ID")
log.Error("Waiting for responses to the following calls:")
c.sentRPCsMutex.Lock()
for id, call := range c.sentRPCs {
log.Errorf("\t\t%d: %v", id, call)
}
c.sentRPCsMutex.Unlock()
c.setSendErr(fmt.Errorf("HBase sent a response with an unexpected call ID: %d",
resp.CallId))
c.errorEncountered()
return
}
var rpcResp proto.Message
if resp.Exception == nil {
respLen, nb = proto.DecodeVarint(buf)
buf = buf[nb:]
rpcResp = rpc.NewResponse()
err = proto.UnmarshalMerge(buf, rpcResp)
buf = buf[respLen:]
} else {
javaClass := *resp.Exception.ExceptionClassName
err = fmt.Errorf("HBase Java exception %s: \n%s", javaClass,
*resp.Exception.StackTrace)
if _, ok := javaRetryableExceptions[javaClass]; ok {
// This is a recoverable error. The client should retry.
err = RetryableError{err}
}
}
rpc.GetResultChan() <- hrpc.RPCResult{Msg: rpcResp, Error: err}
c.sentRPCsMutex.Lock()
delete(c.sentRPCs, *resp.CallId)
c.sentRPCsMutex.Unlock()
}
}
