Another refactor to simply and likely speed up code. New code allows checkpoint and readline messages to be interleaved.
This commit is contained in:
Xavi Ramirez
parent
1bff01ff4f
commit
4809cdb4e6
1 changed files with 78 additions and 105 deletions
167
kcl/kcl.go
167
kcl/kcl.go
|
|
@ -21,22 +21,12 @@ type Checkpointer interface {
|
|||
Shutdown()
|
||||
}
|
||||
|
||||
type CheckpointError struct {
|
||||
e string
|
||||
}
|
||||
|
||||
func (ce CheckpointError) Error() string {
|
||||
return ce.e
|
||||
}
|
||||
|
||||
type ioHandler struct {
|
||||
inputFile io.Reader
|
||||
outputFile io.Writer
|
||||
errorFile io.Writer
|
||||
}
|
||||
|
||||
//func newIOHandler(inputFile io.Reader, outputFile io.Writer, errorFile io.)
|
||||
|
||||
func (i ioHandler) writeLine(line string) {
|
||||
fmt.Fprintf(i.outputFile, "\n%s\n", line)
|
||||
}
|
||||
|
|
@ -163,39 +153,6 @@ type KCLProcess struct {
|
|||
nextCheckpointPair SequencePair
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) reportDone(responseFor string) error {
|
||||
fmt.Println("%%%%%%%%%% %%%%%%%%%% %%%%%%%%%% Writing report done line")
|
||||
return kclp.ioHandler.writeAction(struct {
|
||||
Action string `json:"action"`
|
||||
ResponseFor string `json:"responseFor"`
|
||||
}{
|
||||
Action: "status",
|
||||
ResponseFor: responseFor,
|
||||
})
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) performAction(a interface{}) (string, error) {
|
||||
switch action := a.(type) {
|
||||
case ActionInitialize:
|
||||
return action.Action, kclp.recordProcessor.Initialize(action.ShardID, kclp)
|
||||
case ActionProcessRecords:
|
||||
return action.Action, kclp.recordProcessor.ProcessRecords(action.Records)
|
||||
case ActionShutdown:
|
||||
return action.Action, kclp.recordProcessor.Shutdown(action.Reason)
|
||||
default:
|
||||
return "", fmt.Errorf("unknown action to dispatch: %+#v", action)
|
||||
}
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) handleLine(line string) (string, error) {
|
||||
action, err := kclp.ioHandler.loadAction(line)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return kclp.performAction(action)
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) Checkpoint(pair SequencePair) {
|
||||
kclp.ckpmux.Lock()
|
||||
defer kclp.ckpmux.Unlock()
|
||||
|
|
@ -209,78 +166,94 @@ func (kclp *KCLProcess) Shutdown() {
|
|||
kclp.isShuttingDown = true
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) sendCheckpoint(pair SequencePair, retryCount int) error {
|
||||
sleepDuration := 5 * time.Second
|
||||
|
||||
for n := 0; n <= retryCount; n++ {
|
||||
fmt.Printf("Trying to checkpoint %d\n", n)
|
||||
err := kclp.processCheckpoint(pair)
|
||||
if err == nil {
|
||||
func (kclp *KCLProcess) handleCheckpointAction(action ActionCheckpoint) error {
|
||||
if action.Error == nil { // Successful checkpoint
|
||||
return nil
|
||||
}
|
||||
|
||||
if cperr, ok := err.(CheckpointError); ok {
|
||||
switch cperr.Error() {
|
||||
msg := *action.Error
|
||||
switch msg {
|
||||
case "ShutdownException":
|
||||
return fmt.Errorf("Encountered shutdown exception, skipping checkpoint")
|
||||
case "ThrottlingException":
|
||||
fmt.Fprintf(os.Stderr, "Checkpointing throttling, pause for %s\n", sleepDuration)
|
||||
sleep := 5 * time.Second
|
||||
fmt.Fprintf(os.Stderr, "Checkpointing throttling, pause for %s", sleep)
|
||||
time.Sleep(sleep)
|
||||
case "InvalidStateException":
|
||||
fmt.Fprintf(os.Stderr, "MultiLangDaemon invalid state while checkpointing\n")
|
||||
fmt.Fprintf(os.Stderr, "MultiLangDaemon invalid state while checkpointing")
|
||||
default:
|
||||
fmt.Fprintf(os.Stderr, "Encountered an error while checkpointing: %s", err)
|
||||
}
|
||||
} else {
|
||||
return err
|
||||
fmt.Fprintf(os.Stderr, "Encountered an error while checkpointing: %s", msg)
|
||||
}
|
||||
|
||||
if n == retryCount {
|
||||
return fmt.Errorf("Failed to checkpoint after %d attempts, giving up.", retryCount)
|
||||
}
|
||||
seq := action.SequenceNumber
|
||||
subSeq := action.SubSequenceNumber
|
||||
|
||||
time.Sleep(sleepDuration)
|
||||
kclp.ckpmux.Lock()
|
||||
if !kclp.nextCheckpointPair.IsEmpty() {
|
||||
tmp := kclp.nextCheckpointPair.Sequence.String()
|
||||
seq = &tmp
|
||||
subSeq = &kclp.nextCheckpointPair.SubSequence
|
||||
}
|
||||
kclp.ckpmux.Unlock()
|
||||
|
||||
if seq != nil && subSeq != nil {
|
||||
return kclp.sendCheckpoint(seq, subSeq)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) processCheckpoint(pair SequencePair) error {
|
||||
var seq *string
|
||||
var subSeq *int
|
||||
if !pair.IsEmpty() { // an empty pair is a signal to shutdown
|
||||
tmp := pair.Sequence.String()
|
||||
seq = &tmp
|
||||
subSeq = &pair.SubSequence
|
||||
}
|
||||
fmt.Println("%%%%%%%%%% %%%%%%%%%% %%%%%%%%%% Writing checkpoint")
|
||||
kclp.ioHandler.writeAction(ActionCheckpoint{
|
||||
func (kclp *KCLProcess) sendCheckpoint(seq *string, subSeq *int) error {
|
||||
return kclp.ioHandler.writeAction(ActionCheckpoint{
|
||||
Action: "checkpoint",
|
||||
SequenceNumber: seq,
|
||||
SubSequenceNumber: subSeq,
|
||||
})
|
||||
fmt.Println("%%%%%%%%%% %%%%%%%%%% %%%%%%%%%% Reading checkpoint line")
|
||||
line, err := kclp.ioHandler.readLine()
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) reportDone(responseFor string) error {
|
||||
return kclp.ioHandler.writeAction(struct {
|
||||
Action string `json:"action"`
|
||||
ResponseFor string `json:"responseFor"`
|
||||
}{
|
||||
Action: "status",
|
||||
ResponseFor: responseFor,
|
||||
})
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) handleLine(line string) error {
|
||||
action, err := kclp.ioHandler.loadAction(line)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
actionI, err := kclp.ioHandler.loadAction(line)
|
||||
if err != nil {
|
||||
|
||||
switch action := action.(type) {
|
||||
case ActionCheckpoint:
|
||||
err = kclp.handleCheckpointAction(action)
|
||||
case ActionInitialize:
|
||||
err = kclp.recordProcessor.Initialize(action.ShardID, kclp)
|
||||
if err == nil {
|
||||
err = kclp.reportDone(action.Action)
|
||||
}
|
||||
case ActionProcessRecords:
|
||||
err = kclp.recordProcessor.ProcessRecords(action.Records)
|
||||
if err == nil {
|
||||
err = kclp.reportDone(action.Action)
|
||||
}
|
||||
case ActionShutdown:
|
||||
err = kclp.recordProcessor.Shutdown(action.Reason)
|
||||
if err == nil {
|
||||
err = kclp.reportDone(action.Action)
|
||||
}
|
||||
default:
|
||||
err = fmt.Errorf("unknown action to dispatch: %+#v", action)
|
||||
}
|
||||
|
||||
return err
|
||||
}
|
||||
action, ok := actionI.(ActionCheckpoint)
|
||||
if !ok {
|
||||
return fmt.Errorf("expected checkpoint response, got '%s'", line)
|
||||
}
|
||||
if action.Error != nil && *action.Error != "" {
|
||||
return CheckpointError{e: *action.Error}
|
||||
}
|
||||
fmt.Println("Successful checkpoint")
|
||||
return nil
|
||||
}
|
||||
|
||||
func (kclp *KCLProcess) Run() {
|
||||
for {
|
||||
fmt.Println("%%%%%%%%%% %%%%%%%%%% %%%%%%%%%% Reading process line")
|
||||
line, err := kclp.ioHandler.readLine()
|
||||
if err == io.EOF {
|
||||
kclp.ioHandler.writeError("IO stream closed")
|
||||
|
|
@ -290,31 +263,31 @@ func (kclp *KCLProcess) Run() {
|
|||
return
|
||||
} else if line == "" {
|
||||
kclp.ioHandler.writeError("Empty read line recieved")
|
||||
return
|
||||
continue
|
||||
}
|
||||
|
||||
action, err := kclp.handleLine(line)
|
||||
err = kclp.handleLine(line)
|
||||
if err != nil {
|
||||
kclp.ioHandler.writeError(fmt.Sprintf("ERR Handle line: %+#v", err))
|
||||
return
|
||||
}
|
||||
|
||||
kclp.ckpmux.Lock()
|
||||
if !kclp.nextCheckpointPair.IsEmpty() {
|
||||
err := kclp.sendCheckpoint(kclp.nextCheckpointPair, 5)
|
||||
seq := kclp.nextCheckpointPair.Sequence.String()
|
||||
subSeq := kclp.nextCheckpointPair.SubSequence
|
||||
|
||||
err := kclp.sendCheckpoint(&seq, &subSeq)
|
||||
if err != nil {
|
||||
kclp.ioHandler.writeError(fmt.Sprintf("ERR checkpoint: %+#v", err))
|
||||
}
|
||||
} else {
|
||||
kclp.nextCheckpointPair = SequencePair{}
|
||||
}
|
||||
|
||||
err = kclp.reportDone(action)
|
||||
if err != nil {
|
||||
kclp.ioHandler.writeError(fmt.Sprintf("ERR report done: %s, %+#v", action, err))
|
||||
return
|
||||
}
|
||||
kclp.ckpmux.Unlock()
|
||||
|
||||
if kclp.isShuttingDown {
|
||||
kclp.sendCheckpoint(SequencePair{}, 5) // Empty SequencePair is signal to shutdown
|
||||
kclp.sendCheckpoint(nil, nil) // nil sequence num is signal to shutdown
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue