removing etcd sequencer

causing go mod tidy problem. If anyone wants this, please help to resolve this first.

github.com/chrislusf/seaweedfs/weed/sequence imports
	go.etcd.io/etcd/client tested by
	go.etcd.io/etcd/client.test imports
	github.com/coreos/etcd/integration imports
	github.com/coreos/etcd/proxy/grpcproxy imports
	google.golang.org/grpc/naming: module google.golang.org/grpc@latest found (v1.41.0), but does not contain package google.golang.org/grpc/naming

3 files changed, 1 insertions, 310 deletions

diff --git a/weed/command/scaffold/master.toml b/weed/command/scaffold/master.toml
index 020f48e36..363493db3 100644
--- a/weed/command/scaffold/master.toml
+++ b/weed/command/scaffold/master.toml
@@ -23,10 +23,7 @@ default = "localhost:8888"    # used by maintenance scripts if the scripts needs
 
 
 [master.sequencer]
-type = "raft"     # Choose [raft|etcd|snowflake] type for storing the file id sequence
-# when sequencer.type = etcd, set listen client urls of etcd cluster that store file id sequence
-# example : http://127.0.0.1:2379,http://127.0.0.1:2389
-sequencer_etcd_urls = "http://127.0.0.1:2379"
+type = "raft"     # Choose [raft|snowflake] type for storing the file id sequence
 # when sequencer.type = snowflake, the snowflake id must be different from other masters
 sequencer_snowflake_id = 0     # any number between 1~1023
 
diff --git a/weed/sequence/etcd_sequencer.go b/weed/sequence/etcd_sequencer.go
deleted file mode 100644
index a9f2bb97f..000000000
--- a/weed/sequence/etcd_sequencer.go
+++ /dev/null
@@ -1,296 +0,0 @@
-package sequence
-
-/*
-Note :
-(1) store the sequence in the ETCD cluster, and local file(sequence.dat)
-(2) batch get the sequences from ETCD cluster, and store the max sequence id in the local file
-(3) the sequence range is : [currentSeqId, maxSeqId), when the currentSeqId >= maxSeqId, fetch the new maxSeqId.
-*/
-
-import (
-	"context"
-	"fmt"
-	"go.etcd.io/etcd/client"
-	"sync"
-	"time"
-
-	"io"
-	"os"
-	"strconv"
-	"strings"
-
-	"github.com/chrislusf/seaweedfs/weed/glog"
-)
-
-const (
-	// EtcdKeyPrefix                   = "/seaweedfs"
-	EtcdKeySequence                 = "/master/sequence"
-	EtcdContextTimeoutSecond        = 100 * time.Second
-	DefaultEtcdSteps         uint64 = 500 // internal counter
-	SequencerFileName               = "sequencer.dat"
-	FileMaxSequenceLength           = 128
-)
-
-type EtcdSequencer struct {
-	sequenceLock sync.Mutex
-
-	// available sequence range : [currentSeqId, maxSeqId)
-	currentSeqId uint64
-	maxSeqId     uint64
-
-	keysAPI client.KeysAPI
-	seqFile *os.File
-}
-
-func NewEtcdSequencer(etcdUrls string, metaFolder string) (*EtcdSequencer, error) {
-	file, err := openSequenceFile(metaFolder + "/" + SequencerFileName)
-	if nil != err {
-		return nil, fmt.Errorf("open sequence file fialed, %v", err)
-	}
-
-	cli, err := client.New(client.Config{
-		Endpoints: strings.Split(etcdUrls, ","),
-		Username:  "",
-		Password:  "",
-	})
-	if err != nil {
-		return nil, err
-	}
-	keysApi := client.NewKeysAPI(cli)
-
-	// TODO: the current sequence id in local file is not used
-	maxValue, _, err := readSequenceFile(file)
-	if err != nil {
-		return nil, fmt.Errorf("read sequence from file failed, %v", err)
-	}
-	glog.V(4).Infof("read sequence from file : %d", maxValue)
-
-	newSeq, err := setMaxSequenceToEtcd(keysApi, maxValue)
-	if err != nil {
-		return nil, err
-	}
-
-	sequencer := &EtcdSequencer{maxSeqId: newSeq,
-		currentSeqId: newSeq,
-		keysAPI:      keysApi,
-		seqFile:      file,
-	}
-	return sequencer, nil
-}
-
-func (es *EtcdSequencer) NextFileId(count uint64) uint64 {
-	es.sequenceLock.Lock()
-	defer es.sequenceLock.Unlock()
-
-	if (es.currentSeqId + count) >= es.maxSeqId {
-		reqSteps := DefaultEtcdSteps
-		if count > DefaultEtcdSteps {
-			reqSteps += count
-		}
-		maxId, err := batchGetSequenceFromEtcd(es.keysAPI, reqSteps)
-		glog.V(4).Infof("get max sequence id from etcd, %d", maxId)
-		if err != nil {
-			glog.Error(err)
-			return 0
-		}
-		es.currentSeqId, es.maxSeqId = maxId-reqSteps, maxId
-		glog.V(4).Infof("current id : %d, max id : %d", es.currentSeqId, es.maxSeqId)
-
-		if err := writeSequenceFile(es.seqFile, es.maxSeqId, es.currentSeqId); err != nil {
-			glog.Errorf("flush sequence to file failed, %v", err)
-		}
-	}
-
-	ret := es.currentSeqId
-	es.currentSeqId += count
-	return ret
-}
-
-/**
-instead of collecting the max value from volume server,
-the max value should be saved in local config file and ETCD cluster
-*/
-func (es *EtcdSequencer) SetMax(seenValue uint64) {
-	es.sequenceLock.Lock()
-	defer es.sequenceLock.Unlock()
-	if seenValue > es.maxSeqId {
-		maxId, err := setMaxSequenceToEtcd(es.keysAPI, seenValue)
-		if err != nil {
-			glog.Errorf("set Etcd Max sequence failed : %v", err)
-			return
-		}
-		es.currentSeqId, es.maxSeqId = maxId, maxId
-
-		if err := writeSequenceFile(es.seqFile, maxId, maxId); err != nil {
-			glog.Errorf("flush sequence to file failed, %v", err)
-		}
-	}
-}
-
-func (es *EtcdSequencer) GetMax() uint64 {
-	return es.maxSeqId
-}
-
-func (es *EtcdSequencer) Peek() uint64 {
-	return es.currentSeqId
-}
-
-func batchGetSequenceFromEtcd(kvApi client.KeysAPI, step uint64) (uint64, error) {
-	if step <= 0 {
-		return 0, fmt.Errorf("the step must be large than 1")
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), EtcdContextTimeoutSecond)
-	var endSeqValue uint64 = 0
-	defer cancel()
-	for {
-		getResp, err := kvApi.Get(ctx, EtcdKeySequence, &client.GetOptions{Recursive: false, Quorum: true})
-		if err != nil {
-			return 0, err
-		}
-		if getResp.Node == nil {
-			continue
-		}
-
-		prevValue := getResp.Node.Value
-		prevSeqValue, err := strconv.ParseUint(prevValue, 10, 64)
-		if err != nil {
-			return 0, fmt.Errorf("get sequence from etcd failed, %v", err)
-		}
-		endSeqValue = prevSeqValue + step
-		endSeqStr := strconv.FormatUint(endSeqValue, 10)
-
-		_, err = kvApi.Set(ctx, EtcdKeySequence, endSeqStr, &client.SetOptions{PrevValue: prevValue})
-		if err == nil {
-			break
-		}
-		glog.Error(err)
-	}
-
-	return endSeqValue, nil
-}
-
-/**
-update the value of the key EtcdKeySequence in ETCD cluster with the parameter of maxSeq,
-when the value of the key EtcdKeySequence is equal to or large than the parameter maxSeq,
-return the value of EtcdKeySequence in the ETCD cluster;
-when the value of the EtcdKeySequence is less than the parameter maxSeq,
-return the value of the parameter maxSeq
-*/
-func setMaxSequenceToEtcd(kvApi client.KeysAPI, maxSeq uint64) (uint64, error) {
-	maxSeqStr := strconv.FormatUint(maxSeq, 10)
-	ctx, cancel := context.WithTimeout(context.Background(), EtcdContextTimeoutSecond)
-	defer cancel()
-
-	for {
-		getResp, err := kvApi.Get(ctx, EtcdKeySequence, &client.GetOptions{Recursive: false, Quorum: true})
-		if err != nil {
-			if ce, ok := err.(client.Error); ok && (ce.Code == client.ErrorCodeKeyNotFound) {
-				_, err := kvApi.Create(ctx, EtcdKeySequence, maxSeqStr)
-				if err == nil {
-					continue
-				}
-				if ce, ok = err.(client.Error); ok && (ce.Code == client.ErrorCodeNodeExist) {
-					continue
-				}
-				return 0, err
-			} else {
-				return 0, err
-			}
-		}
-
-		if getResp.Node == nil {
-			continue
-		}
-		prevSeqStr := getResp.Node.Value
-		prevSeq, err := strconv.ParseUint(prevSeqStr, 10, 64)
-		if err != nil {
-			return 0, err
-		}
-		if prevSeq >= maxSeq {
-			return prevSeq, nil
-		}
-
-		_, err = kvApi.Set(ctx, EtcdKeySequence, maxSeqStr, &client.SetOptions{PrevValue: prevSeqStr})
-		if err != nil {
-			return 0, err
-		}
-	}
-}
-
-func openSequenceFile(file string) (*os.File, error) {
-	_, err := os.Stat(file)
-	if os.IsNotExist(err) {
-		fid, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE, 0644)
-		if err != nil {
-			return nil, err
-		}
-		if err := writeSequenceFile(fid, 1, 0); err != nil {
-			return nil, err
-		}
-		return fid, nil
-	} else {
-		return os.OpenFile(file, os.O_RDWR|os.O_CREATE, 0644)
-	}
-}
-
-/*
-read sequence and step from sequence file
-*/
-func readSequenceFile(file *os.File) (uint64, uint64, error) {
-	sequence := make([]byte, FileMaxSequenceLength)
-	size, err := file.ReadAt(sequence, 0)
-	if (err != nil) && (err != io.EOF) {
-		err := fmt.Errorf("cannot read file %s, %v", file.Name(), err)
-		return 0, 0, err
-	}
-	sequence = sequence[0:size]
-	seqs := strings.Split(string(sequence), ":")
-	maxId, err := strconv.ParseUint(seqs[0], 10, 64)
-	if err != nil {
-		return 0, 0, fmt.Errorf("parse sequence from file failed, %v", err)
-	}
-
-	if len(seqs) > 1 {
-		step, err := strconv.ParseUint(seqs[1], 10, 64)
-		if err != nil {
-			return 0, 0, fmt.Errorf("parse sequence from file failed, %v", err)
-		}
-		return maxId, step, nil
-	}
-
-	return maxId, 0, nil
-}
-
-/**
-write the sequence and step to sequence file
-*/
-func writeSequenceFile(file *os.File, sequence, step uint64) error {
-	_ = step
-	seqStr := fmt.Sprintf("%d:%d", sequence, sequence)
-	if _, err := file.Seek(0, 0); err != nil {
-		err = fmt.Errorf("cannot seek to the beginning of %s: %v", file.Name(), err)
-		return err
-	}
-	if err := file.Truncate(0); err != nil {
-		return fmt.Errorf("truncate sequence file faield : %v", err)
-	}
-	if _, err := file.WriteString(seqStr); err != nil {
-		return fmt.Errorf("write file %s failed, %v", file.Name(), err)
-	}
-	if err := file.Sync(); err != nil {
-		return fmt.Errorf("flush file %s failed, %v", file.Name(), err)
-	}
-	return nil
-}
-
-// the UT helper method
-// func deleteEtcdKey(kvApi client.KeysAPI, key string) error {
-// 	ctx, cancel := context.WithTimeout(context.Background(), EtcdContextTimeoutSecond)
-// 	defer cancel()
-// 	_, err := kvApi.Delete(ctx, key, &client.DeleteOptions{Dir: false})
-// 	if err != nil {
-// 		return err
-// 	}
-// 	return nil
-// }
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 8de01abf7..3b3b1c94b 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -28,7 +28,6 @@ import (
 
 const (
 	SequencerType        = "master.sequencer.type"
-	SequencerEtcdUrls    = "master.sequencer.sequencer_etcd_urls"
 	SequencerSnowflakeId = "master.sequencer.sequencer_snowflake_id"
 )
 
@@ -286,15 +285,6 @@ func (ms *MasterServer) createSequencer(option *MasterOption) sequence.Sequencer
 	seqType := strings.ToLower(v.GetString(SequencerType))
 	glog.V(1).Infof("[%s] : [%s]", SequencerType, seqType)
 	switch strings.ToLower(seqType) {
-	case "etcd":
-		var err error
-		urls := v.GetString(SequencerEtcdUrls)
-		glog.V(0).Infof("[%s] : [%s]", SequencerEtcdUrls, urls)
-		seq, err = sequence.NewEtcdSequencer(urls, option.MetaFolder)
-		if err != nil {
-			glog.Error(err)
-			seq = nil
-		}
 	case "snowflake":
 		var err error
 		snowflakeId := v.GetInt(SequencerSnowflakeId)