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raft cluster

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wip: raft does not care about migrating

wip: optimize code

wip: raft election

wip

wip: fix raft leader missing log entries

wip

fix a dead lock

batch set slot route

wip: raft persist

wip

refactor cluster suite

remove relay

rename relay2

refactor: allow customizing client factory

test raft

refactor re-balance

avoid errors caused by inconsistent status on follower nodes during raft commits

test raft election
This commit is contained in:
finley
2023-01-02 21:27:06 +08:00
parent df672d4c92
commit bf7f628810
54 changed files with 3122 additions and 703 deletions
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43
cluster/utils.go
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@@ -1,10 +1,7 @@
package cluster
import (
"github.com/hdt3213/godis/config"
"github.com/hdt3213/godis/interface/redis"
"github.com/hdt3213/godis/redis/protocol"
"strconv"
)
func ping(cluster *Cluster, c redis.Connection, cmdLine CmdLine) redis.Reply {
@@ -26,7 +23,7 @@ func makeArgs(cmd string, args ...string) [][]byte {
func (cluster *Cluster) groupBy(keys []string) map[string][]string {
result := make(map[string][]string)
for _, key := range keys {
peer := cluster.peerPicker.PickNode(key)
peer := cluster.pickNodeAddrByKey(key)
group, ok := result[peer]
if !ok {
group = make([]string, 0)
@@ -37,14 +34,34 @@ func (cluster *Cluster) groupBy(keys []string) map[string][]string {
return result
}
func execSelect(c redis.Connection, args [][]byte) redis.Reply {
dbIndex, err := strconv.Atoi(string(args[1]))
if err != nil {
return protocol.MakeErrReply("ERR invalid DB index")
// pickNode returns the node id hosting the given slot.
// If the slot is migrating, return the node which is importing the slot
func (cluster *Cluster) pickNode(slotID uint32) *Node {
// check cluster.slot to avoid errors caused by inconsistent status on follower nodes during raft commits
// see cluster.reBalance()
hSlot := cluster.getHostSlot(slotID)
if hSlot != nil {
switch hSlot.state {
case slotStateMovingOut:
return cluster.topology.GetNode(hSlot.newNodeID)
case slotStateImporting, slotStateHost:
return cluster.topology.GetNode(cluster.self)
}
}
if dbIndex >= config.Properties.Databases || dbIndex < 0 {
return protocol.MakeErrReply("ERR DB index is out of range")
}
c.SelectDB(dbIndex)
return protocol.MakeOkReply()
slot := cluster.topology.GetSlots()[int(slotID)]
node := cluster.topology.GetNode(slot.NodeID)
return node
}
func (cluster *Cluster) pickNodeAddrByKey(key string) string {
slotId := getSlot(key)
return cluster.pickNode(slotId).Addr
}
func modifyCmd(cmdLine CmdLine, newCmd string) CmdLine {
var cmdLine2 CmdLine
cmdLine2 = append(cmdLine2, cmdLine...)
cmdLine2[0] = []byte(newCmd)
return cmdLine2
}