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channel_store_v2.go
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channel_store_v2.go
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package datacoord
import (
"strconv"
"github.com/cockroachdb/errors"
"github.com/golang/protobuf/proto"
"github.com/samber/lo"
"go.uber.org/zap"
"github.com/milvus-io/milvus/internal/kv"
"github.com/milvus-io/milvus/internal/proto/datapb"
"github.com/milvus-io/milvus/pkg/log"
"github.com/milvus-io/milvus/pkg/metrics"
"github.com/milvus-io/milvus/pkg/util/timerecord"
)
type StateChannelStore struct {
store kv.TxnKV
channelsInfo map[int64]*NodeChannelInfo // A map of (nodeID) -> (NodeChannelInfo).
}
var _ RWChannelStore = (*StateChannelStore)(nil)
var errChannelNotExistInNode = errors.New("channel doesn't exist in given node")
func NewChannelStoreV2(kv kv.TxnKV) RWChannelStore {
return NewStateChannelStore(kv)
}
func NewStateChannelStore(kv kv.TxnKV) *StateChannelStore {
c := StateChannelStore{
store: kv,
channelsInfo: make(map[int64]*NodeChannelInfo),
}
c.channelsInfo[bufferID] = &NodeChannelInfo{
NodeID: bufferID,
Channels: make(map[string]RWChannel),
}
return &c
}
func (c *StateChannelStore) Reload() error {
record := timerecord.NewTimeRecorder("datacoord")
keys, values, err := c.store.LoadWithPrefix(Params.CommonCfg.DataCoordWatchSubPath.GetValue())
if err != nil {
return err
}
for i := 0; i < len(keys); i++ {
k := keys[i]
v := values[i]
nodeID, err := parseNodeKey(k)
if err != nil {
return err
}
info := &datapb.ChannelWatchInfo{}
if err := proto.Unmarshal([]byte(v), info); err != nil {
return err
}
reviseVChannelInfo(info.GetVchan())
c.AddNode(nodeID)
channel := NewStateChannelByWatchInfo(nodeID, info)
c.channelsInfo[nodeID].AddChannel(channel)
log.Info("channel store reload channel",
zap.Int64("nodeID", nodeID), zap.String("channel", channel.Name))
metrics.DataCoordDmlChannelNum.WithLabelValues(strconv.FormatInt(nodeID, 10)).Set(float64(len(c.channelsInfo[nodeID].Channels)))
}
log.Info("channel store reload done", zap.Duration("duration", record.ElapseSpan()))
return nil
}
func (c *StateChannelStore) AddNode(nodeID int64) {
if _, ok := c.channelsInfo[nodeID]; ok {
return
}
c.channelsInfo[nodeID] = &NodeChannelInfo{
NodeID: nodeID,
Channels: make(map[string]RWChannel),
}
}
func (c *StateChannelStore) UpdateState(isSuccessful bool, channels ...RWChannel) {
lo.ForEach(channels, func(ch RWChannel, _ int) {
for _, cInfo := range c.channelsInfo {
if stateChannel, ok := cInfo.Channels[ch.GetName()]; ok {
if isSuccessful {
stateChannel.(*StateChannel).TransitionOnSuccess()
} else {
stateChannel.(*StateChannel).TransitionOnFailure()
}
}
}
})
}
func (c *StateChannelStore) SetLegacyChannelByNode(nodeIDs ...int64) {
lo.ForEach(nodeIDs, func(nodeID int64, _ int) {
if cInfo, ok := c.channelsInfo[nodeID]; ok {
for _, ch := range cInfo.Channels {
ch.(*StateChannel).setState(Legacy)
}
}
})
}
func (c *StateChannelStore) Update(opSet *ChannelOpSet) error {
// Split opset into multiple txn. Operations on the same channel must be executed in one txn.
perChOps := opSet.SplitByChannel()
// Execute a txn for every 64 operations.
count := 0
operations := make([]*ChannelOp, 0, maxOperationsPerTxn)
for _, opset := range perChOps {
if !c.sanityCheckPerChannelOpSet(opset) {
log.Error("unsupported ChannelOpSet", zap.Any("OpSet", opset))
continue
}
if opset.Len() > maxOperationsPerTxn {
log.Error("Operations for one channel exceeds maxOperationsPerTxn",
zap.Any("opset size", opset.Len()),
zap.Int("limit", maxOperationsPerTxn))
}
if count+opset.Len() > maxOperationsPerTxn {
if err := c.updateMeta(NewChannelOpSet(operations...)); err != nil {
return err
}
count = 0
operations = make([]*ChannelOp, 0, maxOperationsPerTxn)
}
count += opset.Len()
operations = append(operations, opset.Collect()...)
}
if count == 0 {
return nil
}
return c.updateMeta(NewChannelOpSet(operations...))
}
// remove from the assignments
func (c *StateChannelStore) removeAssignment(nodeID int64, channelName string) {
if cInfo, ok := c.channelsInfo[nodeID]; ok {
delete(cInfo.Channels, channelName)
}
}
func (c *StateChannelStore) addAssignment(nodeID int64, channel RWChannel) {
if cInfo, ok := c.channelsInfo[nodeID]; ok {
cInfo.Channels[channel.GetName()] = channel
} else {
c.channelsInfo[nodeID] = &NodeChannelInfo{
NodeID: nodeID,
Channels: map[string]RWChannel{
channel.GetName(): channel,
},
}
}
}
// updateMeta applies the WATCH/RELEASE/DELETE operations to the current channel store.
// DELETE + WATCH ---> from bufferID to nodeID
// DELETE + WATCH ---> from lagecyID to nodeID
// DELETE + WATCH ---> from deletedNode to nodeID/bufferID
// RELEASE ---> release from nodeID
// WATCH ---> watch to a new channel
// DELETE ---> remove the channel
func (c *StateChannelStore) sanityCheckPerChannelOpSet(opSet *ChannelOpSet) bool {
if opSet.Len() == 2 {
ops := opSet.Collect()
return (ops[0].Type == Delete && ops[1].Type == Watch) || (ops[1].Type == Delete && ops[0].Type == Watch)
} else if opSet.Len() == 1 {
t := opSet.Collect()[0].Type
return t == Delete || t == Watch || t == Release
}
return false
}
// DELETE + WATCH
func (c *StateChannelStore) updateMetaMemoryForPairOp(chName string, opSet *ChannelOpSet) error {
if !c.sanityCheckPerChannelOpSet(opSet) {
return errUnknownOpType
}
ops := opSet.Collect()
op1 := ops[1]
op2 := ops[0]
if ops[0].Type == Delete {
op1 = ops[0]
op2 = ops[1]
}
cInfo, ok := c.channelsInfo[op1.NodeID]
if !ok {
return errChannelNotExistInNode
}
var ch *StateChannel
if channel, ok := cInfo.Channels[chName]; ok {
ch = channel.(*StateChannel)
c.addAssignment(op2.NodeID, ch)
c.removeAssignment(op1.NodeID, chName)
} else {
if cInfo, ok = c.channelsInfo[op2.NodeID]; ok {
if channel2, ok := cInfo.Channels[chName]; ok {
ch = channel2.(*StateChannel)
}
}
}
// update channel
if ch != nil {
ch.Assign(op2.NodeID)
if op2.NodeID == bufferID {
ch.setState(Standby)
} else {
ch.setState(ToWatch)
}
}
return nil
}
func (c *StateChannelStore) getChannel(nodeID int64, channelName string) *StateChannel {
if cInfo, ok := c.channelsInfo[nodeID]; ok {
if storedChannel, ok := cInfo.Channels[channelName]; ok {
return storedChannel.(*StateChannel)
}
log.Error("Channel doesn't exist in Node", zap.String("channel", channelName), zap.Int64("nodeID", nodeID))
} else {
log.Error("Node doesn't exist", zap.Int64("NodeID", nodeID))
}
return nil
}
func (c *StateChannelStore) updateMetaMemoryForSingleOp(op *ChannelOp) error {
lo.ForEach(op.Channels, func(ch RWChannel, _ int) {
switch op.Type {
case Release: // release an already exsits storedChannel-node pair
if channel := c.getChannel(op.NodeID, ch.GetName()); channel != nil {
channel.setState(ToRelease)
}
case Watch:
storedChannel := c.getChannel(op.NodeID, ch.GetName())
if storedChannel == nil { // New Channel
// set the correct assigment and state for NEW stateChannel
newChannel := NewStateChannel(ch)
newChannel.Assign(op.NodeID)
if op.NodeID != bufferID {
newChannel.setState(ToWatch)
}
// add channel to memory
c.addAssignment(op.NodeID, newChannel)
} else { // assign to the original nodes
storedChannel.setState(ToWatch)
}
case Delete: // Remove Channel
// if not Delete from bufferID, remove from channel
if op.NodeID != bufferID {
c.removeAssignment(op.NodeID, ch.GetName())
}
default:
log.Error("unknown opType in updateMetaMemoryForSingleOp", zap.Any("type", op.Type))
}
})
return nil
}
func (c *StateChannelStore) updateMeta(opSet *ChannelOpSet) error {
// Update ChannelStore's kv store.
if err := c.txn(opSet); err != nil {
return err
}
// Update memory
chOpSet := opSet.SplitByChannel()
for chName, ops := range chOpSet {
// DELETE + WATCH
if ops.Len() == 2 {
c.updateMetaMemoryForPairOp(chName, ops)
// RELEASE, DELETE, WATCH
} else if ops.Len() == 1 {
c.updateMetaMemoryForSingleOp(ops.Collect()[0])
} else {
log.Error("unsupported ChannelOpSet", zap.Any("OpSet", ops))
}
}
return nil
}
// txn updates the channelStore's kv store with the given channel ops.
func (c *StateChannelStore) txn(opSet *ChannelOpSet) error {
var (
saves = make(map[string]string)
removals []string
)
for _, op := range opSet.Collect() {
opSaves, opRemovals, err := op.BuildKV()
if err != nil {
return err
}
saves = lo.Assign(opSaves, saves)
removals = append(removals, opRemovals...)
}
return c.store.MultiSaveAndRemove(saves, removals)
}
func (c *StateChannelStore) RemoveNode(nodeID int64) {
delete(c.channelsInfo, nodeID)
}
func (c *StateChannelStore) HasChannel(channel string) bool {
for _, info := range c.channelsInfo {
if _, ok := info.Channels[channel]; ok {
return true
}
}
return false
}
type (
ChannelSelector func(ch *StateChannel) bool
NodeSelector func(ID int64) bool
)
func WithAllNodes() NodeSelector {
return func(ID int64) bool {
return true
}
}
func WithoutBufferNode() NodeSelector {
return func(ID int64) bool {
return ID != int64(bufferID)
}
}
func WithNodeIDs(IDs ...int64) NodeSelector {
return func(ID int64) bool {
return lo.Contains(IDs, ID)
}
}
func WithoutNodeIDs(IDs ...int64) NodeSelector {
return func(ID int64) bool {
return !lo.Contains(IDs, ID)
}
}
func WithChannelName(channel string) ChannelSelector {
return func(ch *StateChannel) bool {
return ch.GetName() == channel
}
}
func WithCollectionIDV2(collectionID int64) ChannelSelector {
return func(ch *StateChannel) bool {
return ch.GetCollectionID() == collectionID
}
}
func WithChannelStates(states ...ChannelState) ChannelSelector {
return func(ch *StateChannel) bool {
return lo.Contains(states, ch.currentState)
}
}
func (c *StateChannelStore) GetNodeChannelsBy(nodeSelector NodeSelector, channelSelectors ...ChannelSelector) []*NodeChannelInfo {
nodeChannels := make(map[int64]*NodeChannelInfo)
for nodeID, cInfo := range c.channelsInfo {
if nodeSelector(nodeID) {
selected := make(map[string]RWChannel)
for chName, channel := range cInfo.Channels {
var sel bool = true
for _, selector := range channelSelectors {
if !selector(channel.(*StateChannel)) {
sel = false
break
}
}
if sel {
selected[chName] = channel
}
}
nodeChannels[nodeID] = &NodeChannelInfo{
NodeID: nodeID,
Channels: selected,
}
}
}
return lo.Values(nodeChannels)
}
func (c *StateChannelStore) GetNodesChannels() []*NodeChannelInfo {
ret := make([]*NodeChannelInfo, 0, len(c.channelsInfo))
for id, info := range c.channelsInfo {
if id != bufferID {
ret = append(ret, info)
}
}
return ret
}
func (c *StateChannelStore) GetBufferChannelInfo() *NodeChannelInfo {
return c.GetNode(bufferID)
}
func (c *StateChannelStore) GetNode(nodeID int64) *NodeChannelInfo {
if info, ok := c.channelsInfo[nodeID]; ok {
return info
}
return nil
}
func (c *StateChannelStore) GetNodeChannelCount(nodeID int64) int {
if cInfo, ok := c.channelsInfo[nodeID]; ok {
return len(cInfo.Channels)
}
return 0
}
func (c *StateChannelStore) GetNodes() []int64 {
return lo.Filter(lo.Keys(c.channelsInfo), func(ID int64, _ int) bool {
return ID != bufferID
})
}
// remove deletes kv pairs from the kv store where keys have given nodeID as prefix.
func (c *StateChannelStore) remove(nodeID int64) error {
k := buildKeyPrefix(nodeID)
return c.store.RemoveWithPrefix(k)
}