/
shared_region_worker.go
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/
shared_region_worker.go
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// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package kv
import (
"context"
"encoding/hex"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/kvproto/pkg/cdcpb"
"github.com/pingcap/log"
"github.com/pingcap/tiflow/cdc/model"
cerror "github.com/pingcap/tiflow/pkg/errors"
"github.com/pingcap/tiflow/pkg/spanz"
"github.com/prometheus/client_golang/prometheus"
"go.uber.org/zap"
)
// The magic number here is keep the same with some magic numbers in some
// other components in TiCDC, including worker pool task chan size, mounter
// chan size etc.
// TODO: unified channel buffer mechanism
var regionWorkerInputChanSize = 32
type regionWorkerMetrics struct {
metricReceivedEventSize prometheus.Observer
metricDroppedEventSize prometheus.Observer
metricPullEventInitializedCounter prometheus.Counter
metricPullEventCommittedCounter prometheus.Counter
metricPullEventPrewriteCounter prometheus.Counter
metricPullEventCommitCounter prometheus.Counter
metricPullEventRollbackCounter prometheus.Counter
metricSendEventResolvedCounter prometheus.Counter
metricSendEventCommitCounter prometheus.Counter
metricSendEventCommittedCounter prometheus.Counter
metricQueueDuration prometheus.Observer
metricWorkerBusyRatio prometheus.Gauge
metricWorkerChannelSize prometheus.Gauge
}
func newRegionWorkerMetrics(changefeedID model.ChangeFeedID, tableID string, storeAddr string) *regionWorkerMetrics {
metrics := ®ionWorkerMetrics{}
metrics.metricReceivedEventSize = eventSize.WithLabelValues("received")
metrics.metricDroppedEventSize = eventSize.WithLabelValues("dropped")
metrics.metricPullEventInitializedCounter = pullEventCounter.
WithLabelValues(cdcpb.Event_INITIALIZED.String(), changefeedID.Namespace, changefeedID.ID)
metrics.metricPullEventCommittedCounter = pullEventCounter.
WithLabelValues(cdcpb.Event_COMMITTED.String(), changefeedID.Namespace, changefeedID.ID)
metrics.metricPullEventPrewriteCounter = pullEventCounter.
WithLabelValues(cdcpb.Event_PREWRITE.String(), changefeedID.Namespace, changefeedID.ID)
metrics.metricPullEventCommitCounter = pullEventCounter.
WithLabelValues(cdcpb.Event_COMMIT.String(), changefeedID.Namespace, changefeedID.ID)
metrics.metricPullEventRollbackCounter = pullEventCounter.
WithLabelValues(cdcpb.Event_ROLLBACK.String(), changefeedID.Namespace, changefeedID.ID)
metrics.metricSendEventResolvedCounter = sendEventCounter.
WithLabelValues("native-resolved", changefeedID.Namespace, changefeedID.ID)
metrics.metricSendEventCommitCounter = sendEventCounter.
WithLabelValues("commit", changefeedID.Namespace, changefeedID.ID)
metrics.metricSendEventCommittedCounter = sendEventCounter.
WithLabelValues("committed", changefeedID.Namespace, changefeedID.ID)
metrics.metricQueueDuration = regionWorkerQueueDuration.
WithLabelValues(changefeedID.Namespace, changefeedID.ID)
metrics.metricWorkerBusyRatio = workerBusyRatio.WithLabelValues(
changefeedID.Namespace, changefeedID.ID, tableID, storeAddr, "event-handler")
metrics.metricWorkerChannelSize = workerChannelSize.WithLabelValues(
changefeedID.Namespace, changefeedID.ID, tableID, storeAddr, "input")
return metrics
}
// NOTE:
// 1. all contents come from one same TiKV store stream;
// 2. eventItem and resolvedTs shouldn't appear simultaneously;
type statefulEvent struct {
eventItem eventItem
resolvedTsBatch resolvedTsBatch
stream *requestedStream
start time.Time
}
type eventItem struct {
// All items come from one same region.
item *cdcpb.Event
state *regionFeedState
}
// NOTE: all regions must come from the same subscribedTable, and regions will never be empty.
type resolvedTsBatch struct {
ts uint64
regions []*regionFeedState
}
func newEventItem(item *cdcpb.Event, state *regionFeedState, stream *requestedStream) statefulEvent {
return statefulEvent{
eventItem: eventItem{item, state},
stream: stream,
start: time.Now(),
}
}
func newResolvedTsBatch(ts uint64, stream *requestedStream) statefulEvent {
return statefulEvent{
resolvedTsBatch: resolvedTsBatch{ts: ts},
stream: stream,
start: time.Now(),
}
}
type sharedRegionWorker struct {
changefeed model.ChangeFeedID
client *SharedClient
inputCh chan statefulEvent
metrics *regionWorkerMetrics
}
func newSharedRegionWorker(c *SharedClient) *sharedRegionWorker {
return &sharedRegionWorker{
changefeed: c.changefeed,
client: c,
inputCh: make(chan statefulEvent, regionWorkerInputChanSize),
metrics: newRegionWorkerMetrics(c.changefeed, "shared", "shared"),
}
}
func (w *sharedRegionWorker) sendEvent(ctx context.Context, event statefulEvent) error {
select {
case <-ctx.Done():
return ctx.Err()
case w.inputCh <- event:
return nil
}
}
func (w *sharedRegionWorker) run(ctx context.Context) error {
for {
var event statefulEvent
select {
case <-ctx.Done():
return ctx.Err()
case event = <-w.inputCh:
}
w.metrics.metricQueueDuration.Observe(float64(time.Since(event.start).Milliseconds()))
w.processEvent(ctx, event)
}
}
func (w *sharedRegionWorker) handleSingleRegionError(state *regionFeedState, stream *requestedStream) {
stepsToRemoved := state.markRemoved()
err := state.takeError()
if err != nil {
w.client.logRegionDetails("region worker get a region error",
zap.String("namespace", w.changefeed.Namespace),
zap.String("changefeed", w.changefeed.ID),
zap.Uint64("streamID", stream.streamID),
zap.Any("subscriptionID", state.getRegionID()),
zap.Uint64("regionID", state.region.verID.GetID()),
zap.Bool("reschedule", stepsToRemoved),
zap.Error(err))
}
if stepsToRemoved {
stream.takeState(SubscriptionID(state.requestID), state.getRegionID())
w.client.onRegionFail(newRegionErrorInfo(state.getRegionInfo(), err))
}
}
func (w *sharedRegionWorker) processEvent(ctx context.Context, event statefulEvent) {
if event.eventItem.state != nil {
state := event.eventItem.state
if state.isStale() {
w.handleSingleRegionError(state, event.stream)
return
}
w.metrics.metricReceivedEventSize.Observe(float64(event.eventItem.item.Event.Size()))
switch x := event.eventItem.item.Event.(type) {
case *cdcpb.Event_Entries_:
if err := w.handleEventEntry(ctx, x, state); err != nil {
state.markStopped(err)
w.handleSingleRegionError(state, event.stream)
return
}
case *cdcpb.Event_ResolvedTs:
w.handleResolvedTs(ctx, resolvedTsBatch{
ts: x.ResolvedTs,
regions: []*regionFeedState{state},
})
case *cdcpb.Event_Error:
state.markStopped(&eventError{err: x.Error})
w.handleSingleRegionError(state, event.stream)
return
case *cdcpb.Event_Admin_:
}
} else if len(event.resolvedTsBatch.regions) > 0 {
w.handleResolvedTs(ctx, event.resolvedTsBatch)
}
}
// NOTE: context.Canceled won't be treated as an error.
func (w *sharedRegionWorker) handleEventEntry(ctx context.Context, x *cdcpb.Event_Entries_, state *regionFeedState) error {
startTs := state.region.subscribedTable.startTs
emit := func(assembled model.RegionFeedEvent) bool {
e := newMultiplexingEvent(assembled, state.region.subscribedTable)
select {
case state.region.subscribedTable.eventCh <- e:
return true
case <-ctx.Done():
return false
}
}
tableID := state.region.subscribedTable.span.TableID
log.Debug("region worker get an Event",
zap.String("namespace", w.changefeed.Namespace),
zap.String("changefeed", w.changefeed.ID),
zap.Any("subscriptionID", state.region.subscribedTable.subscriptionID),
zap.Int64("tableID", tableID),
zap.Int("rows", len(x.Entries.GetEntries())))
return handleEventEntry(x, startTs, state, w.metrics, emit, w.changefeed, tableID, w.client.logRegionDetails)
}
func handleEventEntry(
x *cdcpb.Event_Entries_,
startTs uint64,
state *regionFeedState,
metrics *regionWorkerMetrics,
emit func(assembled model.RegionFeedEvent) bool,
changefeed model.ChangeFeedID,
tableID model.TableID,
logRegionDetails func(msg string, fields ...zap.Field),
) error {
regionID, regionSpan, _ := state.getRegionMeta()
for _, entry := range x.Entries.GetEntries() {
// NOTE: from TiKV 7.0.0, entries are already filtered out in TiKV side.
// We can remove the check in future.
comparableKey := spanz.ToComparableKey(entry.GetKey())
if entry.Type != cdcpb.Event_INITIALIZED &&
!spanz.KeyInSpan(comparableKey, regionSpan) {
metrics.metricDroppedEventSize.Observe(float64(entry.Size()))
continue
}
switch entry.Type {
case cdcpb.Event_INITIALIZED:
metrics.metricPullEventInitializedCounter.Inc()
state.setInitialized()
logRegionDetails("region is initialized",
zap.String("namespace", changefeed.Namespace),
zap.String("changefeed", changefeed.ID),
zap.Int64("tableID", tableID),
zap.Uint64("regionID", regionID),
zap.Uint64("requestID", state.requestID),
zap.Stringer("span", &state.region.span))
for _, cachedEvent := range state.matcher.matchCachedRow(true) {
revent, err := assembleRowEvent(regionID, cachedEvent)
if err != nil {
return errors.Trace(err)
}
if !emit(revent) {
return nil
}
metrics.metricSendEventCommitCounter.Inc()
}
state.matcher.matchCachedRollbackRow(true)
case cdcpb.Event_COMMITTED:
resolvedTs := state.getLastResolvedTs()
if entry.CommitTs <= resolvedTs {
logPanic("The CommitTs must be greater than the resolvedTs",
zap.String("EventType", "COMMITTED"),
zap.Uint64("CommitTs", entry.CommitTs),
zap.Uint64("resolvedTs", resolvedTs),
zap.Uint64("regionID", regionID))
return errUnreachable
}
metrics.metricPullEventCommittedCounter.Inc()
revent, err := assembleRowEvent(regionID, entry)
if err != nil {
return errors.Trace(err)
}
if !emit(revent) {
return nil
}
metrics.metricSendEventCommittedCounter.Inc()
case cdcpb.Event_PREWRITE:
metrics.metricPullEventPrewriteCounter.Inc()
state.matcher.putPrewriteRow(entry)
case cdcpb.Event_COMMIT:
metrics.metricPullEventCommitCounter.Inc()
// NOTE: matchRow should always be called even if the event is stale.
if !state.matcher.matchRow(entry, state.isInitialized()) {
if !state.isInitialized() {
state.matcher.cacheCommitRow(entry)
continue
}
return cerror.ErrPrewriteNotMatch.GenWithStackByArgs(
hex.EncodeToString(entry.GetKey()),
entry.GetStartTs(), entry.GetCommitTs(),
entry.GetType(), entry.GetOpType())
}
// TiKV can send events with StartTs/CommitTs less than startTs.
isStaleEvent := entry.CommitTs <= startTs
if isStaleEvent {
continue
}
// NOTE: state.getLastResolvedTs() will never less than startTs.
resolvedTs := state.getLastResolvedTs()
if entry.CommitTs <= resolvedTs {
logPanic("The CommitTs must be greater than the resolvedTs",
zap.String("EventType", "COMMIT"),
zap.Uint64("CommitTs", entry.CommitTs),
zap.Uint64("resolvedTs", resolvedTs),
zap.Uint64("regionID", regionID))
return errUnreachable
}
revent, err := assembleRowEvent(regionID, entry)
if err != nil {
return errors.Trace(err)
}
if !emit(revent) {
return nil
}
metrics.metricSendEventCommitCounter.Inc()
case cdcpb.Event_ROLLBACK:
metrics.metricPullEventRollbackCounter.Inc()
if !state.isInitialized() {
state.matcher.cacheRollbackRow(entry)
continue
}
state.matcher.rollbackRow(entry)
}
}
return nil
}
func assembleRowEvent(regionID uint64, entry *cdcpb.Event_Row) (model.RegionFeedEvent, error) {
var opType model.OpType
switch entry.GetOpType() {
case cdcpb.Event_Row_DELETE:
opType = model.OpTypeDelete
case cdcpb.Event_Row_PUT:
opType = model.OpTypePut
default:
return model.RegionFeedEvent{}, cerror.ErrUnknownKVEventType.GenWithStackByArgs(entry.GetOpType(), entry)
}
revent := model.RegionFeedEvent{
RegionID: regionID,
Val: &model.RawKVEntry{
OpType: opType,
Key: entry.Key,
Value: entry.GetValue(),
StartTs: entry.StartTs,
CRTs: entry.CommitTs,
RegionID: regionID,
OldValue: entry.GetOldValue(),
},
}
return revent, nil
}
func (w *sharedRegionWorker) handleResolvedTs(ctx context.Context, batch resolvedTsBatch) {
if w.client.config.KVClient.AdvanceIntervalInMs > 0 {
w.advanceTableSpan(ctx, batch)
} else {
w.forwardResolvedTsToPullerFrontier(ctx, batch)
}
}
func (w *sharedRegionWorker) forwardResolvedTsToPullerFrontier(ctx context.Context, batch resolvedTsBatch) {
resolvedSpans := make(map[SubscriptionID]*struct {
spans []model.RegionComparableSpan
subscribedTable *subscribedTable
})
for _, state := range batch.regions {
if state.isStale() || !state.isInitialized() {
continue
}
spansAndChan := resolvedSpans[state.region.subscribedTable.subscriptionID]
if spansAndChan == nil {
spansAndChan = &struct {
spans []model.RegionComparableSpan
subscribedTable *subscribedTable
}{subscribedTable: state.region.subscribedTable}
resolvedSpans[state.region.subscribedTable.subscriptionID] = spansAndChan
}
regionID := state.getRegionID()
lastResolvedTs := state.getLastResolvedTs()
if batch.ts < lastResolvedTs {
log.Debug("The resolvedTs is fallen back in kvclient",
zap.String("namespace", w.changefeed.Namespace),
zap.String("changefeed", w.changefeed.ID),
zap.Uint64("regionID", regionID),
zap.Uint64("resolvedTs", batch.ts),
zap.Uint64("lastResolvedTs", lastResolvedTs))
continue
}
state.updateResolvedTs(batch.ts)
span := model.RegionComparableSpan{Span: state.region.span, Region: regionID}
span.Span.TableID = state.region.subscribedTable.span.TableID
spansAndChan.spans = append(spansAndChan.spans, span)
}
for subscriptionID, spansAndChan := range resolvedSpans {
log.Debug("region worker get a ResolvedTs",
zap.String("namespace", w.changefeed.Namespace),
zap.String("changefeed", w.changefeed.ID),
zap.Any("subscriptionID", subscriptionID),
zap.Uint64("ResolvedTs", batch.ts),
zap.Int("spanCount", len(spansAndChan.spans)))
if len(spansAndChan.spans) > 0 {
revent := model.RegionFeedEvent{Resolved: &model.ResolvedSpans{
Spans: spansAndChan.spans, ResolvedTs: batch.ts,
}}
e := newMultiplexingEvent(revent, spansAndChan.subscribedTable)
select {
case spansAndChan.subscribedTable.eventCh <- e:
w.metrics.metricSendEventResolvedCounter.Add(float64(len(resolvedSpans)))
case <-ctx.Done():
}
}
}
}
func (w *sharedRegionWorker) advanceTableSpan(ctx context.Context, batch resolvedTsBatch) {
for _, state := range batch.regions {
if state.isStale() || !state.isInitialized() {
continue
}
regionID := state.getRegionID()
lastResolvedTs := state.getLastResolvedTs()
if batch.ts < lastResolvedTs {
log.Debug("The resolvedTs is fallen back in kvclient",
zap.String("namespace", w.changefeed.Namespace),
zap.String("changefeed", w.changefeed.ID),
zap.Uint64("regionID", regionID),
zap.Uint64("resolvedTs", batch.ts),
zap.Uint64("lastResolvedTs", lastResolvedTs))
continue
}
state.updateResolvedTs(batch.ts)
}
table := batch.regions[0].region.subscribedTable
now := time.Now().UnixMilli()
lastAdvance := table.lastAdvanceTime.Load()
if now-lastAdvance > int64(w.client.config.KVClient.AdvanceIntervalInMs) && table.lastAdvanceTime.CompareAndSwap(lastAdvance, now) {
ts := table.rangeLock.ResolvedTs()
if ts > table.startTs {
revent := model.RegionFeedEvent{
Resolved: &model.ResolvedSpans{
Spans: []model.RegionComparableSpan{{Span: table.span, Region: 0}},
ResolvedTs: ts,
},
}
e := newMultiplexingEvent(revent, table)
select {
case table.eventCh <- e:
w.metrics.metricSendEventResolvedCounter.Add(float64(len(batch.regions)))
case <-ctx.Done():
}
}
}
}