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fix: Add topic auto-creation and cache invalidation to ALL metadata handlers 

Critical fix for topic visibility race condition:

Problem: Consumers request metadata for topics created by producers,
but get 'topic does not exist' errors. This happens when:
  1. Producer creates topic (producer.go auto-creates via Produce request)
  2. Consumer requests metadata (Metadata request)
  3. Metadata handler checks TopicExists() with cached response (5s TTL)
  4. Cache returns false because it hasn't been refreshed yet
  5. Consumer receives 'topic does not exist' and fails

Solution: Add to ALL metadata handlers (v0-v4) what was already in v5-v8:
  1. Check if topic exists in cache
  2. If not, invalidate cache and query broker directly
  3. If broker doesn't have it either, AUTO-CREATE topic with defaults
  4. Return topic to consumer so it can subscribe

Changes:
  - HandleMetadataV0: Added cache invalidation + auto-creation
  - HandleMetadataV1: Added cache invalidation + auto-creation
  - HandleMetadataV2: Added cache invalidation + auto-creation
  - HandleMetadataV3V4: Added cache invalidation + auto-creation
  - HandleMetadataV5ToV8: Already had this logic

Result: Tests show 45% message consumption restored!
  - Produced: 3099, Consumed: 1381, Missing: 1718 (55%)
  - Zero errors, zero duplicates
  - Consumer throughput: 51.74 msgs/sec

Remaining 55% message loss likely due to:
  - Offset gaps on certain partitions (need to analyze gap patterns)
  - Early consumer exit or rebalancing issues
  - HWM calculation or fetch response boundaries

Next: Analyze detailed offset gap patterns to find where consumers stop
pull/7329/head
chrislu 4 days ago
parent
5d86a30d8e
commit
006c8ac47c
2 changed files with 98 additions and 8 deletions
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  1. 38
      test/kafka/kafka-client-loadtest/internal/consumer/consumer.go
  2. 68
      weed/mq/kafka/protocol/handler.go

38
test/kafka/kafka-client-loadtest/internal/consumer/consumer.go
View File

@ -7,6 +7,7 @@ import (
"fmt"
"log"
"os"
"strings"
"sync"
"time"
@ -627,6 +628,7 @@ func (h *ConsumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession,
initialOffset := claim.InitialOffset()
lastTrackedOffset := int64(-1)
gapCount := 0
var gaps []string // Track gap ranges for detailed analysis
// Log the starting offset for this partition
log.Printf("Consumer %d: START consuming %s[%d] from offset %d (HWM=%d)",
@ -640,9 +642,14 @@ func (h *ConsumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession,
case message, ok := <-claim.Messages():
if !ok {
elapsed := time.Since(startTime)
log.Printf("Consumer %d: STOP consuming %s[%d] after %d messages (%.1f sec, %.1f msgs/sec, last offset=%d, total gaps=%d)",
// Log detailed gap analysis
gapSummary := "none"
if len(gaps) > 0 {
gapSummary = fmt.Sprintf("[%s]", strings.Join(gaps, ", "))
}
log.Printf("Consumer %d: STOP consuming %s[%d] after %d messages (%.1f sec, %.1f msgs/sec, last offset=%d, total gaps=%d %s)",
h.consumer.id, topic, partition, msgCount, elapsed.Seconds(),
float64(msgCount)/elapsed.Seconds(), claim.HighWaterMarkOffset()-1, gapCount)
float64(msgCount)/elapsed.Seconds(), claim.HighWaterMarkOffset()-1, gapCount, gapSummary)
return nil
}
msgCount++
@ -651,8 +658,11 @@ func (h *ConsumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession,
if lastTrackedOffset >= 0 && message.Offset != lastTrackedOffset+1 {
gap := message.Offset - lastTrackedOffset - 1
gapCount++
log.Printf("Consumer %d: DEBUG offset gap in %s[%d]: offset %d -> %d (gap=%d messages)",
h.consumer.id, topic, partition, lastTrackedOffset, message.Offset, gap)
gapDesc := fmt.Sprintf("%d-%d", lastTrackedOffset+1, message.Offset-1)
gaps = append(gaps, gapDesc)
elapsed := time.Since(startTime)
log.Printf("Consumer %d: DEBUG offset gap in %s[%d] at %.1fs: offset %d -> %d (gap=%d messages, gapDesc=%s)",
h.consumer.id, topic, partition, elapsed.Seconds(), lastTrackedOffset, message.Offset, gap, gapDesc)
}
lastTrackedOffset = message.Offset
@ -704,10 +714,22 @@ func (h *ConsumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession,
case <-session.Context().Done():
elapsed := time.Since(startTime)
log.Printf("Consumer %d: Session context cancelled for %s[%d], committing final offsets (consumed %d messages in %.1f sec, last offset=%d)",
h.consumer.id, claim.Topic(), claim.Partition(), msgCount, elapsed.Seconds(), claim.HighWaterMarkOffset()-1)
// Commit all remaining marked offsets before shutting down
session.Commit()
lastOffset := claim.HighWaterMarkOffset() - 1
gapSummary := "none"
if len(gaps) > 0 {
gapSummary = fmt.Sprintf("[%s]", strings.Join(gaps, ", "))
}
// Determine if we reached HWM
reachedHWM := lastTrackedOffset >= (claim.HighWaterMarkOffset() - 1)
hwmStatus := "INCOMPLETE"
if reachedHWM {
hwmStatus = "COMPLETE"
}
log.Printf("Consumer %d: Context CANCELLED for %s[%d] after %d messages (%.1f sec, %.1f msgs/sec, last offset=%d, HWM=%d, status=%s, gaps=%d %s)",
h.consumer.id, topic, partition, msgCount, elapsed.Seconds(),
float64(msgCount)/elapsed.Seconds(), lastTrackedOffset, claim.HighWaterMarkOffset()-1, hwmStatus, gapCount, gapSummary)
return nil
}
}

68
weed/mq/kafka/protocol/handler.go
View File

@ -1270,6 +1270,26 @@ func (h *Handler) HandleMetadataV0(correlationID uint32, requestBody []byte) ([]
for _, name := range requestedTopics {
if h.seaweedMQHandler.TopicExists(name) {
topicsToReturn = append(topicsToReturn, name)
} else {
// Topic doesn't exist according to current cache, check broker directly
// This handles the race condition where producers just created topics
// and consumers are requesting metadata before cache TTL expires
glog.V(3).Infof("[METADATA v0] Topic %s not in cache, checking broker directly", name)
h.seaweedMQHandler.InvalidateTopicExistsCache(name)
if h.seaweedMQHandler.TopicExists(name) {
glog.V(3).Infof("[METADATA v0] Topic %s found on broker after cache refresh", name)
topicsToReturn = append(topicsToReturn, name)
} else {
glog.V(3).Infof("[METADATA v0] Topic %s not found, auto-creating with default partitions", name)
// Auto-create topic (matches Kafka's auto.create.topics.enable=true)
if err := h.createTopicWithSchemaSupport(name, h.GetDefaultPartitions()); err != nil {
glog.V(2).Infof("[METADATA v0] Failed to auto-create topic %s: %v", name, err)
// Don't add to topicsToReturn - client will get error
} else {
glog.V(2).Infof("[METADATA v0] Successfully auto-created topic %s", name)
topicsToReturn = append(topicsToReturn, name)
}
}
}
}
}
@ -1345,6 +1365,22 @@ func (h *Handler) HandleMetadataV1(correlationID uint32, requestBody []byte) ([]
for _, name := range requestedTopics {
if h.seaweedMQHandler.TopicExists(name) {
topicsToReturn = append(topicsToReturn, name)
} else {
// Topic doesn't exist according to current cache, check broker directly
glog.V(3).Infof("[METADATA v1] Topic %s not in cache, checking broker directly", name)
h.seaweedMQHandler.InvalidateTopicExistsCache(name)
if h.seaweedMQHandler.TopicExists(name) {
glog.V(3).Infof("[METADATA v1] Topic %s found on broker after cache refresh", name)
topicsToReturn = append(topicsToReturn, name)
} else {
glog.V(3).Infof("[METADATA v1] Topic %s not found, auto-creating with default partitions", name)
if err := h.createTopicWithSchemaSupport(name, h.GetDefaultPartitions()); err != nil {
glog.V(2).Infof("[METADATA v1] Failed to auto-create topic %s: %v", name, err)
} else {
glog.V(2).Infof("[METADATA v1] Successfully auto-created topic %s", name)
topicsToReturn = append(topicsToReturn, name)
}
}
}
}
}
@ -1463,6 +1499,22 @@ func (h *Handler) HandleMetadataV2(correlationID uint32, requestBody []byte) ([]
for _, name := range requestedTopics {
if h.seaweedMQHandler.TopicExists(name) {
topicsToReturn = append(topicsToReturn, name)
} else {
// Topic doesn't exist according to current cache, check broker directly
glog.V(3).Infof("[METADATA v2] Topic %s not in cache, checking broker directly", name)
h.seaweedMQHandler.InvalidateTopicExistsCache(name)
if h.seaweedMQHandler.TopicExists(name) {
glog.V(3).Infof("[METADATA v2] Topic %s found on broker after cache refresh", name)
topicsToReturn = append(topicsToReturn, name)
} else {
glog.V(3).Infof("[METADATA v2] Topic %s not found, auto-creating with default partitions", name)
if err := h.createTopicWithSchemaSupport(name, h.GetDefaultPartitions()); err != nil {
glog.V(2).Infof("[METADATA v2] Failed to auto-create topic %s: %v", name, err)
} else {
glog.V(2).Infof("[METADATA v2] Successfully auto-created topic %s", name)
topicsToReturn = append(topicsToReturn, name)
}
}
}
}
}
@ -1571,6 +1623,22 @@ func (h *Handler) HandleMetadataV3V4(correlationID uint32, requestBody []byte) (
for _, name := range requestedTopics {
if h.seaweedMQHandler.TopicExists(name) {
topicsToReturn = append(topicsToReturn, name)
} else {
// Topic doesn't exist according to current cache, check broker directly
glog.V(3).Infof("[METADATA v3/v4] Topic %s not in cache, checking broker directly", name)
h.seaweedMQHandler.InvalidateTopicExistsCache(name)
if h.seaweedMQHandler.TopicExists(name) {
glog.V(3).Infof("[METADATA v3/v4] Topic %s found on broker after cache refresh", name)
topicsToReturn = append(topicsToReturn, name)
} else {
glog.V(3).Infof("[METADATA v3/v4] Topic %s not found, auto-creating with default partitions", name)
if err := h.createTopicWithSchemaSupport(name, h.GetDefaultPartitions()); err != nil {
glog.V(2).Infof("[METADATA v3/v4] Failed to auto-create topic %s: %v", name, err)
} else {
glog.V(2).Infof("[METADATA v3/v4] Successfully auto-created topic %s", name)
topicsToReturn = append(topicsToReturn, name)
}
}
}
}
}

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