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https://issues.apache.org/jira/browse/CAMEL-24208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-24208.
---------------------------------
Fix Version/s: 4.22.0
Resolution: Duplicate
Is fixed by CAMEL-23994
> pollOnError=ERROR_HANDLER skips valid messages on other partitions due to
> SeekUtil bug
> --------------------------------------------------------------------------------------
>
> Key: CAMEL-24208
> URL: https://issues.apache.org/jira/browse/CAMEL-24208
> Project: Camel
> Issue Type: Bug
> Components: camel-kafka
> Affects Versions: 4.21.0
> Reporter: Joseph Tam
> Priority: Minor
> Fix For: 4.22.0
>
>
> *Bug Summary:*
> When `pollOnError` is set to `ERROR_HANDLER` (the default) and a consumer is
> assigned multiple partitions, a `RecordDeserializationException` on one
> partition causes `SeekUtil` to improperly increment the offset of _every_
> partition assigned to that consumer, silently skipping valid messages.
> *Technical Details:*
> If a `RecordDeserializationException` is thrown inside the `poll()` loop,
> `KafkaFetchRecords` catches it globally as an `Exception` and hardcodes the
> `partitionLastOffset` to `-1L`:
> {code:java}
> // KafkaFetchRecords.java
> catch (Exception e)
> { long partitionLastOffset = -1L;
> this.pollExceptionStrategy.handle(partitionLastOffset, e); }
>
> {code}
> It then delegates to `BridgeErrorStrategy.handle(long partitionLastOffset,
> Exception exception)`. Because `partitionLastOffset` is `-1L`,
> `BridgeErrorStrategy` passes `-1L` down to `SeekUtil.seekToNextOffset`.
> When `SeekUtil` receives `-1L`, it loses track of which partition actually
> failed. To recover, it iterates over `consumer.assignment()` (every single
> partition assigned to the consumer) and arbitrarily advances their fetch
> positions by 1:
> {code:java}
> // SeekUtil.java
> if (tps != null) {
> for (TopicPartition tp : tps)
> { long next = consumer.position(tp) + 1L; // ... consumer.seek(tp, next); }
> }
> {code}
> *Impact:*
> If a consumer thread owns multiple partitions (e.g., 4 consumers processing a
> topic with 16 partitions), a bad message on `Partition-0` will cause the
> consumer to seek past the bad message on `Partition-0`, but it will _also_
> advance the offset of `Partition-1`, `Partition-2`, and `Partition-3` by 1.
> If there were valid messages staged at the current offset of those other
> partitions, they are permanently skipped and lost without being processed.
> *Proposed Fix:*
> `BridgeErrorStrategy` (or `SeekUtil`) should intercept
> `RecordDeserializationException` (or similar exceptions that expose the
> partition) to extract the exact `TopicPartition` and offset provided by the
> Kafka client, and strictly seek _only_ that specific partition forward.
> For example, modifying `BridgeErrorStrategy`:
> {code:java}
> if (partitionLastOffset == -1L && exception instanceof
> RecordDeserializationException) {
> RecordDeserializationException rde = (RecordDeserializationException)
> exception;
> TopicPartition tp = rde.topicPartition();
> long offset = rde.offset();
> if (tp != null && offset >= 0)
> {
> this.consumer.seek(tp, offset + 1L); return; // skip calling
> SeekUtil.seekToNextOffset }
> }
> {code}
>
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