Nico Kruber created FLINK-7732:
----------------------------------
Summary: test instability in Kafa end-to-end test (invalid Kafka
offset)
Key: FLINK-7732
URL: https://issues.apache.org/jira/browse/FLINK-7732
Project: Flink
Issue Type: Bug
Components: Kafka Connector, Tests
Affects Versions: 1.4.0
Reporter: Nico Kruber
Priority: Critical
In a test run with unrelated changes in the network stack, the Kafa end-to-end
test was failing with an invalid offset:
{code}
2017-09-28 06:34:10,736 INFO org.apache.kafka.common.utils.AppInfoParser
- Kafka version : 0.10.2.1
2017-09-28 06:34:10,744 INFO org.apache.kafka.common.utils.AppInfoParser
- Kafka commitId : e89bffd6b2eff799
2017-09-28 06:34:14,549 INFO
org.apache.kafka.clients.consumer.internals.AbstractCoordinator - Discovered
coordinator testing-gce-f67551b8-8867-41c5-b36e-4196d0f11e30:9092 (id:
2147483647 rack: null) for group myconsumer.
2017-09-28 06:34:14,573 INFO
org.apache.kafka.clients.consumer.internals.AbstractCoordinator - Marking the
coordinator testing-gce-f67551b8-8867-41c5-b36e-4196d0f11e30:9092 (id:
2147483647 rack: null) dead for group myconsumer
2017-09-28 06:34:14,686 INFO
org.apache.kafka.clients.consumer.internals.AbstractCoordinator - Discovered
coordinator testing-gce-f67551b8-8867-41c5-b36e-4196d0f11e30:9092 (id:
2147483647 rack: null) for group myconsumer.
2017-09-28 06:34:14,687 INFO
org.apache.kafka.clients.consumer.internals.AbstractCoordinator - Marking the
coordinator testing-gce-f67551b8-8867-41c5-b36e-4196d0f11e30:9092 (id:
2147483647 rack: null) dead for group myconsumer
2017-09-28 06:34:14,792 INFO
org.apache.kafka.clients.consumer.internals.AbstractCoordinator - Discovered
coordinator testing-gce-f67551b8-8867-41c5-b36e-4196d0f11e30:9092 (id:
2147483647 rack: null) for group myconsumer.
2017-09-28 06:34:15,068 INFO
org.apache.flink.runtime.state.DefaultOperatorStateBackend -
DefaultOperatorStateBackend snapshot (In-Memory Stream Factory, synchronous
part) in thread Thread[Async calls on Source: Custom Source -> Map -> Sink:
Unnamed (1/1),5,Flink Task Threads] took 948 ms.
2017-09-28 06:34:15,164 WARN
org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher -
Committing offsets to Kafka failed. This does not compromise Flink's
checkpoints.
java.lang.IllegalArgumentException: Invalid offset: -915623761772
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.sendOffsetCommitRequest(ConsumerCoordinator.java:687)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.doCommitOffsetsAsync(ConsumerCoordinator.java:531)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.commitOffsetsAsync(ConsumerCoordinator.java:499)
at
org.apache.kafka.clients.consumer.KafkaConsumer.commitAsync(KafkaConsumer.java:1181)
at
org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.run(KafkaConsumerThread.java:217)
2017-09-28 06:34:15,171 ERROR
org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase - Async
Kafka commit failed.
java.lang.IllegalArgumentException: Invalid offset: -915623761772
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.sendOffsetCommitRequest(ConsumerCoordinator.java:687)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.doCommitOffsetsAsync(ConsumerCoordinator.java:531)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.commitOffsetsAsync(ConsumerCoordinator.java:499)
at
org.apache.kafka.clients.consumer.KafkaConsumer.commitAsync(KafkaConsumer.java:1181)
at
org.apache.flink.streaming.connectors.kafka.internal.KafkaConsumerThread.run(KafkaConsumerThread.java:217)
{code}
https://travis-ci.org/apache/flink/jobs/280722829
[~pnowojski] did a first analysis that revealed this:
In org/apache/flink/streaming/connectors/kafka/internal/Kafka09Fetcher.java:229
this is being sent:
{{long offsetToCommit = lastProcessedOffset + 1;}}
{{lastProcessedOffset}} comes from:
{{org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase#snapshotState}}
either lines 741 or 749
The value that we see is strangely similiar to
{{org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartitionStateSentinel#GROUP_OFFSET}}
{code}
/**
* Magic number that defines the partition should start from its committed
group offset in Kafka.
*
* <p>This is used as a placeholder so that the actual committed group
offset can be evaluated lazily
* when the partition will actually start to be read by the consumer.
*/
public static final long GROUP_OFFSET = -915623761773L;
{code}
This {{GROUP_OFFSET}} clearly was not intended to be committed, however
probably there is some race between this "lazy evaluation" and checkpoints
(which trigger committing offsets to kafka).
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