[
https://issues.apache.org/jira/browse/FLINK-11654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780691#comment-16780691
]
Piotr Nowojski edited comment on FLINK-11654 at 2/28/19 4:16 PM:
-----------------------------------------------------------------
Adding a new unique configuration like {{TransactionIdSeed}} would increase
code complexity and I do not see any benefit for a user over setting operator
{{UID}}. Apart of the fact, that you can not change {{UID}} in a retrospection
without stop with savepoint (otherwise you would brake exactly once). So I
would be in favour of closing this issue and make the "workaround" official way
to handle this use case.
was (Author: pnowojski):
Adding a new unique configuration like {{TransactionIdSeed}} would increase
code complexity and I do not see any benefit for the user over setting operator
{{UID}} apart of the fact, that you can not change {{UID}} in a retrospection
without stop with savepoint (otherwise you would brake exactly once). So I
would be in favour of closing this issue and make the "workaround" official way
to handle this use case.
> Multiple transactional KafkaProducers writing to same cluster have clashing
> transaction IDs
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-11654
> URL: https://issues.apache.org/jira/browse/FLINK-11654
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.7.1
> Reporter: Jürgen Kreileder
> Priority: Major
> Fix For: 1.9.0
>
>
> We run multiple jobs on a cluster which write a lot to the same Kafka topic
> from identically named sinks. When EXACTLY_ONCE semantic is enabled for the
> KafkaProducers we run into a lot of ProducerFencedExceptions and all jobs go
> into a restart cycle.
> Example exception from the Kafka log:
>
> {code:java}
> [2019-02-18 18:05:28,485] ERROR [ReplicaManager broker=1] Error processing
> append operation on partition finding-commands-dev-1-0
> (kafka.server.ReplicaManager)
> org.apache.kafka.common.errors.ProducerFencedException: Producer's epoch is
> no longer valid. There is probably another producer with a newer epoch. 483
> (request epoch), 484 (server epoch)
> {code}
> The reason for this is the way FlinkKafkaProducer initializes the
> TransactionalIdsGenerator:
> The IDs are only guaranteed to be unique for a single Job. But they can clash
> between different Jobs (and Clusters).
>
>
> {code:java}
> ---
> a/flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java
> +++
> b/flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer.java
> @@ -819,6 +819,7 @@ public class FlinkKafkaProducer<IN>
> nextTransactionalIdHintState =
> context.getOperatorStateStore().getUnionListState(
> NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR);
> transactionalIdsGenerator = new TransactionalIdsGenerator(
> + // the prefix probably should include job id and maybe cluster id
> getRuntimeContext().getTaskName() + "-" +
> ((StreamingRuntimeContext) getRuntimeContext()).getOperatorUniqueID(),
> getRuntimeContext().getIndexOfThisSubtask(),
>
> getRuntimeContext().getNumberOfParallelSubtasks(),{code}
>
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
