[ 
https://issues.apache.org/jira/browse/FLINK-19156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Dawid Wysakowicz updated FLINK-19156:
-------------------------------------
    Description: 
The code that checks if we should migrate the transaction id is as follows:

{code}
@Deprecated
private static final 
ListStateDescriptor<FlinkKafkaProducer.NextTransactionalIdHint> 
NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR =
        new ListStateDescriptor<>("next-transactional-id-hint", 
TypeInformation.of(NextTransactionalIdHint.class));

if 
(context.getOperatorStateStore().getRegisteredStateNames().contains(NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR))
 {
        migrateNextTransactionalIdHindState(context);
}
{code}

The condition in if statement is never met because it checks if a 
{{Set<String>}} contains object of type {{ListStateDescriptor}}

  was:
The code that checks if we should migrate the transaction id is as follows:

{code}
        @Deprecated
        private static final 
ListStateDescriptor<FlinkKafkaProducer.NextTransactionalIdHint> 
NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR =
                new ListStateDescriptor<>("next-transactional-id-hint", 
TypeInformation.of(NextTransactionalIdHint.class));

                if 
(context.getOperatorStateStore().getRegisteredStateNames().contains(NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR))
 {
                        migrateNextTransactionalIdHindState(context);
                }
{code}

The condition in if statement is never met because it checks if a 
{{Set<String>}} contains object of type {{ListStateDescriptor}}


> Migration of transactionIdHint in Kafka is never applied
> --------------------------------------------------------
>
>                 Key: FLINK-19156
>                 URL: https://issues.apache.org/jira/browse/FLINK-19156
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka
>    Affects Versions: 1.9.0
>            Reporter: Dawid Wysakowicz
>            Priority: Critical
>
> The code that checks if we should migrate the transaction id is as follows:
> {code}
> @Deprecated
> private static final 
> ListStateDescriptor<FlinkKafkaProducer.NextTransactionalIdHint> 
> NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR =
>       new ListStateDescriptor<>("next-transactional-id-hint", 
> TypeInformation.of(NextTransactionalIdHint.class));
> if 
> (context.getOperatorStateStore().getRegisteredStateNames().contains(NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR))
>  {
>       migrateNextTransactionalIdHindState(context);
> }
> {code}
> The condition in if statement is never met because it checks if a 
> {{Set<String>}} contains object of type {{ListStateDescriptor}}



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