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Posted to issues@flink.apache.org by "Konstantin Knauf (JIRA)" <ji...@apache.org> on 2018/09/17 10:50:00 UTC

[jira] [Updated] (FLINK-10353) Restoring a KafkaProducer with Semantic.EXACTLY_ONCE from a savepoint written with Semantic.AT_LEAST_ONCE fails with NPE

     [ https://issues.apache.org/jira/browse/FLINK-10353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Knauf updated FLINK-10353:
-------------------------------------
    Description: 
If a KafkaProducer with {{Semantic.EXACTLY_ONCE}} is restored from a savepoint written with {{Semantic.AT_LEAST_ONCE}} the job fails on restore with the NPE below. This makes it impossible to upgrade an AT_LEAST_ONCE pipeline to an EXACTL_ONCE pipeline statefully.

{quote}
java.lang.NullPointerException
	at java.util.Hashtable.put(Hashtable.java:460)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initTransactionalProducer(FlinkKafkaProducer011.java:955)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.recoverAndCommit(FlinkKafkaProducer011.java:733)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.recoverAndCommit(FlinkKafkaProducer011.java:93)
	at org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.recoverAndCommitInternal(TwoPhaseCommitSinkFunction.java:373)
	at org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.initializeState(TwoPhaseCommitSinkFunction.java:333)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initializeState(FlinkKafkaProducer011.java:867)
	at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
	at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:254)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
	at java.lang.Thread.run(Thread.java:748){quote}

The reason is, that for {{Semantic.AT_LEAST_ONCE}} the snapshotted state of the {{TwoPhaseCommitFunction}} is of the form "TransactionHolder\{handle=KafkaTransactionState [transactionalId=null, producerId=-1, epoch=-1], transactionStartTime=1537175471175}".




  was:
If a KafkaProducer with `Semantic.EXACTLY_ONCE` is restored from a savepoint written with `Semantic.AT_LEAST_ONCE` the job fails on restore with the NPE below. This makes it impossible to upgrade an AT_LEAST_ONCE pipeline to an EXACTL_ONCE pipeline statefully.

```
java.lang.NullPointerException
	at java.util.Hashtable.put(Hashtable.java:460)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initTransactionalProducer(FlinkKafkaProducer011.java:955)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.recoverAndCommit(FlinkKafkaProducer011.java:733)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.recoverAndCommit(FlinkKafkaProducer011.java:93)
	at org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.recoverAndCommitInternal(TwoPhaseCommitSinkFunction.java:373)
	at org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.initializeState(TwoPhaseCommitSinkFunction.java:333)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initializeState(FlinkKafkaProducer011.java:867)
	at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
	at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:254)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
	at java.lang.Thread.run(Thread.java:748)
```
The reason is, that for `Semantic.AT_LEAST_ONCE` the snapshotted state of the `TwoPhaseCommitFunction` is of the form 

```
TransactionHolder{handle=KafkaTransactionState [transactionalId=null, producerId=-1, epoch=-1], transactionStartTime=1537175471175}
```





> Restoring a KafkaProducer with Semantic.EXACTLY_ONCE from a savepoint written with Semantic.AT_LEAST_ONCE fails with NPE
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-10353
>                 URL: https://issues.apache.org/jira/browse/FLINK-10353
>             Project: Flink
>          Issue Type: Improvement
>          Components: Kafka Connector
>    Affects Versions: 1.5.3, 1.6.0
>            Reporter: Konstantin Knauf
>            Priority: Critical
>
> If a KafkaProducer with {{Semantic.EXACTLY_ONCE}} is restored from a savepoint written with {{Semantic.AT_LEAST_ONCE}} the job fails on restore with the NPE below. This makes it impossible to upgrade an AT_LEAST_ONCE pipeline to an EXACTL_ONCE pipeline statefully.
> {quote}
> java.lang.NullPointerException
> 	at java.util.Hashtable.put(Hashtable.java:460)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initTransactionalProducer(FlinkKafkaProducer011.java:955)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.recoverAndCommit(FlinkKafkaProducer011.java:733)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.recoverAndCommit(FlinkKafkaProducer011.java:93)
> 	at org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.recoverAndCommitInternal(TwoPhaseCommitSinkFunction.java:373)
> 	at org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.initializeState(TwoPhaseCommitSinkFunction.java:333)
> 	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initializeState(FlinkKafkaProducer011.java:867)
> 	at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
> 	at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
> 	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
> 	at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:254)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
> 	at java.lang.Thread.run(Thread.java:748){quote}
> The reason is, that for {{Semantic.AT_LEAST_ONCE}} the snapshotted state of the {{TwoPhaseCommitFunction}} is of the form "TransactionHolder\{handle=KafkaTransactionState [transactionalId=null, producerId=-1, epoch=-1], transactionStartTime=1537175471175}".



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