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https://issues.apache.org/jira/browse/FLINK-22761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-22761:
-----------------------------------
      Labels: auto-deprioritized-major  (was: stale-major)
    Priority: Minor  (was: Major)

This issue was labeled "stale-major" 7 days ago and has not received any 
updates so it is being deprioritized. If this ticket is actually Major, please 
raise the priority and ask a committer to assign you the issue or revive the 
public discussion.


> Cannot remove POJO fields
> -------------------------
>
>                 Key: FLINK-22761
>                 URL: https://issues.apache.org/jira/browse/FLINK-22761
>             Project: Flink
>          Issue Type: Bug
>          Components: API / Type Serialization System
>    Affects Versions: 1.12.1
>            Reporter: Ygor Allan de Fraga
>            Priority: Minor
>              Labels: auto-deprioritized-major
>
> I tested a schema evolution in a state using POJO and no problem was found 
> when trying to add a new field, it was executed just fine. This same field 
> was removed from the POJO as it was just a test, but the application could 
> not restore the state due to an error.
>  
> Here is the error:
> {code:java}
> 2021-05-24 13:05:31,958 WARN  org.apache.flink.runtime.taskmanager.Task       
>              [] - Co-Flat Map -> Map (3/3)#464 
> (e0e6d41a18214eab0a1d3c089d8672de) switched from RUNNING to FAILED.2021-05-24 
> 13:05:31,958 WARN  org.apache.flink.runtime.taskmanager.Task                  
>   [] - Co-Flat Map -> Map (3/3)#464 (e0e6d41a18214eab0a1d3c089d8672de) 
> switched from RUNNING to FAILED.java.lang.Exception: Exception while creating 
> StreamOperatorStateContext. at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:254)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:272)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.runtime.tasks.OperatorChain.initializeStateAndOpenOperators(OperatorChain.java:425)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.lambda$beforeInvoke$2(StreamTask.java:535)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:50)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:525)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:565)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:755) 
> [zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.taskmanager.Task.run(Task.java:570) 
> [zdata-flink-streams.jar:0.1] at java.lang.Thread.run(Thread.java:748) 
> [?:1.8.0_282]
> Caused by: org.apache.flink.util.FlinkException: Could not restore keyed 
> state backend for CoStreamFlatMap_b101f370952ea85c2104e98dd54bf7f9_(3/3) from 
> any of the 1 provided restore options. at 
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:160)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:345)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:163)
>  ~[zdata-flink-streams.jar:0.1] ... 9 more
> Caused by: org.apache.flink.runtime.state.BackendBuildingException: Caught 
> unexpected exception. at 
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackendBuilder.build(RocksDBKeyedStateBackendBuilder.java:361)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:587)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:93)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:328)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:168)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:345)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:163)
>  ~[zdata-flink-streams.jar:0.1] ... 9 more
> Caused by: java.lang.NullPointerException at 
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.<init>(PojoSerializer.java:119)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.duplicate(PojoSerializer.java:184)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.duplicate(PojoSerializer.java:56)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.duplicate(PojoSerializer.java:170)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.duplicate(PojoSerializer.java:56)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.common.typeutils.CompositeSerializer$PrecomputedParameters.precompute(CompositeSerializer.java:239)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.common.typeutils.CompositeSerializer.<init>(CompositeSerializer.java:52)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.state.ttl.TtlStateFactory$TtlSerializer.<init>(TtlStateFactory.java:270)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.state.ttl.TtlStateFactory$TtlSerializerSnapshot.createOuterSerializerWithNestedSerializers(TtlStateFactory.java:387)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.state.ttl.TtlStateFactory$TtlSerializerSnapshot.createOuterSerializerWithNestedSerializers(TtlStateFactory.java:354)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.api.common.typeutils.CompositeTypeSerializerSnapshot.restoreSerializer(CompositeTypeSerializerSnapshot.java:218)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.state.StateSerializerProvider.previousSchemaSerializer(StateSerializerProvider.java:186)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.state.StateSerializerProvider.currentSchemaSerializer(StateSerializerProvider.java:161)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.runtime.state.RegisteredKeyValueStateBackendMetaInfo.getStateSerializer(RegisteredKeyValueStateBackendMetaInfo.java:143)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.ttl.RocksDbTtlCompactFiltersManager.setAndRegisterCompactFilterIfStateTtl(RocksDbTtlCompactFiltersManager.java:73)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBOperationUtils.createColumnFamilyDescriptor(RocksDBOperationUtils.java:167)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBOperationUtils.createStateInfo(RocksDBOperationUtils.java:144)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.restore.AbstractRocksDBRestoreOperation.getOrRegisterStateColumnFamilyHandle(AbstractRocksDBRestoreOperation.java:178)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.restore.RocksDBFullRestoreOperation.restoreKVStateMetaData(RocksDBFullRestoreOperation.java:186)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.restore.RocksDBFullRestoreOperation.restoreKeyGroupsInStateHandle(RocksDBFullRestoreOperation.java:157)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.restore.RocksDBFullRestoreOperation.restore(RocksDBFullRestoreOperation.java:142)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackendBuilder.build(RocksDBKeyedStateBackendBuilder.java:284)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:587)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:93)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:328)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:168)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:345)
>  ~[zdata-flink-streams.jar:0.1] at 
> org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:163)
>  ~[zdata-flink-streams.jar:0.1] ... 9 more{code}
>  
> A RocksDb state backend is being used along with valueState.



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