[jira] [Created] (FLINK-11287) RocksDBListState creation should use actual registered state serializer instead of serializer provided by descriptor

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-11287:
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             Summary: RocksDBListState creation should use actual registered state serializer instead of serializer provided by descriptor
                 Key: FLINK-11287
                 URL: https://issues.apache.org/jira/browse/FLINK-11287
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai
             Fix For: 1.8.0


Currently, when creating a {{RocksDBListState}}, the element serializer wrapped by the {{RocksDBListState}} is retrieved from the state descriptor:


{code}

static <E, K, N, SV, S extends State, IS extends S> IS create(
    StateDescriptor<S, SV> stateDesc,
    Tuple2<ColumnFamilyHandle, RegisteredKeyValueStateBackendMetaInfo<N, SV>> registerResult,
    RocksDBKeyedStateBackend<K> backend) {


    return (IS) new RocksDBListState<>(
        registerResult.f0,
        registerResult.f1.getNamespaceSerializer(),
        (TypeSerializer<List<E>>) registerResult.f1.getStateSerializer(),
        (List<E>) stateDesc.getDefaultValue(),
        backend);
}
{code}

This is incorrect, since new serializers retrieved from state descriptors have not been checked for compatibility with restored state.

Instead, the element serializer should be retrieved from the register result, which contains the actual state serializer registered in the state backend for state access (and has already been checked for compatibility / reconfigured appropriately).



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