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https://issues.apache.org/jira/browse/FLINK-8679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372921#comment-16372921
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ASF GitHub Bot commented on FLINK-8679:
---------------------------------------

Github user sihuazhou commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5518#discussion_r169988602
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/state/KeyedStateBackend.java
 ---
    @@ -61,8 +61,9 @@
         *                 over it keys are not supported.
         * @param state State variable for which existing keys will be returned.
         * @param namespace Namespace for which existing keys will be returned.
    +    * @param namespaceSerializer the serializer for the namespace.
         */
    -   <N> Stream<K> getKeys(String state, N namespace);
    +   <N> Stream<K> getKeys(String state, N namespace, TypeSerializer<N> 
namespaceSerializer);
    --- End diff --
    
    Aha, I also noticed that `RegisteredKeyedBackendStateMetaInfo` contains the 
namespace serializer. But there is one thing that confuses me, I found that it 
looks like one `ColumnFamilyHandle` can correspond to multiple namespace 
serializer but I am not sure about this, so I introduced this additional 
parameter. Am I misunderstanding something? Can one `ColumnFamilyHandle` only 
correspond to one namespace serializer?


> RocksDBKeyedBackend.getKeys(stateName, namespace) doesn't filter data with 
> namespace
> ------------------------------------------------------------------------------------
>
>                 Key: FLINK-8679
>                 URL: https://issues.apache.org/jira/browse/FLINK-8679
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.5.0
>            Reporter: Sihua Zhou
>            Assignee: Sihua Zhou
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
> Currently, `RocksDBKeyedBackend.getKeys(stateName, namespace)` is odds. It 
> doesn't use the namespace to filter data. And 
> `HeapKeyedBackend.getKeys(stateName, namespace)` has done that, I think they 
> should be consistent at least.



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