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?
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