azagrebin commented on a change in pull request #7288: [FLINK-9702] Improvement 
in (de)serialization of keys and values for RocksDB state
URL: https://github.com/apache/flink/pull/7288#discussion_r241709684
 
 

 ##########
 File path: 
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/AbstractRocksDBState.java
 ##########
 @@ -129,30 +126,78 @@ public void setCurrentNamespace(N namespace) {
                        final TypeSerializer<N> safeNamespaceSerializer,
                        final TypeSerializer<V> safeValueSerializer) throws 
Exception {
 
-               Preconditions.checkNotNull(serializedKeyAndNamespace);
 
 Review comment:
   also here @nonnull for function args?

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