dawidwys commented on a change in pull request #11622: 
[FLINK-16913][configuration, statebackend] Migrated StateBackends to use 
ReadableConfig instead of Configuration
URL: https://github.com/apache/flink/pull/11622#discussion_r402440578
 
 

 ##########
 File path: 
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBOptions.java
 ##########
 @@ -47,9 +48,10 @@
         * Choice of timer service implementation.
         */
        @Documentation.Section(Documentation.Sections.STATE_BACKEND_ROCKSDB)
-       public static final ConfigOption<String> TIMER_SERVICE_FACTORY = 
ConfigOptions
+       public static final ConfigOption<PriorityQueueStateType> 
TIMER_SERVICE_FACTORY = ConfigOptions
 
 Review comment:
   > I would not be too worried, though, because most users probably would not 
use this in code but rather in the yaml config.
   
   That was also my thinking after looking at it again. The class 
`RocksDBOptions` has no annotation, so it is not necessarily `Public`. Moreover 
I think we do not advertise using those options directly. Programatically users 
should rather use 
`org.apache.flink.contrib.streaming.state.RocksDBStateBackend#setPriorityQueueStateType`,
 if I am not mistaken.

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