Zakelly commented on PR #26187:
URL: https://github.com/apache/flink/pull/26187#issuecomment-2674544015

   Nope, I meant user read checkpoint or native savepoint made by RocksDB, and 
want to perform a stateful aggregation on those key-values using Hashmap. Thus 
they should set 'hashmap' in flink configuration, and put 'rocksdb' under 
connector's 'with'. 
   
   > If you would like to keep it what if we can make it optional? When defined 
then used, otherwise Flink config value used. WDYT?
   
   I'm OK with this.
   
   BTW, maybe we could consider note the state backend down in checkpoint's 
meta, for the convenience of further reading or verification during recovery. 


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