[jira] [Created] (FLINK-2983) Add StateLoader as an alternative to default KvState

["Gyula Fora (JIRA)" <ji...@apache.org>]

Gyula Fora created FLINK-2983:
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             Summary: Add StateLoader as an alternative to default KvState 
                 Key: FLINK-2983
                 URL: https://issues.apache.org/jira/browse/FLINK-2983
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Gyula Fora


To create key-value states the user currently needs to specify a default state value that will be returned on first access. Even though this support nulls for implementing the initialization logic this is not a clean solution.

I propose to allow the user to pass a StateLoader instance which would load the default state:

interface StateLoader<I, K,S>{
    S loadState(K key, I currentInput);
}

The default value implementation could also use the state loader logic where the stateloader would just return a copy of the given value on the loadState call.



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