Github user StefanRRichter commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5239#discussion_r168180636
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/state/SnapshotStrategy.java
 ---
    @@ -0,0 +1,50 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + * http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.flink.runtime.state;
    +
    +import org.apache.flink.runtime.checkpoint.CheckpointOptions;
    +
    +import java.util.concurrent.RunnableFuture;
    +
    +/**
    + * Interface for different snapshot approaches in state backends. 
Implementing classes should ideally be stateless or at
    + * least threadsafe, i.e. this is a functional interface and is can be 
called in parallel by multiple checkpoints.
    + *
    + * @param <S> type of the returned state object that represents the result 
of the snapshot operation.
    + */
    +public interface SnapshotStrategy<S extends StateObject> {
    --- End diff --
    
    👍 


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