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

    https://github.com/apache/flink/pull/5239#discussion_r169896622
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/state/DirectoryKeyedStateHandle.java
 ---
    @@ -0,0 +1,105 @@
    +/*
    + * 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 javax.annotation.Nonnull;
    +
    +/**
    + * This class is a keyed state handle based on a directory. It combines a 
{@link DirectoryStateHandle} and a
    + * {@link KeyGroupRange}.
    + */
    +public class DirectoryKeyedStateHandle implements KeyedStateHandle {
    +
    +   @Nonnull
    +   private final DirectoryStateHandle directoryStateHandle;
    +
    +   @Nonnull
    +   private final KeyGroupRange keyGroupRange;
    +
    +   public DirectoryKeyedStateHandle(
    +           @Nonnull DirectoryStateHandle directoryStateHandle,
    +           @Nonnull KeyGroupRange keyGroupRange) {
    +
    +           this.directoryStateHandle = directoryStateHandle;
    +           this.keyGroupRange = keyGroupRange;
    +   }
    +
    +   @Nonnull
    +   public DirectoryStateHandle getDirectoryStateHandle() {
    +           return directoryStateHandle;
    +   }
    +
    +   @Nonnull
    +   @Override
    +   public KeyGroupRange getKeyGroupRange() {
    +           return keyGroupRange;
    +   }
    +
    +   @Override
    +   public void discardState() throws Exception {
    +           directoryStateHandle.discardState();
    +   }
    +
    +   @Override
    +   public long getStateSize() {
    +           return directoryStateHandle.getStateSize();
    +   }
    +
    +   @Override
    +   public KeyedStateHandle getIntersection(KeyGroupRange keyGroupRange) {
    +           return 
keyGroupRange.getIntersection(keyGroupRange).getNumberOfKeyGroups() > 0 ? this 
: null;
    --- End diff --
    
     👍 


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