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https://issues.apache.org/jira/browse/FLINK-9486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537061#comment-16537061
 ] 

ASF GitHub Bot commented on FLINK-9486:
---------------------------------------

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

    https://github.com/apache/flink/pull/6276#discussion_r201015258
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/state/TestPriorityQueueSetFactory.java
 ---
    @@ -0,0 +1,49 @@
    +/*
    + * 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.api.common.typeutils.TypeSerializer;
    +import org.apache.flink.runtime.state.heap.HeapPriorityQueueElement;
    +import org.apache.flink.runtime.state.heap.HeapPriorityQueueSet;
    +
    +import javax.annotation.Nonnull;
    +
    +import java.util.Comparator;
    +
    +/**
    + * Test implementation of a {@link PriorityQueueSetFactory}.
    + */
    +public class TestPriorityQueueSetFactory implements 
PriorityQueueSetFactory {
    +
    +   private final KeyGroupRange keyGroupRange;
    +   private final int totalkeyGroups;
    +
    +   public TestPriorityQueueSetFactory(KeyGroupRange keyGroupRange, int 
totalKeyGroups) {
    +           this.keyGroupRange = keyGroupRange;
    +           this.totalkeyGroups = totalKeyGroups;
    +   }
    +
    +   @Override
    +   public <T extends HeapPriorityQueueElement> 
KeyGroupedInternalPriorityQueue<T> create(
    +           @Nonnull String stateName,
    +           @Nonnull TypeSerializer<T> byteOrderedElementSerializer,
    +           @Nonnull Comparator<T> elementComparator,
    +           @Nonnull KeyExtractorFunction<T> keyExtractor) {
    --- End diff --
    
    Please indent one level more


> Introduce TimerState in keyed state backend
> -------------------------------------------
>
>                 Key: FLINK-9486
>                 URL: https://issues.apache.org/jira/browse/FLINK-9486
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.0
>
>
> This is the first implementation subtask.
> Goal of this PR is to introduce a timer state that is registered with the 
> keyed state backend, similar to other forms of keyed state.
> For the {{HeapKeyedStateBackend}}, this state lives on the same level as the 
> {{StateTable}} that hold other forms of keyed state, and the implementation 
> is basically backed by {{InternalTimerHeap}}.
> For {{RocksDBKeyedStateBackend}}, in this first step, we also introduce this 
> state, outside of RocksDB and based upon {{InternalTimerHeap}}. This is an 
> intermediate state, and we will later also implement the alternative to store 
> the timers inside a column families in RocksDB. However, by taking this step, 
> we could also still offer the option to have RocksDB state with heap-based 
> timers.



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