ASF GitHub Bot commented on FLINK-8360:

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

    --- Diff: 
    @@ -0,0 +1,213 @@
    + * 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.streaming.runtime.tasks;
    +import org.apache.flink.api.common.ExecutionConfig;
    +import org.apache.flink.api.common.JobID;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.runtime.checkpoint.CheckpointMetaData;
    +import org.apache.flink.runtime.checkpoint.CheckpointMetrics;
    +import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
    +import org.apache.flink.runtime.checkpoint.StateObjectCollection;
    +import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
    +import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
    +import org.apache.flink.runtime.jobgraph.JobVertexID;
    +import org.apache.flink.runtime.jobgraph.OperatorID;
    +import org.apache.flink.runtime.operators.testutils.MockInputSplitProvider;
    +import org.apache.flink.runtime.state.DoneFuture;
    +import org.apache.flink.runtime.state.KeyedStateHandle;
    +import org.apache.flink.runtime.state.OperatorStateHandle;
    +import org.apache.flink.runtime.state.SnapshotResult;
    +import org.apache.flink.runtime.state.StateObject;
    +import org.apache.flink.runtime.state.TaskLocalStateStore;
    +import org.apache.flink.runtime.state.TaskStateManagerImpl;
    +import org.apache.flink.runtime.state.TestTaskStateManager;
    +import org.apache.flink.runtime.taskmanager.TestCheckpointResponder;
    +import org.apache.flink.streaming.api.operators.OperatorSnapshotFutures;
    +import org.junit.Assert;
    +import org.junit.Test;
    +import javax.annotation.Nonnull;
    +import javax.annotation.Nullable;
    +import java.util.HashMap;
    +import java.util.Map;
    +import java.util.concurrent.Future;
    +import java.util.concurrent.RunnableFuture;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +import static org.mockito.Mockito.mock;
    + * Test for forwarding of state reporting to and from {@link 
    + */
    +public class LocalStateForwardingTest {
    --- End diff --

> Implement task-local state recovery
> -----------------------------------
>                 Key: FLINK-8360
>                 URL: https://issues.apache.org/jira/browse/FLINK-8360
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Major
>             Fix For: 1.5.0
> This issue tracks the development of recovery from task-local state. The main 
> idea is to have a secondary, local copy of the checkpointed state, while 
> there is still a primary copy in DFS that we report to the checkpoint 
> coordinator.
> Recovery can attempt to restore from the secondary local copy, if available, 
> to save network bandwidth. This requires that the assignment from tasks to 
> slots is as sticky is possible.
> For starters, we will implement this feature for all managed keyed states and 
> can easily enhance it to all other state types (e.g. operator state) later.

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