GJL commented on a change in pull request #9663: [WIP][FLINK-12433][runtime] 
Implement DefaultScheduler stub
URL: https://github.com/apache/flink/pull/9663#discussion_r323732826
 
 

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 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/LegacyScheduler.java
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 @@ -19,78 +19,24 @@
 
 package org.apache.flink.runtime.scheduler;
 
-import org.apache.flink.api.common.JobID;
-import org.apache.flink.api.common.restartstrategy.RestartStrategies;
 import org.apache.flink.api.common.time.Time;
-import org.apache.flink.configuration.CheckpointingOptions;
 import org.apache.flink.configuration.Configuration;
-import org.apache.flink.core.io.InputSplit;
-import org.apache.flink.queryablestate.KvStateID;
-import org.apache.flink.runtime.JobException;
-import org.apache.flink.runtime.accumulators.AccumulatorSnapshot;
 import org.apache.flink.runtime.blob.BlobWriter;
-import org.apache.flink.runtime.checkpoint.CheckpointCoordinator;
-import org.apache.flink.runtime.checkpoint.CheckpointMetrics;
 import org.apache.flink.runtime.checkpoint.CheckpointRecoveryFactory;
-import org.apache.flink.runtime.checkpoint.CompletedCheckpoint;
-import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
-import org.apache.flink.runtime.client.JobExecutionException;
-import org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor;
-import org.apache.flink.runtime.concurrent.FutureUtils;
-import org.apache.flink.runtime.execution.ExecutionState;
-import org.apache.flink.runtime.executiongraph.ArchivedExecutionGraph;
-import org.apache.flink.runtime.executiongraph.Execution;
-import org.apache.flink.runtime.executiongraph.ExecutionAttemptID;
 import org.apache.flink.runtime.executiongraph.ExecutionGraph;
-import org.apache.flink.runtime.executiongraph.ExecutionGraphBuilder;
-import org.apache.flink.runtime.executiongraph.ExecutionGraphException;
-import org.apache.flink.runtime.executiongraph.ExecutionJobVertex;
-import org.apache.flink.runtime.executiongraph.IntermediateResult;
-import org.apache.flink.runtime.executiongraph.JobStatusListener;
-import org.apache.flink.runtime.executiongraph.restart.RestartStrategy;
 import org.apache.flink.runtime.executiongraph.restart.RestartStrategyFactory;
-import 
org.apache.flink.runtime.executiongraph.restart.RestartStrategyResolving;
 import org.apache.flink.runtime.io.network.partition.PartitionTracker;
-import org.apache.flink.runtime.io.network.partition.ResultPartitionID;
-import org.apache.flink.runtime.jobgraph.IntermediateDataSetID;
 import org.apache.flink.runtime.jobgraph.JobGraph;
-import org.apache.flink.runtime.jobgraph.JobStatus;
-import org.apache.flink.runtime.jobgraph.JobVertexID;
-import org.apache.flink.runtime.jobgraph.SavepointRestoreSettings;
-import org.apache.flink.runtime.jobmanager.PartitionProducerDisposedException;
-import org.apache.flink.runtime.jobmaster.SerializedInputSplit;
 import org.apache.flink.runtime.jobmaster.slotpool.SlotProvider;
-import org.apache.flink.runtime.messages.FlinkJobNotFoundException;
-import org.apache.flink.runtime.messages.checkpoint.AcknowledgeCheckpoint;
-import org.apache.flink.runtime.messages.checkpoint.DeclineCheckpoint;
-import org.apache.flink.runtime.messages.webmonitor.JobDetails;
 import org.apache.flink.runtime.metrics.groups.JobManagerJobMetricGroup;
-import org.apache.flink.runtime.query.KvStateLocation;
-import org.apache.flink.runtime.query.KvStateLocationRegistry;
-import org.apache.flink.runtime.query.UnknownKvStateLocation;
 import 
org.apache.flink.runtime.rest.handler.legacy.backpressure.BackPressureStatsTracker;
-import 
org.apache.flink.runtime.rest.handler.legacy.backpressure.OperatorBackPressureStats;
 import org.apache.flink.runtime.shuffle.ShuffleMaster;
-import org.apache.flink.runtime.state.KeyGroupRange;
-import org.apache.flink.runtime.taskmanager.TaskExecutionState;
-import org.apache.flink.runtime.taskmanager.TaskManagerLocation;
-import org.apache.flink.runtime.webmonitor.WebMonitorUtils;
-import org.apache.flink.util.FlinkException;
-import org.apache.flink.util.InstantiationUtil;
-import org.apache.flink.util.function.FunctionUtils;
 
 import org.slf4j.Logger;
 
-import java.io.IOException;
-import java.net.InetSocketAddress;
-import java.util.Optional;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.CompletionException;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
 
-import static org.apache.flink.util.Preconditions.checkNotNull;
 
 Review comment:
   Cannot fix this without rebasing. I will probably squash all commits into 
one anyways. (except for hotfixes)

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