Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/5239#discussion_r162583721
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/TaskStateManager.java
---
@@ -0,0 +1,62 @@
+/*
+ * 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.CheckpointMetaData;
+import org.apache.flink.runtime.checkpoint.CheckpointMetrics;
+import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
+import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * This interface provides methods to report and retrieve state for a task.
+ *
+ * <p>When a checkpoint or savepoint is triggered on a task, it will
create snapshots for all stream operator instances
+ * it owns. All operator snapshots from the task are then reported via
this interface. A typical implementation will
+ * dispatch and forward the reported state information to interested
parties such as the checkpoint coordinator or a
+ * local state store.
+ *
+ * <p>This interface also offers the complementary method that provides
access to previously saved state of operator
+ * instances in the task for restore purposes.
+ */
+public interface TaskStateManager extends CheckpointListener {
--- End diff --
I prefer to keep it as is for the reasons we discussed offline.
---
