Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/2781#discussion_r91083191
--- Diff:
flink-runtime/src/main/java/org/apache/flink/migration/runtime/checkpoint/KeyGroupState.java
---
@@ -0,0 +1,88 @@
+/*
+ * 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.migration.runtime.checkpoint;
+
+import org.apache.flink.migration.runtime.state.StateHandle;
+import org.apache.flink.migration.util.SerializedValue;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Serializable;
+
+/**
+ * Simple container class which contains the serialized state handle for a
key group.
+ *
+ * The key group state handle is kept in serialized form because it can
contain user code classes
+ * which might not be available on the JobManager.
+ */
+@Deprecated
+public class KeyGroupState implements Serializable {
+ private static final long serialVersionUID = -5926696455438467634L;
+
+ private static final Logger LOG =
LoggerFactory.getLogger(KeyGroupState.class);
+
+ private final SerializedValue<StateHandle<?>> keyGroupState;
+
+ private final long stateSize;
+
+ private final long duration;
+
+ public KeyGroupState(SerializedValue<StateHandle<?>> keyGroupState,
long stateSize, long duration) {
+ this.keyGroupState = keyGroupState;
+
+ this.stateSize = stateSize;
+
+ this.duration = duration;
+ }
+
+ public SerializedValue<StateHandle<?>> getKeyGroupState() {
+ return keyGroupState;
+ }
+
+ public long getDuration() {
+ return duration;
+ }
+
+ public long getStateSize() {
+ return stateSize;
+ }
+
+ public void discard(ClassLoader classLoader) throws Exception {
+ keyGroupState.deserializeValue(classLoader).discardState();
--- End diff --
Let's "deactivate" this method by throwing an
`UnsupportedOperationException`.
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