Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/2781#discussion_r91051952
--- Diff:
flink-runtime/src/main/java/org/apache/flink/migration/runtime/checkpoint/savepoint/SavepointV0.java
---
@@ -0,0 +1,102 @@
+/*
+ * 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.savepoint;
+
+import org.apache.flink.migration.runtime.checkpoint.TaskState;
+import org.apache.flink.runtime.checkpoint.savepoint.Savepoint;
+import org.apache.flink.util.Preconditions;
+
+import java.util.Collection;
+
+/**
+ * Savepoint version 0.
+ *
+ * <p>This format was introduced with Flink 1.1.0.
+ */
+public class SavepointV0 implements Savepoint {
+
+ /** The savepoint version. */
+ public static final int VERSION = 0;
+
+ /** The checkpoint ID */
+ private final long checkpointId;
+
+ /** The task states */
+ private final Collection<TaskState> taskStates;
+
+ public SavepointV0(long checkpointId, Collection<TaskState> taskStates)
{
+ this.checkpointId = checkpointId;
+ this.taskStates = Preconditions.checkNotNull(taskStates, "Task
States");
+ }
+
+ @Override
+ public int getVersion() {
+ return VERSION;
+ }
+
+ @Override
+ public long getCheckpointId() {
+ return checkpointId;
+ }
+
+ @Override
+ public Collection<org.apache.flink.runtime.checkpoint.TaskState>
getTaskStates() {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public void dispose() throws Exception {
+ ClassLoader cl = Thread.currentThread().getContextClassLoader();
--- End diff --
Do we ever expect someone to use the `SavepointV0` to dispose state? If
not, let's throw an `UnsupportedOperationException` here...
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