Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1153#discussion_r41527148
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CompletedCheckpointStore.java
---
@@ -0,0 +1,76 @@
+/*
+ * 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.checkpoint;
+
+import java.util.List;
+
+/**
+ * A bounded LIFO-queue of {@link CompletedCheckpoint} instances.
+ */
+public interface CompletedCheckpointStore {
+
+ /**
+ * Recover available {@link CompletedCheckpoint} instances.
+ *
+ * <p>After a call to this method, {@link #getLatestCheckpoint()}
returns the latest
+ * available checkpoint.
+ */
+ void recover() throws Exception;
+
+ /**
+ * Returns the next checkpoint ID to use.
+ *
+ * @return The next checkpoint ID.
+ */
+ int getNextCheckpointID() throws Exception;
--- End diff --
Maybe add that this is the starting checkpoint ID value for the
`CheckpointCoordinator` which maintains its own counter which it also
increments. Thus, this method is only called once when the
`CheckpointCoordinator` is initiated.
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