Github user azagrebin commented on a diff in the pull request:
https://github.com/apache/flink/pull/6186#discussion_r197079917
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/ttl/TtlValue.java ---
@@ -0,0 +1,47 @@
+/*
+ * 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.ttl;
+
+import org.apache.flink.util.Preconditions;
+
+import java.io.Serializable;
+
+/**
+ * This class wraps user value of state with TTL.
+ *
+ * @param <T> Type of the user value of state with TTL
+ */
+class TtlValue<T> implements Serializable {
+ private final T userValue;
+ private final long expirationTimestamp;
--- End diff --
I think it is a bit out of score for this PR. I thought about this concern
but semantics of processing time is similar of real clock time and it does not
stop if job is stopped. There is also event time option with more control over
time. I would leave it for now. This is more about user migration of
checkpoints. We can add a comment/open question to design doc about it.
---
