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https://issues.apache.org/jira/browse/FLINK-7623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212431#comment-16212431
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ASF GitHub Bot commented on FLINK-7623:
---------------------------------------
Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/4851#discussion_r145921058
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/AcknowledgeStreamMockEnvironment.java
---
@@ -0,0 +1,65 @@
+/*
+ * 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.streaming.runtime.tasks;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.testutils.OneShotLatch;
+import org.apache.flink.runtime.checkpoint.CheckpointMetrics;
+import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
+import org.apache.flink.runtime.operators.testutils.MockInputSplitProvider;
+
+/**
+ * Stream environment that allows to wait for checkpoint acknowledgement.
+ */
+class AcknowledgeStreamMockEnvironment extends StreamMockEnvironment {
--- End diff --
`RocksDBAsyncSnapshotTest` does something very similar in anonymous class
> Detecting whether an operator is restored doesn't work with chained state
> -------------------------------------------------------------------------
>
> Key: FLINK-7623
> URL: https://issues.apache.org/jira/browse/FLINK-7623
> Project: Flink
> Issue Type: Bug
> Components: DataStream API, State Backends, Checkpointing
> Affects Versions: 1.4.0, 1.3.2
> Reporter: Aljoscha Krettek
> Assignee: Piotr Nowojski
> Priority: Blocker
> Fix For: 1.4.0, 1.3.3
>
> Attachments: StreamingJob.java
>
>
> Originally reported on the ML:
> https://lists.apache.org/thread.html/22a2cf83de3107aa81a03a921325a191c29df8aa8676798fcd497199@%3Cuser.flink.apache.org%3E
> If we have a chain of operators where multiple of them have operator state,
> detection of the {{context.isRestored()}} flag (of {{CheckpointedFunction}})
> does not work correctly. It's best exemplified using this minimal example
> where both the source and the flatMap have state:
> {code}
> final StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> env
> .addSource(new MaSource()).uid("source-1")
> .flatMap(new MaFlatMap()).uid("flatMap-1");
> env.execute("testing");
> {code}
> If I do a savepoint with these UIDs, then change "source-1" to "source-2" and
> restore from the savepoint {{context.isRestored()}} still reports {{true}}
> for the source.
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