Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/4851#discussion_r145878649
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/tasks/RestoreStreamTaskTest.java
---
@@ -0,0 +1,325 @@
+/*
+ * 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.state.ListState;
+import org.apache.flink.api.common.state.ListStateDescriptor;
+import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
+import org.apache.flink.api.common.typeutils.base.LongSerializer;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.runtime.checkpoint.CheckpointMetaData;
+import org.apache.flink.runtime.checkpoint.CheckpointOptions;
+import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
+import org.apache.flink.runtime.checkpoint.StateAssignmentOperation;
+import org.apache.flink.runtime.checkpoint.TaskStateSnapshot;
+import org.apache.flink.runtime.jobgraph.OperatorID;
+import org.apache.flink.runtime.jobgraph.OperatorInstanceID;
+import org.apache.flink.runtime.operators.testutils.MockInputSplitProvider;
+import org.apache.flink.runtime.state.StateInitializationContext;
+import org.apache.flink.runtime.state.StateSnapshotContext;
+import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
+import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
+import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
+import org.apache.flink.streaming.util.TestHarnessUtil;
+import org.apache.flink.util.TestLogger;
+
+import org.junit.Test;
+
+import java.util.Collections;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests ensuring correct behaviour of {@link
org.apache.flink.runtime.state.ManagedInitializationContext#isRestored}
+ * method.
+ */
+public class RestoreStreamTaskTest extends TestLogger {
+ @Test
+ public void testRestore() throws Exception {
+ AcknowledgeStreamMockEnvironment environment1 = processRecords(
+ new OperatorID(42L, 42L),
+ new CounterOperator(),
+ new OperatorID(44L, 44L),
+ new CounterOperator(),
+ Optional.empty());
+
+ assertEquals(2,
environment1.getCheckpointStateHandles().getSubtaskStateMappings().size());
+
+ TaskStateSnapshot stateHandles =
environment1.getCheckpointStateHandles();
+
+ try {
+ AcknowledgeStreamMockEnvironment environment2 =
processRecords(
+ new OperatorID(42L, 42L),
+ new RestoreCounterOperator(),
+ new OperatorID(44L, 44L),
+ new RestoreCounterOperator(),
+ Optional.of(stateHandles));
+
+ assertEquals(2,
RestoreCounterOperator.RESTORE_COUNTER.get());
+ }
+ finally {
+ RestoreCounterOperator.RESTORE_COUNTER.getAndSet(0);
+ }
+ }
+
+ @Test
+ public void testRestoreWithNewId() throws Exception {
+ AcknowledgeStreamMockEnvironment environment1 = processRecords(
+ new OperatorID(42L, 42L),
+ new CounterOperator(),
+ new OperatorID(44L, 44L),
+ new CounterOperator(),
+ Optional.empty());
+
+ assertEquals(2,
environment1.getCheckpointStateHandles().getSubtaskStateMappings().size());
+
+ TaskStateSnapshot stateHandles =
environment1.getCheckpointStateHandles();
+
+ try {
+ AcknowledgeStreamMockEnvironment environment2 =
processRecords(
+ new OperatorID(4242L, 4242L),
+ new RestoreCounterOperator(),
+ new OperatorID(44L, 44L),
+ new RestoreCounterOperator(),
+ Optional.of(stateHandles));
+
+ assertEquals(1,
RestoreCounterOperator.RESTORE_COUNTER.get());
--- End diff --
Couldn't this also be interpreted in the exact opposite way because we
don't validate for which of the two operators we counted `isRestored == true`?
This be correct in connection with the other tests in this class, but i think
the invariant is not completely clear from only this test and it is not fully
self-contained.
---
