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Subject [GitHub] StefanRRichter commented on a change in pull request #6875: [FLINK-9808] [state backends] Migrate state when necessary in state backends
Date Wed, 24 Oct 2018 12:02:32 GMT
StefanRRichter commented on a change in pull request #6875: [FLINK-9808] [state backends] Migrate
state when necessary in state backends
URL: https://github.com/apache/flink/pull/6875#discussion_r227757799
 
 

 ##########
 File path: flink-runtime/src/test/java/org/apache/flink/runtime/state/StateBackendMigrationTestBase.java
 ##########
 @@ -0,0 +1,780 @@
+/*
+ * 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;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.TypeSerializerSchemaCompatibility;
+import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
+import org.apache.flink.api.common.typeutils.base.IntSerializer;
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.DataOutputView;
+import org.apache.flink.runtime.checkpoint.CheckpointOptions;
+import org.apache.flink.runtime.checkpoint.StateObjectCollection;
+import org.apache.flink.runtime.execution.Environment;
+import org.apache.flink.runtime.operators.testutils.DummyEnvironment;
+import org.apache.flink.types.StringValue;
+import org.apache.flink.util.TestLogger;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.RunnableFuture;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests for the {@link KeyedStateBackend} and {@link OperatorStateBackend} as produced
+ * by various {@link StateBackend}s.
+ */
+@SuppressWarnings("serial")
+public abstract class StateBackendMigrationTestBase<B extends AbstractStateBackend>
extends TestLogger {
+
+	@Rule
+	public final ExpectedException expectedException = ExpectedException.none();
+
+	// lazily initialized stream storage
+	private CheckpointStorageLocation checkpointStorageLocation;
+
+	/**
+	 * Different "personalities" of {@link CustomStringSerializer}. Instead of creating
+	 * different classes we parameterize the serializer with this and
+	 * {@link CustomStringSerializerSnapshot} will instantiate serializers with the correct
+	 * personality.
+	 */
+	public enum SerializerVersion {
+		INITIAL,
+		RESTORE,
+		NEW
+	}
+
+	/**
+	 * The compatibility behaviour of {@link CustomStringSerializer}. This controls what
+	 * type of serializer {@link CustomStringSerializerSnapshot} will create for
+	 * the different methods that return/create serializers.
+	 */
+	public enum SerializerCompatibilityType {
+		COMPATIBLE_AS_IS,
+		REQUIRES_MIGRATION
+	}
+
+	/**
+	 * The serialization timeliness behaviour of the state backend under test.
+	 */
+	public enum BackendSerializationTimeliness {
+		ON_ACCESS,
+		ON_CHECKPOINTS
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	public void testValueStateWithSerializerRequiringMigration() throws Exception {
+		CustomStringSerializer.resetCountingMaps();
+
+		CheckpointStreamFactory streamFactory = createStreamFactory();
+		SharedStateRegistry sharedStateRegistry = new SharedStateRegistry();
+		AbstractKeyedStateBackend<Integer> backend = createKeyedBackend(IntSerializer.INSTANCE);
+
+		ValueStateDescriptor<String> kvId = new ValueStateDescriptor<>(
+			"id",
+			new CustomStringSerializer(SerializerCompatibilityType.COMPATIBLE_AS_IS, SerializerVersion.INITIAL));
+		ValueState<String> state = backend.getPartitionedState(VoidNamespace.INSTANCE, CustomVoidNamespaceSerializer.INSTANCE,
kvId);
+
+		// ============ Modifications to the state ============
+		//  For eager serialization backends:
+		//    This should result in serializer personality INITIAL having 2 serialize calls
+		//
+		//  For lazy serialization backends:
+		//    This should not result in any serialize / deserialize calls
+
+		backend.setCurrentKey(1);
+		state.update("1");
+		backend.setCurrentKey(2);
+		state.update("2");
+		backend.setCurrentKey(1);
+
+		if (getStateBackendSerializationTimeliness() == BackendSerializationTimeliness.ON_ACCESS)
{
+			assertEquals((Integer) 2, CustomStringSerializer.serializeCalled.get(SerializerVersion.INITIAL));
+			assertEquals(null, CustomStringSerializer.deserializeCalled.get(SerializerVersion.INITIAL));
 
 Review comment:
   Suggest to replace by `assertNull(...)`

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