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https://issues.apache.org/jira/browse/FLINK-8995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16662491#comment-16662491
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ASF GitHub Bot commented on FLINK-8995:
---------------------------------------
tzulitai commented on a change in pull request #6909: [FLINK-8995][tests] Add
keyed state that uses custom stateful seriali…
URL: https://github.com/apache/flink/pull/6909#discussion_r227863415
##########
File path:
flink-end-to-end-tests/flink-datastream-allround-test/src/main/java/org/apache/flink/streaming/tests/artificialstate/StatefulComplexPayloadSerializer.java
##########
@@ -0,0 +1,169 @@
+/*
+ * 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.tests.artificialstate;
+
+import org.apache.flink.api.common.typeutils.CompatibilityResult;
+import org.apache.flink.api.common.typeutils.ParameterlessTypeSerializerConfig;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.common.typeutils.TypeSerializerConfigSnapshot;
+import org.apache.flink.api.java.typeutils.runtime.DataInputViewStream;
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.DataOutputView;
+import org.apache.flink.util.InstantiationUtil;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * A custom stateful serializer to test that serializers are not used
concurrently.
+ */
+public class StatefulComplexPayloadSerializer extends
TypeSerializer<ComplexPayload> {
+
+ private static final long serialVersionUID = 8766687317209282373L;
+
+ /** This holds the thread that currently has exclusive ownership over
the serializer. */
+ private final AtomicReference<Thread> currentOwnerThread;
+
+ public StatefulComplexPayloadSerializer() {
+ this.currentOwnerThread = new AtomicReference<>(null);
+ }
+
+ @Override
+ public boolean isImmutableType() {
+ return false;
+ }
+
+ @Override
+ public TypeSerializer<ComplexPayload> duplicate() {
+ return new StatefulComplexPayloadSerializer();
+ }
+
+ @Override
+ public ComplexPayload createInstance() {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public ComplexPayload copy(ComplexPayload from) {
+ try {
+ if (currentOwnerThread.compareAndSet(null,
Thread.currentThread())) {
+ return InstantiationUtil.deserializeObject(
+
InstantiationUtil.serializeObject(from),
Thread.currentThread().getContextClassLoader());
Review comment:
Can avoid multiple invocations on `Thread.currentThread()`:
```
Thread currentThread = Thread.currentThread();
if (currentOwnerThread.compareAndSet(null, currentThread)) {
return deserializeObject(serializeObject(from),
currentThread.getContextClassLoader());
}
```
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> Add a test operator with keyed state that uses custom, stateful serializer
> --------------------------------------------------------------------------
>
> Key: FLINK-8995
> URL: https://issues.apache.org/jira/browse/FLINK-8995
> Project: Flink
> Issue Type: Sub-task
> Components: Tests
> Affects Versions: 1.5.0
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> This test should figure out problems in places where multiple threads would
> share the same serializer instead of properly duplicating it.
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