Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/5645#discussion_r172911926
--- Diff:
flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/typeutils/AvroSerializer.java
---
@@ -163,8 +224,19 @@ public T copy(T from, T reuse) {
@Override
public void copy(DataInputView source, DataOutputView target) throws
IOException {
- T value = deserialize(source);
- serialize(value, target);
+ if (CONCURRENT_ACCESS_CHECK) {
+ enterExclusiveThread();
+ }
+
+ try {
+ T value = deserialize(source);
--- End diff --
An alternative would be to do the following, but I would honestly not do
that. This is a heuristic anyways (otherwise we would need to use CAS on the
`currentThread` field).
```java
private void enterExclusiveThread() {
Thread previous = currentThread;
Thread thisThread = Thread.currentThread();
if (previous == null) {
reEntranceDepth = 1;
currentThread = thisThread;
}
else if (previous == thisThread) {
reEntranceDepth++;
}
else {
throw new IllegalStateException(
"Concurrent access to KryoSerializer. Thread 1:
" + thisThread.getName() +
" , Thread 2: " +
previous.getName());
}
}
private void exitExclusiveThread() {
if (--reEntranceDepth == 0) {
currentThread = null;
}
}
```
---
