zentol commented on issue #7061: [FLINK-10827][tests] Add test for duplicate() to SerializerTestBase URL: https://github.com/apache/flink/pull/7061#issuecomment-437292479 Related test-failure: ``` testDuplicate(org.apache.flink.api.java.typeutils.runtime.PojoSubclassSerializerTest) Time elapsed: 0.101 sec <<< ERROR! java.lang.IllegalStateException: Concurrent access to KryoSerializer. Thread 1: Thread-240 , Thread 2: Thread-241 at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.enterExclusiveThread(KryoSerializer.java:623) at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.copy(KryoSerializer.java:211) at org.apache.flink.api.java.typeutils.runtime.PojoSerializer.copy(PojoSerializer.java:256) at org.apache.flink.api.common.typeutils.SerializerTestBase$SerializerRunner.run(SerializerTestBase.java:597) ```
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