[jira] [Created] (FLINK-14875) Set Unmodifiable collection serializer of Kryo in Flink code

[Shang Yuanchun (Jira)]

Jing Zhang created FLINK-14875:
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             Summary: Set Unmodifiable collection serializer of Kryo in Flink code
                 Key: FLINK-14875
                 URL: https://issues.apache.org/jira/browse/FLINK-14875
             Project: Flink
          Issue Type: Bug
          Components: API / Type Serialization System
            Reporter: Jing Zhang
         Attachments: ImmutableCollectionKryoDeserializerITCase.java

If source contains data which has immutable collection, the exception will be thrown out:

{code:java}
Caused by: com.esotericsoftware.kryo.KryoException: java.lang.UnsupportedOperationException
Serialization trace:
logTags_ (com.aliyun.openservices.log.common.Logs$LogGroup)
mLogGroup (com.aliyun.openservices.log.common.LogGroupData)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125)
        at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
        at com.esotericsoftware.kryo.Kryo.readObjectOrNull(Kryo.java:730)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:113)
        at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
        at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
        at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.deserialize(KryoSerializer.java:315)
        at org.apache.flink.api.common.typeutils.base.ListSerializer.deserialize(ListSerializer.java:138)
        at org.apache.flink.api.common.typeutils.base.ListSerializer.deserialize(ListSerializer.java:47)
        at org.apache.flink.util.InstantiationUtil.deserializeFromByteArray(InstantiationUtil.java:463)
        at org.apache.flink.table.dataformat.BinaryRow.getGeneric(BinaryRow.java:440)
        at BaseRowSerializerProjection$52.apply(Unknown Source)
        at BaseRowSerializerProjection$52.apply(Unknown Source)
        at org.apache.flink.table.typeutils.BaseRowSerializer.baseRowToBinary(BaseRowSerializer.java:250)
        at org.apache.flink.table.typeutils.BaseRowSerializer.serializeToPages(BaseRowSerializer.java:285)
        at org.apache.flink.table.typeutils.BaseRowSerializer.serializeToPages(BaseRowSerializer.java:55)
        at org.apache.flink.table.runtime.sort.BinaryInMemorySortBuffer.write(BinaryInMemorySortBuffer.java:190)
        at org.apache.flink.table.runtime.sort.BinaryExternalSorter.write(BinaryExternalSorter.java:540)
        ... 10 more
Caused by: java.lang.UnsupportedOperationException
        at java.util.Collections$UnmodifiableCollection.add(Collections.java:1055)
        at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:109)
        at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:22)
        at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679)
        at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
        ... 27 more
{code}

the exception could also appears in a simple ITCase in attachments.

I find similar problems in [How to set Unmodifiable collection serializer of Kryo in Spark code|https://stackoverflow.com/questions/46818293/how-to-set-unmodifiable-collection-serializer-of-kryo-in-spark-code], however there is no way to set unmodifiable collection serializer of Kryo in Flink at present. Maybe we could take it into consideration.



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