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https://issues.apache.org/jira/browse/HIVE-12175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14956939#comment-14956939
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Xuefu Zhang commented on HIVE-12175:
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Is 3.0.x compatible with 2.22?. It might break Hive on Spark due to any
incompatibility issue. Thus, I think we need to be careful about this upgrade.
> Upgrade Kryo version to 3.0.x
> -----------------------------
>
> Key: HIVE-12175
> URL: https://issues.apache.org/jira/browse/HIVE-12175
> Project: Hive
> Issue Type: Improvement
> Components: Serializers/Deserializers
> Affects Versions: 2.0.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
>
> Current version of kryo (2.22) has some issue with serializing ArrayLists
> generated using Arrays.asList(). We need to either replace all occurrences of
> Arrays.asList() or change the current StdInstantiatorStrategy. This issue is
> fixed in later versions and kryo community recommends using
> DefaultInstantiatorStrategy with fallback to StdInstantiatorStrategy. More
> discussion about this issue is here
> https://github.com/EsotericSoftware/kryo/issues/216. Alternatively, custom
> serilization/deserilization class can be provided for Arrays.asList.
> Also, kryo 3.0 introduced unsafe based serialization which claims to have
> much better performance for certain types of serialization.
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