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https://issues.apache.org/jira/browse/HIVE-12175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15023816#comment-15023816
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Ashutosh Chauhan commented on HIVE-12175:
-----------------------------------------
+1 LGTM.
I assume you want to do kryo.copy() & unsafe based serialization in subsequent
patches.
> 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
> Attachments: HIVE-12175.1.patch, HIVE-12175.2.patch,
> HIVE-12175.3.patch, HIVE-12175.3.patch, HIVE-12175.4.patch,
> HIVE-12175.5.patch, HIVE-12175.6.patch
>
>
> Current version of kryo (2.22) has some issue (refer exception below and in
> HIVE-12174) 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.
> Exception:
> {code}
> Caused by: java.lang.NullPointerException
> at java.util.Arrays$ArrayList.size(Arrays.java:2847)
> at java.util.AbstractList.add(AbstractList.java:108)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:112)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:694)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
> ... 57 more
> {code}
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