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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12175) Upgrade Kryo version to 3.0.x
Date Wed, 11 Nov 2015 21:50:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15001184#comment-15001184
] 

Steve Loughran commented on HIVE-12175:
---------------------------------------

How traumatic is this update? They've been incompatible at the link level within the 2.x releases.



> 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
>
>
> 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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