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From "Prasanth Jayachandran (JIRA)" <>
Subject [jira] [Commented] (HIVE-12424) Make use of Kryo's Object-to-Object deep copy
Date Thu, 19 Nov 2015 23:31:11 GMT


Prasanth Jayachandran commented on HIVE-12424:

Yes. It is blocked on Kryo. So far no response from kryo community. I think we won't be able
to target 2.0.0. If anything changes I will update this bug.

> Make use of Kryo's Object-to-Object deep copy
> ---------------------------------------------
>                 Key: HIVE-12424
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Serializers/Deserializers
>    Affects Versions: 2.0.0
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
> Currently, plan serialization and operator tree serialization uses Object -> bytes
-> Object approach for deep copy. It also uses ByteArrayOutputStream as intermediate buffer
whose write method is synchronized. Similarly read from ByteArrayInputStream is also synchronized.
Also Utilities.clonePlan() creates a new HiveConf object that scans through conf directories
and adds site.xml which is an expensive operation. All these can be avoided using Kryo's Object
-> Object deep copy. 

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