[jira] [Commented] (HIVE-12424) Make use of Kryo's Object-to-Object deep copy

["Prasanth Jayachandran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007710#comment-15007710 ] 

Prasanth Jayachandran commented on HIVE-12424:
----------------------------------------------

This issue is currently blocked by https://github.com/EsotericSoftware/kryo/issues/148 which copies transient fields as well. maven jars has not reflected the changes yet.

> Make use of Kryo's Object-to-Object deep copy
> ---------------------------------------------
>
>                 Key: HIVE-12424
>                 URL: https://issues.apache.org/jira/browse/HIVE-12424
>             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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