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From "Sahil Takiar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-19937) Intern fields in MapWork on deserialization
Date Tue, 24 Jul 2018 16:22:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-19937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554477#comment-16554477
] 

Sahil Takiar commented on HIVE-19937:
-------------------------------------

[~vihangk1] could you take a look?

> Intern fields in MapWork on deserialization
> -------------------------------------------
>
>                 Key: HIVE-19937
>                 URL: https://issues.apache.org/jira/browse/HIVE-19937
>             Project: Hive
>          Issue Type: Improvement
>          Components: Spark
>            Reporter: Sahil Takiar
>            Assignee: Sahil Takiar
>            Priority: Major
>         Attachments: HIVE-19937.1.patch, HIVE-19937.2.patch, HIVE-19937.3.patch, HIVE-19937.4.patch,
HIVE-19937.5.patch, post-patch-report.html, report.html
>
>
> When fixing HIVE-16395, we decided that each new Spark task should clone the {{JobConf}}
object to prevent any {{ConcurrentModificationException}} from being thrown. However, setting
this variable comes at a cost of storing a duplicate {{JobConf}} object for each Spark task.
These objects can take up a significant amount of memory, we should intern them so that Spark
tasks running in the same JVM don't store duplicate copies.



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