[jira] [Assigned] (HIVE-19937) Intern JobConf objects in Spark tasks

["Sahil Takiar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-19937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sahil Takiar reassigned HIVE-19937:
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> Intern JobConf objects in Spark tasks
> -------------------------------------
>
>                 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
>
> 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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