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Posted to dev@hive.apache.org by "Sahil Takiar (JIRA)" <ji...@apache.org> on 2018/06/18 20:37:00 UTC

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

Sahil Takiar created HIVE-19937:
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             Summary: 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


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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