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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