Zhihua Deng created HIVE-27596:
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Summary: Make the cached InputFormat stateless
Key: HIVE-27596
URL: https://issues.apache.org/jira/browse/HIVE-27596
Project: Hive
Issue Type: Improvement
Reporter: Zhihua Deng
InputFormat is cached in FetchOperator:
[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/FetchOperator.java#L233|https://github.com/ganeshashree/hive/blob/c2fb5827761b99b1270582bd9c41c9ab5a6ab549/ql/src/java/org/apache/hadoop/hive/ql/exec/FetchOperator.java#L233]
and HiveFileInputFormat:
[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/HiveInputFormat.java#L391]
which makes the InputFormat instance is accessible across different sessions,
so it's better to be stateless to avoid concurrency problem.
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