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https://issues.apache.org/jira/browse/SPARK-14551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15236478#comment-15236478
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Apache Spark commented on SPARK-14551:
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User 'rajeshbalamohan' has created a pull request for this issue:
https://github.com/apache/spark/pull/12319
> Reduce number of NN calls in OrcRelation with FileSourceStrategy mode
> ---------------------------------------------------------------------
>
> Key: SPARK-14551
> URL: https://issues.apache.org/jira/browse/SPARK-14551
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Rajesh Balamohan
> Priority: Minor
>
> When FileSourceStrategy is used, record reader is created which incurs a NN
> call internally. Later in OrcRelation.unwrapOrcStructs, it ends ups reading
> the file information to get the ObjectInspector. This incurs additional NN
> call. It would be good to avoid this additional NN call (specifically for
> partitioned datasets)
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