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https://issues.apache.org/jira/browse/SPARK-8125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14626456#comment-14626456
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Apache Spark commented on SPARK-8125:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/7396
> Accelerate ParquetRelation2 metadata discovery
> ----------------------------------------------
>
> Key: SPARK-8125
> URL: https://issues.apache.org/jira/browse/SPARK-8125
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Priority: Blocker
>
> For large Parquet tables (e.g., with thousands of partitions), it can be very
> slow to discover Parquet metadata for schema merging and generating splits
> for Spark jobs. We need to accelerate this processes. One possible solution
> is to do the discovery via a distributed Spark job.
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