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https://issues.apache.org/jira/browse/SPARK-14832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15253107#comment-15253107
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Apache Spark commented on SPARK-14832:
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User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/12591
> Refactor DataSource to ensure schema is inferred only once when creating a
> file stream
> --------------------------------------------------------------------------------------
>
> Key: SPARK-14832
> URL: https://issues.apache.org/jira/browse/SPARK-14832
> Project: Spark
> Issue Type: Sub-task
> Components: SQL, Streaming
> Reporter: Tathagata Das
> Assignee: Tathagata Das
>
> When creating a file stream using sqlContext.write.stream(), existing files
> are scanned twice for finding the schema
> - Once, when creating a DataSource + StreamingRelation in the
> DataFrameReader.stream()
> - Again, when creating streaming Source from the DataSource, in
> DataSource.createSource()
> Instead, the schema should be generated only once, at the time of creating
> the dataframe, and when the streaming source is created, it should just reuse
> that schema
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