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https://issues.apache.org/jira/browse/SPARK-17569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514512#comment-15514512
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Apache Spark commented on SPARK-17569:
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User 'brkyvz' has created a pull request for this issue:
https://github.com/apache/spark/pull/15202
> Don't recheck existence of files when generating File Relation resolution in
> StructuredStreaming
> ------------------------------------------------------------------------------------------------
>
> Key: SPARK-17569
> URL: https://issues.apache.org/jira/browse/SPARK-17569
> Project: Spark
> Issue Type: Improvement
> Reporter: Burak Yavuz
> Assignee: Burak Yavuz
> Fix For: 2.1.0
>
>
> Structured Streaming's FileSource lists files to classify files as Offsets.
> Once this file list is committed to a metadata log for a batch, this file
> list is turned into a "Batch FileSource" Relation which acts as the source to
> the incremental execution.
> While this "Batch FileSource" Relation is resolved, we re-check that every
> single file exists on the Driver. It takes a horrible amount of time, and is
> a total waste. We can simply skip file existence during execution.
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