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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/09/16 23:06:20 UTC

[jira] [Commented] (SPARK-17569) Don't recheck existence of files when generating File Relation resolution in StructuredStreaming

    [ https://issues.apache.org/jira/browse/SPARK-17569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15497680#comment-15497680 ] 

Apache Spark commented on SPARK-17569:
--------------------------------------

User 'brkyvz' has created a pull request for this issue:
https://github.com/apache/spark/pull/15122

> 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
>
> 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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