[jira] [Commented] (SPARK-7124) Add functions to check for file and directory existence

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-7124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14511387#comment-14511387 ] 

Sean Owen commented on SPARK-7124:
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There is already an HDFS API for this, which also works for local files.

> Add functions to check for file and directory existence
> -------------------------------------------------------
>
>                 Key: SPARK-7124
>                 URL: https://issues.apache.org/jira/browse/SPARK-7124
>             Project: Spark
>          Issue Type: Improvement
>          Components: Input/Output
>            Reporter: Sam Steingold
>
> How do I check that a file or directory exists?
> For file, I was told to do {{sc.textFile().first()}} which seems wrong:
> # it initiates unnecessary i/o which could be huge (what is the file is binary and has no newlines?)
> # it fails for 0-length files (e.g., we write 0-length {{_SUCCESS}} files in directories after they have been successfully written)
> it appears that Spark needs bona file {{isFile}} and {{isDirectory}} methods.



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