[jira] [Resolved] (SPARK-7125) textFile().first() on empty files raises ENOENT

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

     [ https://issues.apache.org/jira/browse/SPARK-7125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-7125.
------------------------------
    Resolution: Not A Problem

For a non-existent input, some flavor of "file not found exception" is correct, and this is the standard exception you would expect from Hadoop-related APIs. 

You don't get the same exception with an empty file, actually. It's "java.lang.UnsupportedOperationException: empty collection" This is consistent with, say {{Seq[Int]().head}} throwing the same. You can {{take(1)}} in this case, which returns _at most_ the desired number of elements, so would return an empty array for empty input.

> textFile().first() on empty files raises ENOENT
> -----------------------------------------------
>
>                 Key: SPARK-7125
>                 URL: https://issues.apache.org/jira/browse/SPARK-7125
>             Project: Spark
>          Issue Type: Bug
>            Reporter: Sam Steingold
>
> The two calls:
> # {{sc.textFile("existing-empty-file").first()}} and 
> # {{sc.textFile("non-existent-file").first()}} 
> raise the same exception:
> {{"org.apache.hadoop.mapred.InvalidInputException: Input path does not exist"}}
> The former should raise a different exception or return {{null}}.



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