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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-5270) Elegantly check if RDD is empty
Date Fri, 16 Jan 2015 11:58:34 GMT

    [ https://issues.apache.org/jira/browse/SPARK-5270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280145#comment-14280145
] 

Sean Owen commented on SPARK-5270:
----------------------------------

I think it would be nice to have a utility method like this indeed since it can wrap up all
these options. Check for 0 partitions then check for first element. Mind if I make a PR?

> Elegantly check if RDD is empty
> -------------------------------
>
>                 Key: SPARK-5270
>                 URL: https://issues.apache.org/jira/browse/SPARK-5270
>             Project: Spark
>          Issue Type: Improvement
>    Affects Versions: 1.2.0
>         Environment: Centos 6
>            Reporter: Al M
>            Priority: Trivial
>
> Right now there is no clean way to check if an RDD is empty.  As discussed here: http://apache-spark-user-list.1001560.n3.nabble.com/Testing-if-an-RDD-is-empty-td1678.html#a1679
> I'd like a method rdd.isEmpty that returns a boolean.
> This would be especially useful when using streams.  Sometimes my batches are huge in
one stream, sometimes I get nothing for hours.  Still I have to run count() to check if there
is anything in the RDD.  I can process my empty RDD like the others but it would be more efficient
to just skip the empty ones.
> I can also run first() and catch the exception; this is neither a clean nor fast solution.



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