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From "Al M (JIRA)" <>
Subject [jira] [Commented] (SPARK-5270) Elegantly check if RDD is empty
Date Thu, 15 Jan 2015 17:28:36 GMT


Al M commented on SPARK-5270:

I just noticed that rdd.partitions.size is set to 0 for empty RDDs and > 0 for RDDs with
data; this is a far more elegant check than the others.

> Elegantly check if RDD is empty
> -------------------------------
>                 Key: SPARK-5270
>                 URL:
>             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:
> 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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