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https://issues.apache.org/jira/browse/SPARK-5270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278993#comment-14278993
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Sean Owen commented on SPARK-5270:
----------------------------------
I think it's conceivable to have an RDD with no elements but nonzero partitions
though. Witness:
{code}
val empty = sc.parallelize(Array[Int]())
empty.count
...
0
empty.partitions.size
...
8
{code}
> 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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