[jira] [Created] (SPARK-27164) RDD.countApprox on empty RDDs schedules jobs which never complete

["Ryan Moore (JIRA)" <ji...@apache.org>]

Ryan Moore created SPARK-27164:
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             Summary: RDD.countApprox on empty RDDs schedules jobs which never complete 
                 Key: SPARK-27164
                 URL: https://issues.apache.org/jira/browse/SPARK-27164
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.4.0, 2.2.3
         Environment: macOS, Spark-2.4.0 with Hadoop 2.7 running on Java 11.0.1

Also observed on:

macOS, Spark-2.2.3 with Hadoop 2.7 running on Java 1.8.0_151
            Reporter: Ryan Moore


When calling `countApprox` on an RDD which has no partitions (such as those created by `sparkContext.emptyRDD`) a job is scheduled with 0 stages and 0 tasks. That job appears under the "Active Jobs" in the Spark UI until it is either killed or the Spark context is shut down.

 
{code:java}
Using Scala version 2.11.12 (OpenJDK 64-Bit Server VM, Java 11.0.1)
Type in expressions to have them evaluated.
Type :help for more information.

scala> val ints = sc.makeRDD(Seq(1))
ints: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[0] at makeRDD at <console>:24

scala> ints.countApprox(1000)
res0: org.apache.spark.partial.PartialResult[org.apache.spark.partial.BoundedDouble] = (final: [1.000, 1.000])
// PartialResult is returned, Scheduled job completed

scala> ints.filter(_ => false).countApprox(1000)
res1: org.apache.spark.partial.PartialResult[org.apache.spark.partial.BoundedDouble] = (final: [0.000, 0.000])
// PartialResult is returned, Scheduled job completed

scala> sc.emptyRDD[Int].countApprox(1000)
res5: org.apache.spark.partial.PartialResult[org.apache.spark.partial.BoundedDouble] = (final: [0.000, 0.000])
// PartialResult is returned, Scheduled job is ACTIVE but never completes

scala> sc.union(Nil : Seq[org.apache.spark.rdd.RDD[Int]]).countApprox(1000)
res16: org.apache.spark.partial.PartialResult[org.apache.spark.partial.BoundedDouble] = (final: [0.000, 0.000])
// PartialResult is returned, Scheduled job is ACTIVE but never completes


{code}



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