[jira] [Updated] (SPARK-28854) Zipping iterators in mapPartitions will fail

2019-08-23 Thread Hyukjin Kwon (Jira) 


 [ 
https://issues.apache.org/jira/browse/SPARK-28854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Hyukjin Kwon updated SPARK-28854:
-
Description: 
{code}
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
xs.map(2*).zip(xs)).collect.foreach(println)

...

java.util.NoSuchElementException: next on empty iterator
{code}

 

 

Workaround - implement zip with mapping to tuple:

{code}
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
x))).collect.foreach(println)
(2,1)
(4,2)
(6,3)
{code}

 

  was:
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
xs.map(2*).zip(xs)).collect.foreach(println)

warning: there was one feature warning; re-run with -feature for details

19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)

java.util.NoSuchElementException: next on empty iterator

 

 

Workaround - implement zip with mapping to tuple:

scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
x))).collect.foreach(println)

(2,1)

(4,2)

(6,3)

 


> Zipping iterators in mapPartitions will fail
> 
>
> Key: SPARK-28854
> URL: https://issues.apache.org/jira/browse/SPARK-28854
> Project: Spark
>  Issue Type: Bug
>  Components: Spark Core
>Affects Versions: 2.4.3
>Reporter: Hao Yang Ang
>Priority: Minor
>
> {code}
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
> xs.map(2*).zip(xs)).collect.foreach(println)
> ...
> java.util.NoSuchElementException: next on empty iterator
> {code}
>  
>  
> Workaround - implement zip with mapping to tuple:
> {code}
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
> x))).collect.foreach(println)
> (2,1)
> (4,2)
> (6,3)
> {code}
>  



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[jira] [Updated] (SPARK-28854) Zipping iterators in mapPartitions will fail

2019-08-22 Thread Hao Yang Ang (Jira) 


 [ 
https://issues.apache.org/jira/browse/SPARK-28854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Hao Yang Ang updated SPARK-28854:
-
Description: 
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
xs.map(2*).zip(xs)).collect.foreach(println)

warning: there was one feature warning; re-run with -feature for details

19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)

java.util.NoSuchElementException: next on empty iterator

 

 

Workaround - implement zip with mapping to tuple:

scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
x))).collect.foreach(println)

(2,1)

(4,2)

(6,3)

 

  was:
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
xs.map(2*).zip(xs)).foreach(println)

warning: there was one feature warning; re-run with -feature for details

19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)

java.util.NoSuchElementException: next on empty iterator

 

 

Workaround - implement zip with mapping to tuple:

scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
x))).collect.foreach(println)

(2,1)

(4,2)

(6,3)

 


> Zipping iterators in mapPartitions will fail
> 
>
> Key: SPARK-28854
> URL: https://issues.apache.org/jira/browse/SPARK-28854
> Project: Spark
>  Issue Type: Bug
>  Components: Spark Core
>Affects Versions: 2.4.3
>Reporter: Hao Yang Ang
>Priority: Minor
>
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
> xs.map(2*).zip(xs)).collect.foreach(println)
> warning: there was one feature warning; re-run with -feature for details
> 19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)
> java.util.NoSuchElementException: next on empty iterator
>  
>  
> Workaround - implement zip with mapping to tuple:
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
> x))).collect.foreach(println)
> (2,1)
> (4,2)
> (6,3)
>  



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[jira] [Updated] (SPARK-28854) Zipping iterators in mapPartitions will fail

2019-08-22 Thread Hao Yang Ang (Jira) 


 [ 
https://issues.apache.org/jira/browse/SPARK-28854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Hao Yang Ang updated SPARK-28854:
-
Description: 
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
xs.map(2*).zip(xs)).foreach(println)

warning: there was one feature warning; re-run with -feature for details

19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)

java.util.NoSuchElementException: next on empty iterator

 

 

Workaround - implement zip with mapping to tuple:

scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
x))).collect.foreach(println)

(2,1)

(4,2)

(6,3)

 

  was:
scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
xs.map(2*).zip(xs)).foreach(println)

warning: there was one feature warning; re-run with -feature for details

19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)

java.util.NoSuchElementException: next on empty iterator




Workaround - implement zip with mapping to tuple:


scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
x))).collect.foreach(println)

(2,1)

(4,2)

(6,3)





 


> Zipping iterators in mapPartitions will fail
> 
>
> Key: SPARK-28854
> URL: https://issues.apache.org/jira/browse/SPARK-28854
> Project: Spark
>  Issue Type: Bug
>  Components: Spark Core
>Affects Versions: 2.4.3
>Reporter: Hao Yang Ang
>Priority: Minor
>
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => 
> xs.map(2*).zip(xs)).foreach(println)
> warning: there was one feature warning; re-run with -feature for details
> 19/08/22 21:13:18 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)
> java.util.NoSuchElementException: next on empty iterator
>  
>  
> Workaround - implement zip with mapping to tuple:
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, 
> x))).collect.foreach(println)
> (2,1)
> (4,2)
> (6,3)
>  



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