[jira] [Closed] (FLINK-3784) Unexpected results using collect() in RichMapPartitionFunction

["Sergio Ramírez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergio Ramírez closed FLINK-3784.
---------------------------------
    Resolution: Not A Problem

> Unexpected results using collect() in RichMapPartitionFunction
> --------------------------------------------------------------
>
>                 Key: FLINK-3784
>                 URL: https://issues.apache.org/jira/browse/FLINK-3784
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API, Machine Learning Library, Scala API
>    Affects Versions: 1.0.0
>         Environment: Debian 8.3
>            Reporter: Sergio Ramírez
>
> The following code (in Scala) outputs unexpected registers when it tries to transpose a simple matrix formed by LabeledVector. For each new key (feature, partition), a different number of registers is presented despite all new pairs should yield the same number of register as the data is dense (please, take a look to the result with a sample dataset). 
> def mapPartition(it: java.lang.Iterable[LabeledVector], out: Collector[((Int, Int), Int)]): Unit = {
>           val index = getRuntimeContext().getIndexOfThisSubtask() // Partition index
>           var ninst = 0
>           for(reg <- it.asScala) {
>             requireByteValues(reg.vector)
>             ninst += 1
>           }
>           for(i <- 0 until nFeatures) out.collect((i, index) -> ninst)
> }
> Result: 
> Attribute 10, first seven partitions: ((10,0),201),((10,1),200),((10,2),201),((10,3),200),((10,4),200),((10,5),201),((10,6),201),((10,7),201)
> Attribute 12, first seven partitions: ((12,0),201),((12,1),201),((12,2),201),((12,3),200),((12,4),201),((12,5),200),((12,6),200),((12,7),201) 



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