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