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https://issues.apache.org/jira/browse/SPARK-7181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Qiping Li updated SPARK-7181:
-----------------------------
    Summary: External Sorter merge with aggregation go to an infinite loop when 
we have a total ordering  (was: External Sorter merge with aggregation go to an 
infinity loop when we have a total ordering)

> External Sorter merge with aggregation go to an infinite loop when we have a 
> total ordering
> -------------------------------------------------------------------------------------------
>
>                 Key: SPARK-7181
>                 URL: https://issues.apache.org/jira/browse/SPARK-7181
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.3.1
>            Reporter: Qiping Li
>            Priority: Critical
>             Fix For: 1.3.2, 1.4.0
>
>
> In the function {{mergeWithAggregation}} of {{ExternalSorter.scala}}, when 
> there is a total ordering for keys K, values of the same key in the sorted 
> iterator should be combined. Currently this is done by this:
> {code}
>   val elem = sorted.next()
>   val k = elem._1
>   var c = elem._2
>   while (sorted.hasNext && sorted.head._1 == k) {
>     c = mergeCombiners(c, sorted.head._2)
>   }
> {code}
> This will go to an infinity loop when there are more than 1 values with the 
> same key. `sorted.next()` should be called to fix this.



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