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https://issues.apache.org/jira/browse/SPARK-18800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15734680#comment-15734680
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Apache Spark commented on SPARK-18800:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/16232
> UnsafeInMemorySorter throws exception when used in UnsafeKVExternalSorter
> -------------------------------------------------------------------------
>
> Key: SPARK-18800
> URL: https://issues.apache.org/jira/browse/SPARK-18800
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> UnsafeKVExternalSorter uses UnsafeInMemorySorter to sort the records of
> BytesToBytesMap if it is given a map.
> Currently we use the number of keys in BytesToBytesMap to determine if the
> array used for sort is enough or not. It should be wrong. Because we can have
> multiple values of the same key. Extremely said, you can have
> BytesToBytesMap.numKeys() == 1, but BytesToBytesMap.numValues() is a big
> number.
> In this case, we cannot just use BytesToBytesMap's array to do sorting.
> Otherwise, a exception will be thrown like this:
> {code}
> [info] - SPARK-kv sorting with records already in BytesToBytesMap *** FAILED
> *** (61 milliseconds)
> [info] java.lang.IllegalStateException: There is no space for new record
> [info] at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.insertRecord(UnsafeInMemorySorter.jav
> a:225)
> [info] at
> org.apache.spark.sql.execution.UnsafeKVExternalSorter.<init>(UnsafeKVExternalSorter.java:147)
> {code}
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