Liang-Chi Hsieh created SPARK-18800:
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Summary: 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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