UnsafeExternalSorter¶

Creating Instance¶

UnsafeExternalSorter takes the following to be created:

• [[taskMemoryManager]] memory:TaskMemoryManager.md[TaskMemoryManager]
• [[blockManager]] storage:BlockManager.md[BlockManager]
• <>
• [[taskContext]] TaskContext
• [[recordComparatorSupplier]] Supplier
• [[prefixComparator]] PrefixComparator
• [[initialSize]] Initial size
• [[pageSizeBytes]] Page size (in bytes)
• [[numElementsForSpillThreshold]] numElementsForSpillThreshold
• [[existingInMemorySorter]] memory:UnsafeInMemorySorter.md[UnsafeInMemorySorter]
• [[canUseRadixSort]] canUseRadixSort flag

== [[serializerManager]] SerializerManager

UnsafeExternalSorter is given a serializer:SerializerManager.md[SerializerManager] when <>.

UnsafeExternalSorter uses the SerializerManager for <>, <>, and (SpillableIterator) <> (to request UnsafeSorterSpillWriter for a memory:UnsafeSorterSpillWriter.md#getReader[UnsafeSorterSpillReader]).