[jira] [Created] (SPARK-25069) Using UnsafeAlignedOffset to make the entire record of 8 byte Items aligned like which is used in UnsafeExternalSorter

["eaton (JIRA)" <ji...@apache.org>]

eaton created SPARK-25069:
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             Summary: Using UnsafeAlignedOffset to make the entire record of 8 byte Items aligned like which is used in UnsafeExternalSorter 
                 Key: SPARK-25069
                 URL: https://issues.apache.org/jira/browse/SPARK-25069
             Project: Spark
          Issue Type: Improvement
          Components: Shuffle
    Affects Versions: 2.3.1
            Reporter: eaton


The class of UnsafeExternalSorter used UnsafeAlignedOffset to make the entire record of 8 byte Items aligned, but ShuffleExternalSorter not.
The SPARC platform requires this because using a 4 byte Int for record lengths causes the entire record of 8 byte Items to become misaligned by 4 bytes. Using a 8 byte long for record length keeps things 8 byte aligned.



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