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  1. Spark
  2. SPARK-29918

RecordBinaryComparator should check endianness when compared by long

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 3.0.0
    • Fix Version/s: 2.4.5, 3.0.0
    • Component/s: SQL
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      Description

      If the architecture supports unaligned or the offset is 8 bytes aligned, RecordBinaryComparator compare 8 bytes at a time by reading 8 bytes as a long. Otherwise, it will compare bytes by bytes. 

      However, on little-endian machine,  the result of compared by a long value and compared bytes by bytes maybe different. If the architectures in a yarn cluster is different(Some is unaligned-access capable while others not), then the sequence of two records after sorted is undetermined, which will result in the same problem as in https://issues.apache.org/jira/browse/SPARK-23207

       

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              • Assignee:
                EdisonWang EdisonWang
                Reporter:
                EdisonWang EdisonWang
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                • Created:
                  Updated:
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