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Posted to issues@spark.apache.org by "EdisonWang (Jira)" <ji...@apache.org> on 2019/11/15 16:59:00 UTC

[jira] [Created] (SPARK-29918) RecordBinaryComparator should check endianness when compared by long

EdisonWang created SPARK-29918:
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             Summary: RecordBinaryComparator should check endianness when compared by long
                 Key: SPARK-29918
                 URL: https://issues.apache.org/jira/browse/SPARK-29918
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: EdisonWang


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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