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Posted to issues@spark.apache.org by "EdisonWang (Jira)" <ji...@apache.org> on 2019/11/15 17:03:00 UTC
[jira] [Updated] (SPARK-29918) RecordBinaryComparator should check
endianness when compared by long
[ https://issues.apache.org/jira/browse/SPARK-29918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
EdisonWang updated SPARK-29918:
-------------------------------
Labels: correctness (was: )
> 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
> Priority: Minor
> Labels: correctness
>
> 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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