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

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

    [ https://issues.apache.org/jira/browse/SPARK-25069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16574543#comment-16574543 ] 

Apache Spark commented on SPARK-25069:
--------------------------------------

User 'eatoncys' has created a pull request for this issue:
https://github.com/apache/spark/pull/22053

> 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
>            Priority: Major
>
> 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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