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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/08/09 09:17:00 UTC
[jira] [Assigned] (SPARK-25069) Using UnsafeAlignedOffset to make
the entire record of 8 byte Items aligned like which is used in
UnsafeExternalSorter
[ https://issues.apache.org/jira/browse/SPARK-25069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-25069:
------------------------------------
Assignee: Apache Spark
> 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
> Assignee: Apache Spark
> 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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