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

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.1
• Fix Version/s: 2.4.0
• Component/s: Shuffle, Spark Core
• Assignee: eaton
• Reporter: eaton
• Created: 09/Aug/18 09:13
• Updated: 17/May/20 18:31
• Resolved: 13/Aug/18 01:11

Description

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.

Issue Links

• links to: [Github] Pull Request #22053 (eatoncys)