GitHub user eatoncys opened a pull request:
https://github.com/apache/spark/pull/22053
[SPARK-25069][Core]Using UnsafeAlignedOffset to make the entire record of 8
byte Items aligned like which is used in UnsafeExternalSorter
## What changes were proposed in this pull request?
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.
## How was this patch tested?
Existing Test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/eatoncys/spark UnsafeAlignedOffset
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22053.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #22053
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commit 8559c454127904ad2d25930d6b743238f0fff46d
Author: 10129659 <chen.yanshan@...>
Date: 2018-08-09T08:53:59Z
Aligned Offset for ShuffleExternalSorter
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