[TEZ-2849] Implement Specific Workaround for JDK-8026049 & JDK-8073093

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.1-alpha
• Fix Version/s: 0.8.2
• Target Version/s: 0.8.2
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 22/Sep/15 19:59
• Updated: 18/May/16 04:57
• Resolved: 04/Nov/15 00:14

Description

The CPU performance overhead of the sort operation is tied to the JIT handling of the aliased byte buffers without an explicit alignment (i.e a byte[] buffer referenced as an IntBuffer).

https://bugs.openjdk.java.net/browse/JDK-8026049
+
https://bugs.openjdk.java.net/browse/JDK-8073093

Workaround that JIT limitation while keeping in mind the modern CPU micro-code optimizations around alignment.

http://lemire.me/blog/archives/2012/05/31/data-alignment-for-speed-myth-or-reality/

Issue Links

• requires: TEZ-1593 Refactor PipelinedSorter to remove all MMAP based ByteBuffer references