Github user advancedxy commented on the pull request:
https://github.com/apache/spark/pull/4783#issuecomment-76190779
@shivaram -- I followed the
[JDK-8024912](https://bugs.openjdk.java.net/browse/JDK-8024912),
[JDK-8024913](https://bugs.openjdk.java.net/browse/JDK-8024913) and
[JDK-7007564](https://bugs.openjdk.java.net/browse/JDK-7007564), It looks like
non-static field size is aligned to wordSize(8 bytes on 64bit JVM without
UseCompressedOops, 4bytes otherwise, verified by the Sizeof code I mentioned on
the jira). And the hotspot JVM wouldn't change that in short time.
This is the hotspot version, and I have no ideas about other version's of
JVM. But I think we can use this setting up for now just like we did with the
ALIGN_SIZE?
And this is what I get for now. If we (including others or some JVM
experts) can agree on that, I will update the code. So, waiting for others'
opinion now
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