Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/4783#issuecomment-76262495
@advancedxy -- Yeah it sounds good to me to use 4-byte shell size alignment
without CompressedOops and 8 bytes otherwise (we can wait to see if there are
other opinions). If we want to be extra careful we can put this inside a
`if(isHotspot)` check.
BTW it would be great if you can check if this is consistent across Java
1.6, 1.7, 1.8 HotSpot versions.
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