Need to sync up the off heap changes with master. This should be mostly stable now, unless we add more changes.

SHA-1s that need to be ported over

c769cb3b9465695267c374efc25851765d0e0b56 ISPN-8517
35fd0a7d9aed3ec457a756ecfdc104a2a1a3804f ISPN-8500
3f5bf9e613b31481cb6f8f41dca0dad590e8db12 ISPN-8534
a39de0f0acc8d9557b869ab444b89fe211610a50 ISPN-8545
53a373370860b1ed4ea5abc706a81df2a06a0dba ISPN-8550
dccf4064751270c5976095ba123c7ce38d0c0dd5 ISPN-8435
0b9a48ca18fc9aa380d7f2dafa7c45aaab2f432a ISPN-8435
4824f7e08430cc423db569485e379382fbc7fda5 ISPN-8435