On Jun 22, 2011, at 1:27 PM, Scott Carey wrote:
> "Problems have been reported with Hadoop, the 64-bit JVM and Compressed
> Object References (the -XX:+UseCompressedOops option), so use of that
> option is discouraged."
>
> I think the above is dated. It also lacks critical information. What JVM
> and OS version was the problem seen?
That is definitely dated. Those were problems from 18 and 19.
>
> CompressedOops had several issues prior to Jre 6u20, and a few minor ones
> were fixed in u21. FWIW, I now exclusively use 64 bit w/ CompressedOops
> for all Hadoop and non-Hadoop apps and have seen no issues. It is the
> default in 6u24 and 6u25 on a 64 bit JVM.
We use compressedoops on 21 every-so-often as well.
Feel free to edit that whole section. :)
Thanks!
