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From Steve Loughran <ste...@apache.org>
Subject Re: Hadoop Java Versions
Date Thu, 23 Jun 2011 12:49:58 GMT
On 22/06/2011 21:27, 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?

A colleague saw it, intermittent JVM crashes. Unless he's updated I 
can't say the problem has gone away.

> 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.

what's your HW setup? #cores/server, #servers, underlying OS?

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