"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? 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. On 6/14/11 5:16 PM, "Allen Wittenauer" <a...@apache.org> wrote: > >While we're looking at the wiki, could folks update >http://wiki.apache.org/hadoop/HadoopJavaVersions with whatever versions >of Hadoop they are using successfully? > >Thanks. > >P.S., yes, I'm thinking about upgrading ours. :p
