The README file says Accumulo is tested with hadoop version 0.20.2. The shell script bin/config.sh actually checks the Hadoop version and says that Accumulo requires Hadoop version 0.20.x. I've tested Accumulo with Hadoop 1.0 and didn't see much difference.
We're thinking to upgrade our Hadoop cluster to 0.23, so I'm wondering whether there's any problem to run Accumulo on top of it. Thanks, Lin
