Are there other HBase FAQs?
Why doesn't my remote java connection into my ec2 cluster work?
See Andrew's answer here, up on the user list: Remote Java client connection into EC2 instance.
When I build, why do I always get
Ignore it. Its not an error. It is officially ugly though.
Whats involved upgrading to HBase 0.90.x from 0.89.x or from 0.20.x?
This version of 0.90.x HBase can be started on data written by HBase 0.20.x or HBase 0.89.x. There is no need of a migration step. HBase 0.89.x and 0.90.x does write out the name of region directories differently -- it names them with a md5 hash of the region name rather than a jenkins hash -- so this means that once started, there is no going back to HBase 0.20.x.