[Hadoop-common-user] java.io.IOException: Could not obtain block:

I've not encountered an error like this, but here's some suggestions:

1. Try to make sure that your two node cluster is setup correctly.
Querying the web interface, using any of the included dfs utils (eg.
hadoop dfs -ls), or looking in your log directory may yield more useful
stack traces or errors.

2. Open up the source and check out the code around the stack trace.
This sucks, but hadoop is actually pretty easy to surf through in
Eclipse, and most classes are kept within a reasonable number of lines
of code and fairly readable.

3. Rip out the parts of Nutch you need and drop them in your project,
and forget about 0.19. This isn't ideal, but you have to remember that
this whole ecosystem is still forming and sometimes it makes sense to
rip stuff out and transplant it into your project rather than depending
on 2-3 classes from a project which you otherwise don't use.

Edmund,

Thanks for the advice. It turns out that it was the firewall running
on the second cluster node.

So I stopped that and all is working correctly. Now that I have the
second node working the way that it is supposed to probably, going to
bring another couple of nodes online.

Wish me luck:)

-John