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From William Oberman <>
Subject nodetool hanging
Date Wed, 27 Apr 2011 16:02:14 GMT
I've figured this out, but to help those out there who don't want to waste
an hour like me debugging a hung "nodetool ring" command:  JMX opens a
second random port, so you either have to disable any firewalls between the
machine running nodetool and the cassandra instance (or there are
complicated workaround that I didn't try, overriding some class and a new
non-RMI based version of JMX that is sun/oracle only).

I'm in EC2, and I'm using security groups + iptables for 2x firewall
redundancy.  Now some of my instances are using just security groups.  It's
a bummer, but not terrible.  For anyone who can't just open the firewall, I


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