Did you get any exceptions on decommission? Does CASSANDRA-5857 sound related at all? (1.2.4 is a few revs behind now and there have been a few fixes there, so and upgrade might not hurt).  

On Tue, Aug 27, 2013 at 5:53 PM, John Sanda <john.sanda@gmail.com> wrote:
Forgot to mention before, the host_id column is null for one of the rows. Running nodetool removenode on the other one failed. StorageService threw an exception because it could not find the host id (of the decommissioned node with the non-null host_id in system.peers).

On Tuesday, August 27, 2013, John Sanda wrote:
I had a 4 node cluster running C* 1.2.4. I am testing some client code for adding/removing nodes to/from the cluster. I decommissioned 3 nodes. I only have one node now; however, the system.peers table still has rows for two of the nodes that were decommissioned. nodetool status only reports the one remaining node.

Will it be a problem still having those decommissioned nodes in system.peers? And if so, what should be done to resolve it?

- John


- John