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From "Chris Burroughs (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-10111) reconnecting snitch can bypass name check
Date Mon, 17 Aug 2015 22:18:46 GMT
Chris Burroughs created CASSANDRA-10111:

             Summary: reconnecting snitch can bypass name check
                 Key: CASSANDRA-10111
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: 2.0.x
            Reporter: Chris Burroughs

 * Two clusters: A & B
 * Both are two DC cluster
 * Both use GossipingPropertyFileSnitch with different listen_address/broadcast_address

A new node was added to cluster A with a broadcast_address of an existing node in cluster
B (due to an out of data DNS entry).  Cluster B  added all of the nodes from cluster A, somehow
bypassing the cluster name mismatch check for this nodes.  The first reference to cluster
A nodes in cluster B logs is when then were added:
 INFO [GossipStage:1] 2015-08-17 15:08:33,858 (line 983) Node / is
now part of the cluster

Cluster B nodes then tried to gossip to cluster A nodes, but cluster A kept them out with
'ClusterName mismatch'.  Cluster B however tried to send to send reads/writes to cluster A
and general mayhem ensued.

Obviously this is a Bad (TM) config that Should Not Be Done.  However, since the consequence
of crazy merged clusters are really bad (the reason there is the name mismatch check in the
first place) I think the hole is reasonable to plug.  I'm not sure exactly what the code path
is that skips the check in GossipDigestSynVerbHandler.

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