Yongle Zhang created CASSANDRA-16264:
----------------------------------------

             Summary: During rolling upgrade from C* 2.0.0 to 2.1.0, upgraded 
node fails to gossip with seed
                 Key: CASSANDRA-16264
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16264
             Project: Cassandra
          Issue Type: Bug
            Reporter: Yongle Zhang


Steps to reproduce: 
 # Start a 2-node C* 2.0.0 cluster with one seed
 # upgrade the non-seed node to 2.1.0

Error stacktrace on upgraded node: 

 
{code:java}
ERROR [main] 2020-07-22 08:12:53,406 CassandraDaemon.java:474 - Exception 
encountered during startup
java.lang.RuntimeException: Unable to gossip with any seeds
  at org.apache.cassandra.gms.Gossiper.doShadowRound(Gossiper.java:1200) 
~[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:451)
 ~[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:667)
 ~[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.StorageService.initServer(StorageService.java:615) 
~[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.StorageService.initServer(StorageService.java:509) 
~[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:338) 
[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:457) 
[apache-cassandra-2.1.0.jar:2.1.0]
  at 
org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:546) 
[apache-cassandra-2.1.0.jar:2.1.0]

{code}
Analysis:

When a 2.1.0 node tries to make a connection with a 2.0.0 node, the 2.0.0 node 
will send an integer representing its version. After receiving this integer, 
the 2.1.0 node will compare it to the guessed version, and will update the 
guessed version and shutdown the connection if it is older than the guessed 
version, then it will make a second trial to connect to the 2.0.0 node. 

 

 

 



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