Runtian opened a new pull request, #2978:
URL: https://github.com/apache/cassandra/pull/2978

   
   
   ```
   Skip version check if an endpoint is dead state
   If the dead / left node is not skipped, sometimes a such node will cause the 
upgradeFromVersionSupplier to not able to return memoized data. Which will lead 
to thread serialization because all of them need to acquire the lock first. 
   
   ```
   
   The [Cassandra Jira](https://issues.apache.org/jira/browse/CASSANDRA-19187)
   
   


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