Arijit created CASSANDRA-13308:
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             Summary: Hint files not being deleted on nodetool decommission
                 Key: CASSANDRA-13308
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13308
             Project: Cassandra
          Issue Type: Bug
          Components: Streaming and Messaging
         Environment: Using Cassandra version 3.0.9
            Reporter: Arijit
            Priority: Minor


How to reproduce the issue I'm seeing:
Shut down Cassandra on one node of the cluster and wait until we accumulate a 
ton of hints. Start Cassandra on the node and immediately run "nodetool 
decommission" on it.

The node streams its replicas and marks itself has DECOMMISSIONED, but other 
nodes do not seem to see this message. "nodetool status" shows the 
decommissioned node in state "UL", and Cassandra logs show that this is because 
gossip tasks on nodes are blocked. Jstack shows that the tasks are blocked on 
hints dispatch (I can provide traces if this is not obvious). Because the 
cluster is large and there are a lot of hints, this is taking a while. 

On inspecting "/var/lib/cassandra/hints" on the nodes, I see a bunch of hint 
files for the decommissioned node. Documentation seems to suggest that these 
hints should be deleted during "nodetool decommission".

When I manually delete hint files on the nodes, the hints dispatcher threads 
throw a bunch of exceptions and the decommissioned node is now in state "DL" 
(perhaps it missed some gossip messages?). The node is still in my 
"system.peers" table

Restarting Cassandra on all nodes after this step does not fix the issue (the 
node remains in the peers table). In fact, after this point the decommissioned 
node is in state "DN"



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