[jira] [Created] (CASSANDRA-8132) Save or stream hints to a safe place in node replacement

["Minh Do (JIRA)" <ji...@apache.org>]

Minh Do created CASSANDRA-8132:
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             Summary: Save or stream hints to a safe place in node replacement
                 Key: CASSANDRA-8132
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8132
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Minh Do
            Assignee: Minh Do
             Fix For: 2.1.1


Often, we need to replace a node with a new instance in the cloud environment where we have all nodes are still alive. To be safe without losing data, we usually make sure all hints are gone before we do this operation.

Replacement means we just want to shutdown C* process on a node and bring up another instance to take over that node's token.

However, if a node has a lot of stored hints, HintedHandofManager seems very slow to play the hints.  In our case, we tried to replace a node and had to wait for several days.

Since this is not a decommission, I am proposing that we have the same hints-streaming mechanism as in the decommission code.  Furthermore, there needs to be a cmd for NodeTool to trigger this.




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