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https://issues.apache.org/jira/browse/CASSANDRA-11559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Lourie updated CASSANDRA-11559:
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Status: Patch Available (was: In Progress)
https://github.com/apache/cassandra/compare/trunk...alourie:CASSANDRA-11559#files_bucket
> Enhance node representation
> ---------------------------
>
> Key: CASSANDRA-11559
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11559
> Project: Cassandra
> Issue Type: Sub-task
> Components: Distributed Metadata
> Reporter: Paulo Motta
> Assignee: Alex Lourie
> Priority: Minor
>
> We currently represent nodes as {{InetAddress}} objects on {{TokenMetadata}},
> what causes difficulties when replacing a node with the same address (see
> CASSANDRA-8523 and CASSANDRA-9244).
> Since CASSANDRA-4120 we index hosts by {{UUID}} in gossip, so I think it's
> time to move that representation to {{TokenMetadata}}.
> I propose representing nodes as {{InetAddress, UUID}} pairs on
> {{TokenMetadata}}, encapsulated in a {{VirtualNode}} interface, so it will
> backward compatible with the current representation, while still allowing us
> to enhance it in the future with additional metadata (and improved vnode
> handling) if needed.
> This change will probably affect interfaces of internal classes like
> {{TokenMetadata}} and {{AbstractReplicationStrategy}}, so I'd like to hear
> from integrators and other developers if it's possible to change these
> without major hassle or if we need to wait until 4.0.
> Besides updating {{TokenMetadata}} and {{AbstractReplicationStrategy}} (and
> subclasses), we will also need to replace all {{InetAddress}} uses with
> {{VirtualNode.getEndpoint()}} calls on {{StorageService}} and related classes
> and tests. We would probably already be able to replace some
> {{TokenMetadata.getHostId(InetAddress endpoint)}} calls with
> {{VirtualNode.getHostId()}}.
> While we will still be dealing with {{InetAddress}} on {{StorageService}} in
> this initial stage, in the future I think we should pass {{VirtualNode}}
> instances around and only translate from {{VirtualNode}} to {{InetAddress}}
> in the network layer.
> Public interfaces like {{IEndpointSnitch}} will not be affected by this.
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