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https://issues.apache.org/jira/browse/CASSANDRA-17100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict Elliott Smith updated CASSANDRA-17100:
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Epic Link: CASSANDRA-17089
> CEP-15: (C*) Unique Per-Node Id for (Time)UUID
> ----------------------------------------------
>
> Key: CASSANDRA-17100
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17100
> Project: Cassandra
> Issue Type: New Feature
> Components: Accord
> Reporter: Benedict Elliott Smith
> Priority: Normal
>
> Negotiate a unique and persistent id for each node on joining the cluster
> that is sufficiently compact to use for the node part of a v2, v6 or v8
> (Time)UUID, i.e. it should be at most 48 bits in length. In practice we
> should be able to target 7, 14 or 21 bits in length depending on cluster
> size, permitting more efficient vint encoding over the network and on disk.
> A seemingly simpler option for issuing UUID might be to use the NIC MAC
> address, but this assumes each C* process has a unique NIC, and that all
> nodes in the cluster are on the same network. This is likely often true, but
> may not be universally, so we may need a mechanism for issuing unique IDs
> when clashes occur, in which case it may be easier to just issue the most
> compact ID we can in the first place.
> Accord will use this value directly as part of its {{Timestamp}} which is
> very similar to a UUID but may have additional components. Accord may utilise
> this ID to uniquely identify the issuing node within the cluster, which the
> MAC address may not easily achieve as it may vary for the same logical node
> over time e.g. if the NIC is replaced - though a record of recent MAC
> addresses could be maintained.
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