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https://issues.apache.org/jira/browse/CASSANDRA-6108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040431#comment-14040431
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Jonathan Ellis commented on CASSANDRA-6108:
-------------------------------------------

Sylvain's idea was to have the clients request an  ID from the server on 
initial connection, which would let us get away with a 16 bit id.  64k 
simultaneous clients per cluster seems reasonable.  (IDs could be reused after 
disconnect.)

> Create timeid64 type
> --------------------
>
>                 Key: CASSANDRA-6108
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6108
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 2.1.1
>
>
> As discussed in CASSANDRA-6106, we could create a 64-bit type with 48 bits of 
> timestamp and 16 bites of unique coordinator id.  This would give us a 
> unique-per-cluster value that could be used as a more compact replacement for 
> many TimeUUID uses.



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