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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9200) Sequences
Date Mon, 18 May 2015 17:03:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14548288#comment-14548288
] 

Jonathan Ellis commented on CASSANDRA-9200:
-------------------------------------------

... however, I don't think we should "hide" the CP-ness by adding e.g. auto-sequence PK on
insert.  If the sequence is exposed explicitly as a nextval call, I think the tradeoff is
more clear.

> Sequences
> ---------
>
>                 Key: CASSANDRA-9200
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9200
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>            Assignee: Robert Stupp
>             Fix For: 3.x
>
>
> UUIDs are usually the right choice for surrogate keys, but sometimes application constraints
dictate an increasing numeric value.
> We could do this by using LWT to reserve "blocks" of the sequence for each member of
the cluster, which would eliminate paxos contention at the cost of not being strictly increasing.
> PostgreSQL syntax: http://www.postgresql.org/docs/9.4/static/sql-createsequence.html



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