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https://issues.apache.org/jira/browse/KUDU-1945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17721841#comment-17721841
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ASF subversion and git services commented on KUDU-1945:
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Commit 7089733c1d79931ef7411415f46429bf26d37a7e in kudu's branch
refs/heads/gh-pages from Marton Greber
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=7089733c1 ]
KUDU-1945 Update faq with non-unique PK
Change-Id: I3e588ffb84907deed7cfc8d6be088b09f2b54322
Reviewed-on: http://gerrit.cloudera.org:8080/19860
Reviewed-by: Abhishek Chennaka <[email protected]>
Reviewed-by: Wenzhe Zhou <[email protected]>
Tested-by: Abhishek Chennaka <[email protected]>
> Support generation of surrogate primary keys (or tables with no PK)
> -------------------------------------------------------------------
>
> Key: KUDU-1945
> URL: https://issues.apache.org/jira/browse/KUDU-1945
> Project: Kudu
> Issue Type: New Feature
> Components: client, master, tablet
> Reporter: Todd Lipcon
> Priority: Major
> Labels: roadmap-candidate
>
> Many use cases have data where there is no "natural" primary key. For
> example, a web log use case mostly cares about partitioning and not about
> precise sorting by timestamp, and timestamps themselves are not necessarily
> unique. Rather than forcing users to come up with their own surrogate primary
> keys, Kudu should support some kind of "auto_increment" equivalent which
> generates primary keys on insertion. Alternatively, Kudu could support tables
> which are partitioned but not internally sorted.
> The advantages would be:
> - Kudu can pick primary keys on insertion to guarantee that there is no
> compaction required on the table (eg always assign a new key higher than any
> existing key in the local tablet). This can improve write throughput
> substantially, especially compared to naive PK generation schemes that a user
> might pick such as UUID, which would generate a uniform random-insert
> workload (worst case for performance)
> - Make Kudu easier to use for such use cases (no extra client code necessary)
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