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https://issues.apache.org/jira/browse/KUDU-1945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17737547#comment-17737547
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ASF subversion and git services commented on KUDU-1945:
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Commit 1bdb0105b1ae64c167f32b67ee9da03825605d9c in kudu's branch
refs/heads/master from Abhishek Chennaka
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=1bdb0105b ]
KUDU-1945 Backup/restore for tables with auto incrementing columns
This patch adds the ability to backup and restore tables containing
auto-incrementing columns. A simple test case is also added to test
the functionaility.
Without this patch any attempt to
Backup a table with auto-incrementing column will fail with an error
message "auto_incrementing_id is a reserved column name" from
schema.cc.
Restoring a table with auto-incrementing column will result in the
same behavior as with the backup.
Change-Id: I929d54d22c1c938ee67fdda9f4c2bb68c028b4ec
Reviewed-on: http://gerrit.cloudera.org:8080/20084
Reviewed-by: Alexey Serbin <[email protected]>
Tested-by: Kudu Jenkins
> 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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