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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2406) Define semantics of cell timestamps/versions
Date Fri, 29 Oct 2010 23:53:23 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack updated HBASE-2406:

    Attachment: 2406.txt

Here is a section on hbase versions based on Bruno's article w/ some updates and a bit of
preamble on what hbase versions are about.

As per Brunos' article, it explains how timestamping works for get, scan, put, and delete.
 It has a section on limitiations.  It also explicitly answers the questions that todd raises
at head of this issue.

While I was at it, I added some docbook config. up in the pom and also removed the sample
illustrative article I'd added to show how we could do articles only in docbook. 

I also added a 'quick start' section at head of the book as well as other clean up.

> Define semantics of cell timestamps/versions
> --------------------------------------------
>                 Key: HBASE-2406
>                 URL: https://issues.apache.org/jira/browse/HBASE-2406
>             Project: HBase
>          Issue Type: Task
>          Components: documentation
>            Reporter: Todd Lipcon
>            Assignee: Pranav Khaitan
>            Priority: Critical
>             Fix For: 0.90.0
>         Attachments: 2406.txt, versions.html
> There is a lot of general confusion over the semantics of the cell timestamp. In particular,
a couple questions that often come up:
> - If multiple writes to a cell have the same timestamp, are all versions maintained or
just the last?
> - Is it OK to write cells in a non-increasing timestamp order?
> Let's discuss, figure out what semantics make sense, and then move towards (a) documentation,
(b) unit tests that prove we have those semantics.

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