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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2406) Define semantics of cell timestamps/versions
Date Sat, 30 Oct 2010 00:07:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926509#action_12926509
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Jonathan Gray commented on HBASE-2406:
--------------------------------------

I read through about half of the doc so far.  Great work Stack!  Thanks for doing this.

> 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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