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https://issues.apache.org/jira/browse/HBASE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859895#action_12859895
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stack commented on HBASE-2406:
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We have our work cut out for us: "@kdpeterson HBase manually set timestamp
explained by XKCD (from http://xkcd.com/657/) http://twitpic.com/1hd437";
http://twitter.com/kdpeterson/status/12598874822 and "@kdpeterson Manually
setting the time stamp in HBase is like time travel. It stops making any sense
and intuitive is wrong." http://twitter.com/kdpeterson/status/12598514371
> Define semantics of cell timestamps
> -----------------------------------
>
> Key: HBASE-2406
> URL: https://issues.apache.org/jira/browse/HBASE-2406
> Project: Hadoop HBase
> Issue Type: Task
> Components: documentation
> Reporter: Todd Lipcon
> Fix For: 0.21.0
>
>
> 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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