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https://issues.apache.org/jira/browse/HBASE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12888465#action_12888465
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stack commented on HBASE-2406:
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Bruno at outerthought describes how it currently works, warts n'all:
http://outerthought.org/blog/blog/417-OTC.html
> Define semantics of cell timestamps
> -----------------------------------
>
> Key: HBASE-2406
> URL: https://issues.apache.org/jira/browse/HBASE-2406
> Project: HBase
> Issue Type: Task
> Components: documentation
> Reporter: Todd Lipcon
> Priority: Critical
> Fix For: 0.90.0
>
>
> 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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