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https://issues.apache.org/jira/browse/HBASE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907328#action_12907328
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Jonathan Gray commented on HBASE-2406:
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Following commit of HBASE-1485, I think cell version semantics are basically
defined. You can update existing versions and you can write versions out of
order.
What is left is dealing with deletes. I think there is some consensus that
whether or not we eventually "fix" this issue (inserting behind deletes), it's
well beyond the scope of 0.90.
Since this JIRA deals with documentation, I suppose we should add a section to
the book about versions and then we can close this. JIRAs remain to deal with
the delete issue specifically.
Any volunteers?
> 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
>
>
> 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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