[jira] Commented: (HBASE-2406) Define semantics of cell timestamps/versions

["Pranav Khaitan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906621#action_12906621 ] 

Pranav Khaitan commented on HBASE-2406:
---------------------------------------

Patch for this issue posted at https://review.cloudera.org/r/780/

> 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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