[jira] Updated: (HBASE-493) Write-If-Not-Modified-Since support

["Andrew Purtell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Purtell updated HBASE-493:
---------------------------------

    Status: Open  (was: Patch Available)

Cancelling stale patch. 

> Write-If-Not-Modified-Since support
> -----------------------------------
>
>                 Key: HBASE-493
>                 URL: https://issues.apache.org/jira/browse/HBASE-493
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: client, io, regionserver
>    Affects Versions: 0.21.0
>            Reporter: Chris Richard
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: HBASE-493.patch
>
>
> Write-If-Not-Modified-Since for optimistic concurrency control:
> Client retrieves cell (or row) and stores timestamp.
> Client writes to same cell (or row) and passes timestamp.
> If the cell's (or row's) latest timestamp matches the passed timestamp, the write succeeds. If the timestamps do not match, the write fails and the client is notified. The client must re-retrieve the cell/row to get the latest timestamp before attempting to write back.
> This behavior would be optional, if the client doesn't pass a timestamp to the write method, no modified check would be enforced.
> Note: blocked behind HBASE-489 due to requirement that client be able to access timestamp values.

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