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From "Andrei Dragomir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-493) Write-If-Not-Modified-Since support
Date Tue, 27 Apr 2010 10:21:33 GMT

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

Andrei Dragomir updated HBASE-493:

    Attachment: HBASE-493.v2.patch

Latest version

> 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, HBASE-493.v2.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

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