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Date: Tue, 30 Dec 2008 11:53:44 -0800 (PST)
From: "Andrew Purtell (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1090) Atomic Check And Save in HTable
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    [ https://issues.apache.org/jira/browse/HBASE-1090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659913#action_12659913 ] 

Andrew Purtell commented on HBASE-1090:
---------------------------------------

I think you are thinking of the atomic increment and decrement stuff that jgray contributed in HBASE-803. 

> Atomic Check And Save in HTable
> -------------------------------
>
>                 Key: HBASE-1090
>                 URL: https://issues.apache.org/jira/browse/HBASE-1090
>             Project: Hadoop HBase
>          Issue Type: New Feature
>            Reporter: Michael Gottesman
>            Priority: Minor
>         Attachments: hbase-1090.patch
>
>
> Check And Save is a simple operation where one gives both a BatchUpdate with updates and a Map mapping columns to expected values (byte[] -> byte[]). The operation works as follows:
> 1. Server gets locks on row.
> 2. Server checks that the actual values of the specified columns match the given expected values
> 3. If False, return False, if True update the row
> 4. Unlock row.
> Pretty simple... but useful.
> Included in the attached patch are the necessary updates for HTable, HRegionServer, RegionServerInterface, and HRegion. I also added a small unit test to HTable where the test checks that checkAndSave succeeds when the expected values line up and fail when the values are different.

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