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From "Michael Gottesman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1090) Atomic Check And Save in HTable
Date Tue, 30 Dec 2008 22:02:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Gottesman updated HBASE-1090:
-------------------------------------

    Attachment: hbase-1090v2.patch

version 2

> 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, hbase-1090v2.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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