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From "Michael Gottesman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1090) Atomic Check And Save in HTable
Date Sat, 27 Dec 2008 04:51:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659307#action_12659307
] 

Michael Gottesman commented on HBASE-1090:
------------------------------------------

also, before I forget, I have not had a chance to run the unit test. I am using new computers
and for some reason the tests are failing (aka a bunch of tests that I did not touch), and
I am pretty sure it is due to problems I have had before (this seems eerily familiar ; p).
I can test it in a few days (I am traveling tonight) or if someone else could apply the patch
and run the tests, it would be great.

> 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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