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From "Mubarak Seyed (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4720) Implement atomic update operations (checkAndPut, checkAndDelete) for REST client/server
Date Wed, 14 Dec 2011 08:12:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169164#comment-13169164
] 

Mubarak Seyed commented on HBASE-4720:
--------------------------------------

Stack,

Option 1:
If we send ?check=true then client can send value to check and value-to-check as part of URI
like

PUT or POST
/table/<row>/<column>:<qualifier> ?(/<check:true>) ?(/<value-to-check>)
?(/<timestamp>)
(with Put object as content)

Delete on RowResource uses only request-URI and there is no way to get CellSetModel (which
holds the content of Delete object, as part of checkAndDelete API). If we go by HTTP @Delete
method then how do we send the entity-body (content)? Ref: http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.7

Can we treat checkAndDelete as HTTP PUT or POST operation and send the Delete object content
as entity-body?

so, the request URI would look like

checkAndPut: PUT (or) POST /table/<row>/<column>:<qualifier> ?(/<checkandput:true>)
?(/<value-to-check>) ?(/<timestamp>)
checkAndDelete: PUT (or) POST /table/<row>/<column>:<qualifier> ?(/<checkanddelete:true>)
?(/<value-to-check>) ?(/<timestamp>)

we can make use of put or post in RowResource and refactor the put()/post() code to handle
both put/checkAndPut and delete/checkAndDelete.

Option 2:
If we dont want to refactor the RowResource code, we can create new resource (such as /checkandput
and /checkanddelete) then we can append the /table/<row>/... convention

                
> Implement atomic update operations (checkAndPut, checkAndDelete) for REST client/server

> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-4720
>                 URL: https://issues.apache.org/jira/browse/HBASE-4720
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Daniel Lord
>
> I have several large application/HBase clusters where an application node will occasionally
need to talk to HBase from a different cluster.  In order to help ensure some of my consistency
guarantees I have a sentinel table that is updated atomically as users interact with the system.
 This works quite well for the "regular" hbase client but the REST client does not implement
the checkAndPut and checkAndDelete operations.  This exposes the application to some race
conditions that have to be worked around.  It would be ideal if the same checkAndPut/checkAndDelete
operations could be supported by the REST client.

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