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Date: Wed, 13 Feb 2013 17:10:12 +0000 (UTC)
From: "Keith Turner (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (ACCUMULO-803) Add Reverse Logical Time as a
 Time Type
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    [ https://issues.apache.org/jira/browse/ACCUMULO-803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13577724#comment-13577724 ] 

Keith Turner commented on ACCUMULO-803:
---------------------------------------

Thought of two other things.  Needs to support the proxy.  Need to make sure recovery works properly.  This may be tricky to automatically test, but should at least try it manually.
                
> Add Reverse Logical Time as a Time Type
> ---------------------------------------
>
>                 Key: ACCUMULO-803
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-803
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>    Affects Versions: 1.5.0
>            Reporter: Drew Farris
>            Assignee: Drew Farris
>            Priority: Minor
>         Attachments: ACCUMULO-803.patch, ACCUMULO-803.patch, RLTest.java
>
>
> In a context where we are doing aggregation/combination of multiple values for a given key it may be useful to iterate over the values associated with that key in the order in which the mutations were applied (FIFO), instead of the FILO order that seems to occur when using {{TimeType.LOGICAL}}. 
> I encountered when implemeting a checkAndPut operation that would ensure that the previous value was expected before putting a new value. In this case, if the previous value was not as expected, the mutation would be ignored. 
> Perhaps it is useful in a general case?

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