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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-803) Add Reverse Logical Time as a Time Type
Date Sat, 30 Mar 2013 03:55:16 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh Elser updated ACCUMULO-803:
--------------------------------

    Affects Version/s:     (was: 1.5.0)
    
> 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
>            Reporter: Drew Farris
>            Assignee: Drew Farris
>            Priority: Minor
>             Fix For: 1.6.0
>
>         Attachments: ACCUMULO-803-3.patch, 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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