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From "Drew Farris (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-803) Add Reverse Logical Time as a Time Type
Date Thu, 11 Oct 2012 13:31:03 GMT
Drew Farris created ACCUMULO-803:
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             Summary: 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: 1.4.2
            Reporter: Drew Farris
            Assignee: Keith Turner
            Priority: Minor
         Attachments: ACCUMULO-803.patch

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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