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From "Keith Turner (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-803) Add Reverse Logical Time as a Time Type
Date Tue, 16 Oct 2012 16:25:02 GMT


Keith Turner commented on ACCUMULO-803:

bq. You could do both count up and count down logical time on many different groups of keys
in the same tablet with only persisting one timestamp

That would work.  You can go up or down in a sparse manner.  Does not seem like plugins are
needed.  Are there other operations we want to support besides FIFO and FILO?  Seems operations
like multiplication, addition, modulo, and division would not be useful.  Randomizing the
timestamp could be accomplished on the client side.  Would be nice to have use cases for plugin
> Add Reverse Logical Time as a Time Type
> ---------------------------------------
>                 Key: ACCUMULO-803
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>    Affects Versions: 1.4.2
>            Reporter: Drew Farris
>            Assignee: Drew Farris
>            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
> 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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