incubator-accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Benson Margulies <>
Subject Re: 'Redundant' mutations
Date Thu, 09 Feb 2012 14:50:12 GMT
On Thu, Feb 9, 2012 at 9:47 AM, Aaron Cordova <> wrote:
> You get "a"
> By default tables are configured with a "versioning iterator" that filters out all but
the latest "version" of a key, meaning the key with the latest timestamp, which provides the
cleaning out of redundant keys that differ only in timestamp behavior you describe

I understood that the default was only to see the latest, but does
disk space remain consumed with older ones until something happens, or
does it clean out itself?
> On Feb 9, 2012, at 9:43 AM, Benson Margulies wrote:
>> At time 0, I make a Mutation with put("a", "b", "c");
>> At time 1, I do it again.
>> Do I get:
>> a) two copies of the same data with different timestamps?
>> b) an error?
>> c) something else?
>> If the idea I'm looking for is to end up with one item without doing a
>> scan each time to see if it's out there, is there a 'garbage
>> collection' cliche for cleaning out redundant items that differ only
>> in timestamp?

View raw message