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From Adam Fuchs <>
Subject Re: upgrade from 1.3 to 1.4
Date Tue, 03 Jan 2012 17:43:50 GMT
Why not add the combiner (so that both are enabled) and then remove the
aggregator? The two iterators should be commutative and associative, so
results should be reasonable and compactions should be safe when both are
enabled in the tree.


On Tue, Jan 3, 2012 at 12:39 PM, Billie J Rinaldi <
> wrote:

> On Tuesday, January 3, 2012 11:51:19 AM, "Aaron Cordova" <
>> wrote:
> > Is it ok to disable the stringsummation aggregator and then enable the
> > summingcombiner through the shell? Should I take the table offline
> > first?
> If the table is quiet (i.e. not compacting), then it shouldn't be a
> problem to do the switch while it's online.  Queries might get unexpected
> results during the switch.  If you've removed the VersioningIterator from
> the table, then you could even make the change during compactions.
>  However, if there is versioning, there would be the possibility of it
> removing versions instead of aggregating during compactions.
> Billie

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