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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-906) Combiners always combine by column family
Date Fri, 14 Dec 2012 15:38:12 GMT
Eric Newton created ACCUMULO-906:
------------------------------------

             Summary: Combiners always combine by column family
                 Key: ACCUMULO-906
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-906
             Project: Accumulo
          Issue Type: Bug
    Affects Versions: 1.4.2, 1.4.0, 1.4.1
            Reporter: Eric Newton
            Assignee: Eric Newton
            Priority: Blocker
             Fix For: 1.5.0, 1.4.3


Goal: sum all the values across all columns.

{noformat}
> createtable animal
> deleteiter -n vers -scan -minc -majc
> setiter -t animal -p 10 -scan -n sum -class org.apache.accumulo.core.iterators.user.SummingCombiner
SummingCombiner interprets Values as Longs and adds them together.  A variety of encodings
(variable length, fixed length, or string) are available
----------> set SummingCombiner parameter all, set to true to apply Combiner to every column,
otherwise leave blank. if true, columns option will be ignored.: true
----------> set SummingCombiner parameter columns, <col fam>[:<col qual>]{,<col
fam>[:<col qual>]} escape non-alphanum chars using %<hex>.: 
----------> set SummingCombiner parameter lossy, if true, failed decodes are ignored. Otherwise
combiner will error on failed decodes (default false): <TRUE|FALSE>: 
----------> set SummingCombiner parameter type, <VARLEN|FIXEDLEN|STRING|fullClassName>:
STRING
> insert mammal cow ellie 1
> insert mammal cow nell  1
> insert mammal man eric  1
> scan
expected: mammal dontcare : dontcare 3
{noformat}

Where "dontcare" can come back with anything; I just don't care.

I can't get the combiner to come back with a sum of mammals or cows.


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