Eric Newton created ACCUMULO-906:
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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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