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https://issues.apache.org/jira/browse/ACCUMULO-906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532463#comment-13532463
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Billie Rinaldi commented on ACCUMULO-906:
-----------------------------------------
Setting "all" to true applies the Combiner to every column instead of just
specific columns. So, if you inserted more data:
{noformat}
> insert mammal cow ellie 1
> insert mammal cow ellie 1
> insert mammal cow ellie 1
> insert mammal cow nell 1
> insert mammal cow nell 1
> insert mammal man eric 1
{noformat}
and then scanned with all=true, you should get
{noformat}
mammal cow:ellie [] 3
mammal cow:nell [] 2
mammal man:eric [] 1
{noformat}
We don't currently support combining values across different columns.
> Combiners documention could be improved
> ---------------------------------------
>
> Key: ACCUMULO-906
> URL: https://issues.apache.org/jira/browse/ACCUMULO-906
> Project: Accumulo
> Issue Type: Bug
> Affects Versions: 1.4.1, 1.4.0, 1.4.2
> 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.
> But I just get this
> {noformat}
> mammal cow:ellie [] 1
> mammal cow:nell [] 1
> mammal man:eric [] 1
> {noformat}
> I can't get the combiner to come back with a sum of mammals or cows.
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