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https://issues.apache.org/jira/browse/ACCUMULO-227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175052#comment-13175052
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Keith Turner commented on ACCUMULO-227:
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Aaron,
By default Accumulo is a map (when configured w/ the versioning iterator). To
get the map behavior you mentioned w/ aggregation, I think you could put the
versioning iterator below the aggregating iterator. Then aggregation would
never see two identical keys.
Without the versioning iterator, if two identical key values exist in two map
file then the user will see both. This has nothing to do w/ the in memory map.
This change just makes the behavior when the Versioning iterator is removed
consistent.
There is one oddity when there are two identical keys, nondeterministic
behavior. If two files have the same key value and you have the versioning
iterator configured, then you may see different values for the same key at
different times. Eric suggested sorting on the value to make this
deterministic.
> Improve in memory map counts to provide cell level uniqueness for repeated
> columns in mutation
> -----------------------------------------------------------------------------------------------
>
> Key: ACCUMULO-227
> URL: https://issues.apache.org/jira/browse/ACCUMULO-227
> Project: Accumulo
> Issue Type: Improvement
> Components: tserver
> Reporter: John Vines
> Assignee: John Vines
> Fix For: 1.5.0
>
>
> Currently for isolation we only isolate mutations. This doesn't allow
> mutations with identical cells within it. We should increase the mutation
> counts to account for each individual cell instead of each mutation.
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