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https://issues.apache.org/jira/browse/SOLR-3073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196228#comment-13196228
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Martijn van Groningen commented on SOLR-3073:
---------------------------------------------
The client reading the final response (end user) isn't aware of how ids are
exposed between shards.
A client might however use the internal api (group.distibuted.first /
group.distibuted.second). I think since this is an internal api which isn't
meant to be used by end users, the last patch can be committed.
> Distributed Grouping fails if the uniqueKey is a UUID
> -----------------------------------------------------
>
> Key: SOLR-3073
> URL: https://issues.apache.org/jira/browse/SOLR-3073
> Project: Solr
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: Devon Krisman
> Priority: Minor
> Fix For: 3.6
>
> Attachments: SOLR-3073-3x.patch, SOLR-3073-3x.patch
>
>
> Attempting to use distributed grouping (using a StrField as the
> group.fieldname) with a UUID as the uniqueKey results in an error because the
> classname (java.util.UUID) is prepended to the field value during the second
> phase of the grouping.
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