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https://issues.apache.org/jira/browse/SOLR-3073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated SOLR-3073:
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Attachment: SOLR-3073-3x.patch
Thanks for noticing this issue!
I'm not sure if the response writers were ever meant to serialize UUID
instances. So maybe this is a general response writing bug?
I attached an alternative fix for this issue. Instead of invoking
FieldType#toObject method it invokes FieldType#toExternal method in the
TopGroupsResultTransformer class. I think this is a better approach for
distributed grouping since there is no overhead of creating an UUID object
(UUID#fromString). For distributed grouping we can just threat all ids as
strings.
> 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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