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https://issues.apache.org/jira/browse/SOLR-8337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025241#comment-15025241
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Joel Bernstein commented on SOLR-8337:
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Patch adds a single *reduce()* method that returns a single Tuple, which is the
final reduction.
The *operate(Tuple)* method will be called for each Tuple that is read by the
*ReducerStream*.
The reduce() method will be called each time the group by key changes. This
will give the ReduceOperation a chance to finish the reduce algorithm and
return a single Tuple. The ReduceOperation will also clear it's internal memory
after each call to reduce() to prepare for the next Tuple grouping.
> Add ReduceOperation Interface
> -----------------------------
>
> Key: SOLR-8337
> URL: https://issues.apache.org/jira/browse/SOLR-8337
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
> Attachments: SOLR-8337.patch
>
>
> This is a very simple ticket to create new interface that extends the
> StreamOperation. The interface will be called the ReduceOperation.
> In the near future the ReducerStream will be changed to accept a
> ReduceOperation. This will allow users to pass in the specific reduce
> algorithm to the ReducerStream, making the ReducerStream much more powerful.
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