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https://issues.apache.org/jira/browse/LUCENE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15050253#comment-15050253
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Ashish Datta commented on LUCENE-3759:
--------------------------------------
Hi guys,
Is this issue being addressed in a future release etc. ?
In order that Solr/Lucene be able to horizontally shard and yet give a unified
view to queries that need to access joined data, I think this will be a BIG hit
!
I saw a similar thing in the Mongo system where a 'queryrouter' did the same
job of sending parallel query requests to multiple servers with individual
shards and returned a consistent result. Though the two tools are entirely
different, if the data/facets distribution and shard keying is known, this does
not seem unsurmountable in Lucene.
Would be really interested and eager to provide a use case in an actual
production scenario where the lack of this feature is causing some grief ! and
increasing the query coding to compensate for it.
> Support joining in a distributed environment.
> ---------------------------------------------
>
> Key: LUCENE-3759
> URL: https://issues.apache.org/jira/browse/LUCENE-3759
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/join
> Reporter: Martijn van Groningen
>
> Add two more methods in JoinUtil to support joining in a distributed manner.
> * Method to retrieve all from values.
> * Method to create a TermsQuery based on a set of from terms.
> With these two methods distributed joining can be supported following these
> steps:
> # Retrieve from values from each shard
> # Merge the retrieved from values.
> # Create a TermsQuery based on the merged from terms and send this query to
> all shards.
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