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From "Alex Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3759) Support joining in a distributed environment.
Date Wed, 13 Jun 2012 17:07:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294560#comment-13294560
] 

Alex Liu commented on LUCENE-3759:
----------------------------------

is there any performance concern?
                
> Support joining in a distributed environment.
> ---------------------------------------------
>
>                 Key: LUCENE-3759
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3759
>             Project: Lucene - Java
>          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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