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https://issues.apache.org/jira/browse/SOLR-8012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735344#comment-14735344
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Chirag Gupta commented on SOLR-8012:
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Thanks Shalin, I'm saying exactly what you explained. :)
> Field mapping portion of "fl" should be handled in the merger node
> ------------------------------------------------------------------
>
> Key: SOLR-8012
> URL: https://issues.apache.org/jira/browse/SOLR-8012
> Project: Solr
> Issue Type: Improvement
> Components: search, SearchComponents - other, SolrCloud
> Affects Versions: 5.1
> Reporter: Chirag Gupta
> Labels: starter
>
> Today "fl" is used for
> a) filtering the fields and
> b) mapping the field names to alternate names.
> we should optimize the network traffic by not passing the field mappings to
> all the nodes and run on the node which is fanning-out and merging the
> request.
> This impacts the network in the cases where there are 100s of shards to send
> and the field mapping list is huge
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