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https://issues.apache.org/jira/browse/SOLR-8012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14732050#comment-14732050
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Shawn Heisey commented on SOLR-8012:
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Devil's advocate comment:
What if you have thousands of fields in your index, but you only requested
three of them? Do you want your shards returning all of those fields to the
merger, only to have virtually all of that information dropped before being
sent to the client?
> 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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